By Jeletzky J.A., Kemper E.

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Additional info for Comparative paleontology and stratigraphy of Valanginian Polyptychitinae and Simbirskitinae in Sverdrup Basin (Arctic Canada) and Lower Saxony Basin (NW Germany)

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Costellatus Koenen 1909 (PI. IX, figs. 1, 2) P. infundibulum Koenen 1909 (Pl. 111, figs. 1, 2) and P. robustus Koenen 1909 (Pl. 111, figs. 3, 4) The same appears to be true of P. subgravesi Spath 1924 and P. pyritosus Spath 1924, which were originally figured by Pavlow (in Pavlow and Lamplugh, 1892). Yet another example is provided by the quasi-cadicone high Boreal Pseudoeuryptychites Jeletzky 1986 described later in this paper. All of the above mentioned, figured specimens from Northwest Europe exhibit a basically polyptychitinid sculpture with clearly expressed senile features.

1, fig. 5 * i 964 1 968 1976 Polyptychites iPropolyptyehifes)emslundensis Kernper, p. 24, PI. I , fig. la, lb; PI. 2, fig. 5. Polyptychites (Prupolypt~chites)einslurtdensis Kemper, PI. 12, figs. la, I b. Pofyptyehites ((Popolypfychites)emsiunllensis Kemper, p. 34, PI. 12, figs. la, lb. Figure 13. Adult external suture lines of Paratoiiia kemperi Casey, 1973 and Neocraspedites semilaevis (Koenen, 1902). a. Two advanced adult sutures of the holotype of P. kemperi reproduced in PI. 7, fig. 6 {E there for the locality data).

The sculpture is coarse. The contrast between the feebly developed bullae and coarse ribs is especially prominent. The adapical half of the last preserved whorl has 8 to 9 primary elements, which can hardly be named bullae. These elements are slightly inclined backwards. They give rise to 2 to 3 coarse supplementary ribs. Solitary, intercalated secondaries, which extend addorsally without any subdivision, occur between these simple bundles, The supplementary ribs are also bent backwards on the flank but acquire short forward bends on the venter.

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