] 
' 
582 AL EL Werrill— Catalogue of Marine Mollusca, 
PLATE XLII, FIGURES 22, 22a. 
The original specimens of var. pustulosus V. were from south of 
George’s Bank, 430 fathoms, and Gulf of Maine, 150 fathoms, 1872. 
It was afterwards dredged by us, in 1877, in the Gulf of Maine, 115 
fathoms, and off Nova Scotia, in 190 fathoms, associated with the 
non-pustulose form, 
South of Martha’s Vineyard it occurred at stations 876, 880, 881, 
894, 947, 1038, in 120 to 365 fathoms, but only sparingly, and mostly 
dead. 
Greenland; Spitzbergen; Jan Mayen I.; Nova Zembla.* North- 
ern Norway to the Azores and Mediterranean, in deep water, 30 to 
650 fathoms. 
Although this species is referred to Amussium by Mr. Jeffreys, 
our specimens do not have the internal ribs, regarded as the special 
character of this genus. 
Amussium fenestratum (Forbes) Jeffreys. 
Jeffreys, Proce. Zool. Soc. London, 1879, p. 561. 
Pecten fenestratus Forbes, Rep. Brit. Assoc., for 1843, pp. 146, 192, 1844. 
Verrill, Proc. Nat. Mus,, iii, p. 403, Jan., 1881 (description). 
Pecten incequisculptus Tiberi (t. Jeffreys). 
The upper valve is elegantly decussated, the lower one is concen- 
trically lamellose. The upper valve is variously colored with beauti- 
ful tints of red, purple, brown and yellow, usually mottled. 
This elegant species has been dredged, living, at several stations 
off Martha’s Vineyard, in 86 to 310 fathoms. It was most numerous 
at stations 949 and 1040, in 100 and in 93 fathoms. 
It occurs on the European coasts, off Portugal, and in the Mediter- 
ranean Sea; from 50 to 250 fathoms; a variety from 2435 fathoms 
(t. Jeffreys). 
Avicula hirundo (Linné). 
Avicula hirundo Jeffreys, Brit. Conch., ii, p. 99, pl. 3, fig. 1; v, pl. 26. 
Variety, nitida Verrill. 
Avicula hirundo? var. nitida Verrill, Amer. Journ. Sci., xx, p. 392, Nov., 1880; 
Proc. U. 8S. Nat. Mus., iii, p. 402, Jan., 1881. 
PLATE LVIII, FIGURE 43. 
Some of our largest specimens agree well with the European forms 
figured by Jeffreys, and are conspicuously scaly. The largest are 
about 50"™ in the greatest diameter. 
