FIG. 13 in Turonian-Santonian echinoids from Egypt

FIG. 13. — Comparison of Petalobrissus djelfensis (Thomas & Gauthier, 1889) from the Coniacian-Santonian of Abu Roash and Wadi Dakhl (filled quadrangles, dashed line) and Petalobrissus waltheri (Gauthier, 1900) from the Coniacian-Santonian of Abu Roash and Wadi Dakhl (empty quadrangles, solid line). The scatter plots show the relation between test length (L) and each of test width (W), test height (H), length of petal I or V (LI), number of pore pairs in petal I or V (NI), length of petal II or IV (LII), number of pore pairs in petal II or IV (NII), length of petal III (LIII), and number of pore pairs in petal III (NIII).