Il() I.AMKLLIBRANCHIATA. 



The ribbing may also be subject to some variation, in regard to denseness and strength. 

 This variety is common at West Greenland; apart from the "Ingolf" stations mentioned 

 re I have seen specimens from the following localities: 



Julianehaab. 



Mouth of Ameralik Fjord (as a short, convex, rather densely ribbed form). 



66°49' X. L., 56°28' W. L 235 fm., sand and ooze. 4.4/ C. 



Disko Bay 65 - 



Quite a number of the localities which Posselt notes from West Greenland under Astarte 

 crenata Gray (Medd. 0111 Gronland, XXIII, 189S, p. 64), also refer probably to the variety submquilatera. 

 — The largest specimens are 30 "'"'. long. 



At Jan Mayen, in addition to at the "Ingolf St. 115, it has been taken by the Danish 

 Expedition of 1900 at a depth of 55 fm., on ooze mixed with coarser material. The Austrian Polar 

 Station took it on the north side of the island, at a depth of 75 — 95 fm. (Becher I.e. p. 70). The 

 maximum length is 30""". 



From Denmark Strait there is a single valve from 64.°^' N. L-, 27°4o' W. L., 426 fm. (W. of 

 Iceland). 



V a r. crebricostata M c. Andr. &. Forbes. 

 PL IV, figs. 5 f and g. 



Astarte crebricostata Mc. Andr. & Forbes, Ann. Mag. Nat. Hist. XIX, 1847, p. 98, PI. 9, fig.4; Forbes 

 & Han ley, Brit. Moll. I, 1853, P- 45°i PI- 3°) n &- 9i Sower by, Thes. Conchyl. II, 1855, p. 

 780, PI. 167, fig. 10; Reeve, Conchol. Icon. XIX, 1874, Astarte, sp. 10, PI. 2, fig. 10; Sars, 

 Moll. Reg. Arct. Norv., 1S78, p. 54, PI. 5, fig. 7. 



In this variety the ribbing is very like that in the foregoing, but the shell is in general more 

 triangular or oval-cordiform and has the umbones moved more in front. It is however very close to 

 the var. subaquilatera and cannot always be kept separate from this. 



It occurs at North and East Iceland, whence we have it from the following localities: 



Skagestrands Bugt 119 fm. 5 spec. 



66°i-'X. L., i8°i 3 'W. L 52 - 1 — 



Husavik in E. by S 47 — 58 - 1 — 



Thistil Fjordr 50 - , clay with many stones. 4 & 85 valves. 



66 3 2'N.E., i 5 °i 5 W. L. 75- 3 valves. 



Bakkafjordr 52—43 - , clay mixed with sand. 1 spec. 



Seydisfjordr 50—20 - 1 — 



38—14 - , mud. 



'i- 



Hie largest specimen is 31 mm . long. 



