4i)(t J. P. J- Ravn. 



The most complete specimen has the following dimensions: 

 diameter 21 mm; greatest height of the whorl 9 mm, thickness 8 - 5 mm; 

 width of the umbilicus (5mm; distance between the external edges 2mm. 



In sculpture the species described resembles C. Jason Rein., but 

 the whorls are lower and thicker; further, nodes at the umbilical 

 edge are practically wanting. It resembles more a shell from Swistowo 

 (Gouv. Rjasan), which Lahusen (1. c, PI. <>, fig. 8) has figured under 

 the name of C. Gowerianum Sow. To judge from the figure, however, 

 this shell has a considerably wider umbilicus and the transverse 

 section of the whorl is more hexagonal; further, the row of nodes 

 on the sides lies here more to the middle of the flanks. On the 

 other hand, there is fairly good agreement between the sutnre-line 

 in the Greenland species and in C. (ioioerianum, which Lahusen 

 (1. c, PI. 7, lig. 1) ligures; but this latter is somewhat more finely 

 dentated, which is perhaps due however to its belonging to an older 

 specimen. Agreement is also shown in the fact, among others, that 

 the first lateral lobe is not deeper than the external lobe, as is 

 usually the case in the genus Cosmoceras. 



Distribution. North-East Greenland: in the loose-lying, 

 brownish sandstone, found at 50 m above the sea on Store Koldewey 

 Island down from "Trsekpasset" (8 spec). 



70. Kepplerites Tychonis n. sp. 

 PI. XXXVII, fig. 1. 



Large, discoidal shell with fairly wide umbilicus. The whorls 

 growing very slowly, greatly overlapping; but the last whorl becoming 

 gradually less and less so. Height of the inner whorls almost the 

 same as their thickness; the height of the order on the other hand 

 greater. Edge of the umbilicus specially well-marked, rounded. 

 The flanks but slightly arched. The external side evenly rounded, 

 but distinctly flattened on the innermost whorls, without external 

 furrow. The sculpture on the outer whorls in the form of very 

 numerous, very sharp ribs, originally directed strongly backwards, 

 but already over the edge of the umbilicus inclining slightly forwards, 

 dividing into several branches a little above this and forming flat 

 arches directed forwards over the external portion. — The suture-line 

 unusually strongly dentated with broad saddles and narrow lobes. 

 The external lobe deep and narrow, divided by a very projecting 

 median saddle. The external saddle extremely broad and very deeply 

 incised. The first lateral lobe a little deeper than the external lobe, 

 trilobed. The two lateral saddles broad, but much smaller than the 

 external saddle. The second lateral lobe much shorter than the 

 first lateral lobe. Auxiliarv lobes and saddles small and indistinct. 



