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Text-fig. 9. Revultex impression of a siliceous concretion NM L 31967. A – an assemblage of three specimens of Barrandicella cf. tarda (PERNER, 1903); a – indeterminate early shell (? Barrandicella sp.), b – Mytoconula sp., ×...... B – Mytoconula sp., obligue left lateral view of an early shell just after landing on the Barrandicella surface, with a narrow flat rim of initial teleoconch shell, probably pressed down by sediment, ×......; C – the same, obligue left lateral view, ×......; D – the same, oblique right posterolateral view showing increments in the early shell, ×....... Dobrotivá F., PrahaŠárka. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 9. Revultex impression of a siliceous concretion NM L 31967. A – an assemblage of three specimens of Barrandicella cf. tarda (PERNER, 1903); a – indeterminate early shell (? Barrandicella sp.), b – Mytoconula sp., ×...... B – Mytoconula sp., obligue left lateral view of an early shell just after landing on the Barrandicella surface, with a narrow flat rim of initial teleoconch shell, probably pressed down by sediment, ×......; C – the same, obligue left lateral view, ×......; D – the same, oblique right posterolateral view showing increments in the early shell, ×....... Dobrotivá F., PrahaŠárka.

Text-fig. 8. Mytoconula vonkai sp. n. Specimen NM L 38914, internal mould with patches of shell. A – apical view, ×......; B – oblique posterior view showing radial ribs on internal mould, ×......; C – anteri- or part with a large patch of shell with irregular incremental structures, ×......; D – left lateral view, ×......;. Dobrotivá F., Malé Přílepy. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 8. Mytoconula vonkai sp. n. Specimen NM L 38914, internal mould with patches of shell. A – apical view, ×......; B – oblique posterior view showing radial ribs on internal mould, ×......; C – anteri- or part with a large patch of shell with irregular incremental structures, ×......; D – left lateral view, ×......;. Dobrotivá F., Malé Přílepy.

Text-fig. 3. Patelliconus primulus (BARRANDE in PERNER, 1903). Specimen NM L 39616, internal mould. A – apical view, B – oblique left posterolateral view, both ×......; C – right posterolateral view showing the second and third successive positions of muscle band (arrowed), located on top of each elevation (= in the deepest place of the wide depression of shell interior at the periphery of a flat ramp), ×....... Šárka F., Volduchy – Díly near Rokycany. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 3. Patelliconus primulus (BARRANDE in PERNER, 1903). Specimen NM L 39616, internal mould. A – apical view, B – oblique left posterolateral view, both ×......; C – right posterolateral view showing the second and third successive positions of muscle band (arrowed), located on top of each elevation (= in the deepest place of the wide depression of shell interior at the periphery of a flat ramp), ×....... Šárka F., Volduchy – Díly near Rokycany.

Text-fig. 1. Patelliconus primulus (BARRANDE in PERNER, 1903). The holotype, NM L 8425. A – apical view, B – left lateral view, ×......; C – fragment of shell with weak unequal and irregular collabral growth structures near the posterior margin, ×...... Šárka F., Osek near Rokycany. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 1. Patelliconus primulus (BARRANDE in PERNER, 1903). The holotype, NM L 8425. A – apical view, B – left lateral view, ×......; C – fragment of shell with weak unequal and irregular collabral growth structures near the posterior margin, ×...... Šárka F., Osek near Rokycany.

Text-fig. 5. Mytoconula vonkai sp. n. The holotype NM L 31983, internal mould. A – apical, B – right apical and right antero-lateral views, both with visible series of muscle scars in two raised zones, ×......;. Note the two long divergent scar zones in A. Dobrotivá F., Mýto near Holoubkov. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 5. Mytoconula vonkai sp. n. The holotype NM L 31983, internal mould. A – apical, B – right apical and right antero-lateral views, both with visible series of muscle scars in two raised zones, ×......;. Note the two long divergent scar zones in A. Dobrotivá F., Mýto near Holoubkov.

Text-fig. 6. Mytoconula vonkai sp. n. Specimen NM L 31984, internal mould. A – apical, B – right lateral views, ×...... and ×....... Note the outline of an indeterminate object on which the larva settled. This specimen, embedded in a siliceous concretion, lied closely near the holotype NM L 38914. Dobrotivá F., Mýto near Holoubkov. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 6. Mytoconula vonkai sp. n. Specimen NM L 31984, internal mould. A – apical, B – right lateral views, ×...... and ×....... Note the outline of an indeterminate object on which the larva settled. This specimen, embedded in a siliceous concretion, lied closely near the holotype NM L 38914. Dobrotivá F., Mýto near Holoubkov.

Text-fig. 7. Mytoconula vonkai sp. n. Counterpart of specimen NM L 3876c, apical view showing weathered radial structures; A – ×......, B – ×....... Dobrotivá F., Malé Přílepy. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 7. Mytoconula vonkai sp. n. Counterpart of specimen NM L 3876c, apical view showing weathered radial structures; A – ×......, B – ×....... Dobrotivá F., Malé Přílepy.

Text-fig. 5. Mytoconula vonkai sp. n. The holotype NM L 31983, internal mould. A – apical, B – right apical and right antero-lateral views, both with visible series of muscle scars in two raised zones, ×......;. Note the two long divergent scar zones in A. Dobrotivá F., Mýto near Holoubkov. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 4. Patelliconus primulus (BARRANDE in PERNER, 1903). Specimen MHBR 2418, revultex impression. A – apical view showing the early shell and earliest stages of teleoconch. Note patches of shell with irregular incremental structures; B – left lateral view; C – oblique left apicolateral view showing finely ribbed early shell and patches of shell in earliest stages of teleoconch, all ×....... Šárka F., Osek near Rokycany. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 4. Patelliconus primulus (BARRANDE in PERNER, 1903). Specimen MHBR 2418, revultex impression. A – apical view showing the early shell and earliest stages of teleoconch. Note patches of shell with irregular incremental structures; B – left lateral view; C – oblique left apicolateral view showing finely ribbed early shell and patches of shell in earliest stages of teleoconch, all ×....... Šárka F., Osek near Rokycany.

Text-fig. 2. Patelliconus primulus (BARRANDE in PERNER, 1903). Specimen NM L 5891. A – apical view, B – right lateral view, × ........ Šárka F., Osek near Rokycany. in Patelliconus Horný, 1961 And Mytoconula Gen. N. (Mollusca, Tergomya) From The Ordovician Of Perunica

Text-fig. 2. Patelliconus primulus (BARRANDE in PERNER, 1903). Specimen NM L 5891. A – apical view, B – right lateral view, × ........ Šárka F., Osek near Rokycany.