I.AM ELLIBRANCHIATA. T g 



Nor can I believe, that the shells of this species stated to have been taken off the west coast of 

 France, 748 — 1262 m. ("Princesse Alice") and in the Bay of Biscay, 400 m. ("Caudan") were "fresh" 

 — unfortunately, the authors say nothing as to the condition of the shells -- though Locard makes 

 the following statement regarding P.islandicus : "C'est, comme on le sait, nne espece particulierement 

 septentrionale, qui ne vient jusque clans nos regions qu'a la condition de se propager en eaux 

 profondes". 1 ) 



Pecten islandicus is not a particularly high-arctic species; it lives in greatest quantity, forming 

 whole banks of shells, at Finmarken, North Iceland and Sonth-West Greenland as well as on the 

 fishing banks of Nova Scotia and Newfoundland, whereas it occurs much more sparsely atSpitzbergen 2 ). 

 Morch also remarks, that it does not grow so large in the high north 3). As mentioned, it attains a 

 considerable size even so far south as S. W. Iceland, where the bottom-temperature in August 

 amounted to 9.3 C. 



Pecten aratus Gmelin. 



PI. I, figs. 5 a— e. 



Pecten aratus Gmelin, Linn. Syst. Nat. ed. 13, 1788, p. 3327. — Pecten sulcatus Jeffreys, 

 Brit. Conchol. II, 1863, p. 64; Proc. Zool. Soc, 1879, P- 557- ~' ^ ) '' c ' /t '' / aratus Sars, Moll. Reg. Arct. 

 Norv. 1878, p. 17, Tab. 2, fig. 3. 



The "Ingolf" Expedition has taken this species at: 



St. 98. W. of Iceland 13S fm. 5.9 C. A number of valves. 



- 97- - - 45° " 5-5° - 1 ri §' ht valve - 



- 89. - - 310 - 8.4 CI - 1 spec. &. 1 left valve. 



- 9. S. W. - 295 - 5.8 - n valves. 



- 10. - - — 788 - 3.5 - 1 small spec, (height 6 



- 85. - - 170 - 2 valves. 



- 55- S. E. - 316 - 5.9 - 2 spec. 



At Iceland and the Faeroes — where it has not been known hitherto - it has also been 

 taken at the following places by Danish expeditions: 



64°42' N. L., 27°43' W. L 426 fm. 6° C. 1 spec. 



63°i 5 ' — 22^23' - 170-114 - 1 



63°o5' 2Q°7 r 293 - 2 & 13 valves. 



63 : 'i2.5' - 20°o6' — 268 - ca. 2.» spec. 



6i°i5' 9 35' ca. 475 - 1 spec. 



The specimens to hand are rather variable both in form and sculpture. As a rule the height is 

 somewhat greater than the length, but the two dimensions may be almost equal. In consequence of 

 this the circumference is variable, the lower contour forming sometimes a part of an oblique oval, some- 

 times an almost perfect arc of a circle. The number of the primary, stronger ribs is extremely variable 



M Campagne du "Caudan", par R. Koehler, 1S96, p. 207. 



2 ) Torell: Spitsbergen Molluskfauna, [859, p. 124. 



3) Catal. des Moll, du Spitzberg, p. 27. Ann. Soc. Mai. de Belgique, IV, [869. 



