568 Karl A. Grönwall. 



The ventral valves which I refer to Sp. supramosquensis, closely 

 agree, as shown by the figures and the brief description given below, 

 with the earlier figurings of Sp. supramosquensis ; the one detail 

 which can, proximately, give rise to any doubt is that of the dimen- 

 sions. Nikitin's figures give a length of 31 and 37 mm., and Schell- 

 wien's text-figures give 28 and 47 mm., but as no scale-measure- 

 ment is given for any of these figurings, we are probably entitled 

 to consider them as drawn to natural size. The specimens given 

 by WiMAN attain a height of only 16 mm The North-east Greenland spe- 

 cimens, as a rule, have larger dimensions; as, however, the anterior 

 margin is defective in every instance, the length can only approxi- 

 mately be determined, this being, for the six specimens, 72, 60, 50, 

 45, 35 and 31 mm. Sp. Fritschi and Sp. Nikiiini, on the other hand, 

 attain dimensions more nearly in agreement with the specimens 

 from Greenland, as Schellwien gives for the first-mentioned a great- 

 est observed length of 55 mm. and Wiman mentions a specimen 

 from Cape Fanshave (Hinlopen Strait) Spitzbergen, 68 mm. in length. 

 In the case of Sp. Nikitini, the length of the largest specimen figured 

 amounts to 53 mm. 



As regards form, the North-east Greenland specimens agree л'егу 

 well with the illustrations given of the species, and, in this matter, 

 too, it can be observed that younger specimens present a greater 

 width than length (in the case of Sp. Nikitini, the opposite appears 

 to be the case); in the oldest specimens, the width is, probably, 

 only slightly in excess of the length, while, in the younger speci- 

 mens, the proportion between width and length can rise to 8:7 

 (Schellwien's text-figure 8 gives width : length 32 : 22). The greatest 

 width of the shell lies approximately just between the anterior mar- 

 gin of the shell and the hinge-line; the width of the hinge-line 

 amounts probably to about two-thirds of the entire width of the 

 shell. The umbo is pointed and incurved, and projects considerably 

 beyond the hinge-line. In consequence of the defectiveness of the 

 specimen, no details can be given of the structure of the cardinal 

 area and of the relation between the hinge-line and the lateral 

 margins of the shell, a relation which might, possibly, afford fur- 

 ther characteristic features for the determination of the species. 



N:o 8. Spirifer Fritschi Schellwien. 



For synonyms see Tschernyschew 1902, p. 156; Wiman 1914, 

 p. 48. 



In spite of the damaged state of the specimen, I consider that 

 I ought to refer to this species a Spirifer, found on the shore at the 

 Mallemukfjæld {N:o Hi), in a boulder of the fine-grained reddish 



