K 



LAIMlCLLUiKANClIIATA. 117 

 ^ 



V a 1". ill flat a H a g g. 

 PL I\', figs. 5 h and i. 

 ^Is/aric crciiafa Gray var. iiiflala Hagg, Arkiv for Zoologi, Bd. 2, Nr. 2, 1904, p. 37, I'l. I, figs. 4 — 6; 

 Jensen, Medd. oni Gronland, XXIX, 1909, p. 338. 



The shell is ventricose, approximating to the obliquely square-, with the upper and lower 

 margins almost parallel, the anterior end short, rounded, the posterior end truncate; the concentric ribs 

 in general rather numerous and strong, sometimes however less promiueut or even \anishiug on a 

 larger or smaller part of the shell (very rareh' even quite wanting, so that the shell oul\' shows a 

 fine striation). Periostracum yellow or brownish-yellow. 



It is a small form; 1 ha\'e not seen any specimen larger than 19""". 



Some measurements will show its limits of variation, from the obloug-trapeziform to almost 



quadratic, as also the more or less ventricose. 



Height Breadth 



Len^tli Height 2 — Breadth 



Length Length 



19 ""'\ 14.5 "'"\ 76.3 °/o 10 """. 52.6 °/o 



16.5 - 11.75 - 71.2 - 9.2 - 55.8 - 



15-25- 12 - 78.7 - 8.5 - 55.7 - 



15 - II - 73.3 - 7.3 - 487 - 



The number of ribs may rise to ca. 40 and fall to ca. 24 or even fewer, as the umbonal region 

 is frequently withotit folds; quite smooth specimens, as mentioned, may also occur. In small speci- 

 mens the ribs are frequently sharp, almost as in the following variety. 



This variety has been taken at the following places at East Greenland by Danish Expeditions: 



Forsblads Fjord ca. 50 fm., clay with stones. 5 spec. 



— — 90 — 50 - , clay with stones. Numerous spec. 



74°i7' N. L., 15^20' W. L 127 - , clay with stones. 2 spec. 



and by the Swedish Expedition of 1900 at: 



72°25' N. L., I7°56 W. L ca. 160 fm., stones and sand. 7 spec. 



Mouth of Franz Josefs Fjord 106— 158''2 - , mud. i — 



and S. of Jan May en by the Danish Expedition of 1891 at: 



7o°2i N. L., 8°25' W. L i6o fm., clay. 2 spec, (empty). 



I presume that it was this variety, of which the Austrian Station took 3 specimens on the 

 north side of Jan Mayen, at a depth of 75— 95fm.; E. Becher determined them as Astarte sulcata 

 d. C. (Osterr. Polarst. Jan Mayen, III, 1886, p. 71), but the latter is a warm-water form and the present 

 variety has some resemblance to it. 



Var. amticostata Jeffreys. 

 PI. IV, figs. 5 k, 1 and m. 

 Astarte acuficostata Jeffreys M.S., Friele, Nyt Mag. f. Naturvidensk. 23 Bd., 1877, 3 Hft, p. i; ibid. 

 24 Bd., 1879, p. 223; Jahrb. Deutsch. Malacozool. Gesellsch. 6 Bd., 1879, p. 267, PI. 4, fig. 8; 



