Fig. 1 in The Original Published Description Of An Embryonic Apparatus From The Orbitolinidae (Foraminifera) (Lower Cretaceous Of Borneo) With A Brief Commentary On The Age Of Orbitolinid Occurrences In Borneo

Fig. 1 Palorbitolina lenticularis (Blumenbach) from the Lower Cretaceous of Borneo (a-b) and south-eastern France (c-e). a-b transverse section of megalospheric embryo (from Martin, 1890, pl. XXV, fig. 18; b modified: light red = protoconch; light orange = periembryonic ring or zone). c transverse section of the megalospheric embryo (from Schroeder, 1963, pl. 24, fig. 4). d view of cone base, e view of cone surface, f Side view (from Blumenbach, 1805, pl. 80, figs. 5-6, 2, without scale).