337 



Astarte crenata Gray. 



f. typica 



Astarte crenata Gray, Reeve, Conchol. Icon. XIX, 1874, 



sp. 9. — Л.оЫопда Sowerby, Thes. Conchyl. II, 1855, p. 781, 



PI. 167, Fig. 19. 



The shell is oval, more or less convex, with numerous 



(ca. 50) comparatively low concentric ribs which disappear 



on the posterior part of the shell ; the periostracum is light, 



yellowish. 



1900. Hurry-Inlet 50 fms. Clay with stones Numerous specim. 



1900. Cape Hope 121 — Clay with stones 3 specimens. 



1900. Cape Tobin 120 — 1 — 



1891—92. 72°24'N. 19°42' W. 130 — 3 - (2 empty). 



1900. 72°ol'N. 20°32V2W... 124 - Clay 1 — (empty). 



1891— 92. 72° 53' N. 20° 36' W. 96 - 6 — 



1891 — 92. 73°24'N. 20° W. . . 106 — 2 — 



1900. SE. of Sabine-Island... . 110 — Fine clay with stones and gravel 



10 spec, and some empty valves. 



The largest specimens are of a length of 28 mm. 



In its typical shape it is a rather characteristic form, but 

 it is subjected to great variations ^). The ribs may become 

 fewer and more conspicuous , and all three dimensions are 

 subject to considerable changings which will be seen from the 

 following measures : 



The height The breadth 



Length. Height, in % of the Breadth, in % of the 



length. length, 



mm. mm. mm. 



Hurry-Inlet 23 П'б 76-1 10-5 45*7 



Cape Hope 23-5 17-5 74-5 11-25 479 



SE. of Sabine-Island 23*5 18-2 774 12-5 53*2 

 _ _ 26-5 21-5 81-1 12 45-3 



Hägg has set up the variety incostata (1. с p. 37, Taf. I, Fig. 11 — 12) for 

 some especially short and ventricous specimens. Our Museum possesses 

 from Umanak in West-Greenland, from 250 fms., a similar form also 

 with slightly developed and very closely arranged ribs. 



22* 



