A. E. Verrill— Catalogue of Marine Mollusca. 581 
Variety, abyssorum (M. Sars). 
Pecten abyssorum Loyén; G. O. Sars, op. cit., p. 22, pl. 2, figs. 6, a-c. 
PLATE XLII, FIGURE 21. 
The variety abyssorwm differs only in being smoother, with the 
scales more or less obsolete; both forms occur together. 
South of Martha’s Vineyard this species has been taken in consid- 
erable numbers, and at thirty stations it was living and attached to 
various objects, above the bottom, but chiefly to the gorgonian coral, 
Acanella Normani V., which is very abundant in this region. This 
shell occurred, living, at all depths, from 100 to 506 fathoms. It was 
particularly abundant at station 894, in 365 fathoms, and at 1029, in 
458 fathoms. Dead valves were taken in 64 to 100 fathoms. 
The halibut fishermen of Gloucester, Mass., have given many speci- 
mens of this species to the U.S. Fish Commission. These were taken 
on the fishing banks off Nova Scotia, and on the Grand Bank, where 
it mostly occurs adhering to gorgonian corals: Primnoa reseda, 
Paragorgia arborea, Acanella Normani, Keratoisis ornata V., ete. 
It is often gregarious. 
Arctic Ocean, generally ; Greenland ; Iceland. Northern Norway 
south to France, Portugal, Madeira, and the Mediterranean. West 
Patagonia (t. Jeffreys). 
Peeten. Grénlandicus Sowerby, 1845. 
G. O. Sars, op. cit., p. 23, pl. 2, figs. 4, a—c. 
Gulf of St. Lawrence! (coll. Whiteaves). Arctic Ocean; Green- 
land; Spitzbergen; Lapland; northern Norway. N. of Scotland , 
W. of Ireland; off the Bay of Biscay, in 358 to 630 fathoms,— 
Jeffreys. 
Pecten Hoskynsi Forbes. 
Pecten Hoskynsi Forbes, Rep. Brit. Assoc., for 1843, pp. 188, 192, 1844 (description 
very short and indefinite). 
Wyville Thomson, Depths of the Sea, p. 465 (wood-cut, 79, no description). 
Pecten imbrifer Loven, Ind. Moll. Scand. Oecid. [p. 31], 1846 (description). 
Amussium Hoskynsi Jeffreys, Proc. Zool. Soc. London, p. 562, 1879. 
PLATE XLIV, FIGURE 11. 
Variety, pustulosus Verrill 
Pecten pustulosus Verrill, Amer. Journ. Sci., vy, p. 14, 1873; Trans. Conn. Acad., iii, 
p. 50 (description). 
Pecten Hoskynsi G. O. Sars, op. cit., p. 20, pl. 2, figs. 1, a-d, 1878. 
