On Jurassic and Cretaceous fossils from North-East Greenland. 48;) 



63. Aporrhais sp. (II). 



In the same concretions, which contained the previous species, 

 are a number of other specimens, which in all probability belong 

 to a different species of the genus Aporrhais. 



All the whorls are strongly arched. No true ridge occurs, but 

 on the other hand a very strong spiral, which lies somewhat above 

 the middle of the whorls; it is bounded on both sides — especially 

 below — by a depression. The outer lip forms a large, broad wing, 

 the outer boundary of which cannot be seen on the available speci- 

 mens. Otherwise the sculpture consists of a large number of fine 

 spirals, which seem however to be somewhat coarser and denser 

 than in the preceding species, just as the lines of growth are much 

 more distinct. I have not succeeded in referring these specimens 

 either to any known species. 



(U. Lytoceras polare n. sp. 

 PI. XXXV, fig. 9. 



I have been unable to refer a fairly well-preserved specimen of 

 a Lytoceras to any species known to me. 



The whorls slightly overlapping, almost circular in section (to 

 a breadth of 15 mm corresponds a height of 125 mm, measured in 

 the middle line); its greatest breadth lying a little nearer the umbilicus 

 than the external side. The greatest diameter of the specimen 42 mm 

 with a corresponding width of umbilicus of 16 mm. On the surface 

 somewhat distant, slightly curved, raised transverse lines at fairly 

 equal distances from one another; between them indications of other 

 dense, line lines, somewhat variable in size. — The suture-line in 

 part distinct, strongly toothed, with a very narrow siphonal saddle, 

 and the characteristic, cross-shaped, antisiphonal lobe; auxiliary lobes 

 wanting. The external lobe and 1st lateral lobe almost equally deep 

 (probably the specimen is not fully developed). 



It will be seen from the above, that this species is one of the 

 typical Fimbriates. In form it greatly resembles L. Sacya Forb., but 

 the suture-line and sculpture of the latter are very different, as it 

 belongs to the subgenus (iaudruceras Gross, (emend. Kossmat). A 

 more nearly related form is L. ezoense Yabk, but this species also 

 has a different sculpture. 



Distribution. North -East Greenland: in a limestone concre- 

 tion found as boulder on the north side of Vesterdalen at Danmarks 

 Havn (1 spec). 



XLV. 35 



