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396 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
LAMELLIBRANCHIATA. 
Poromya granulata (Nyst) Forbes & Hanley. 
G. O. Sars, op. cit., p. 90, figs. 6 a, b.—Verrill, Trans. Conn. Acad., v, pl. 44, 
figs. 3, 4. 
Several adult living examples of this shell were dredged in 1872 by Dr. 
A.S. Packard and Mr. C. Cooke, on the Coast Survey steamer “ Bache”, 
in the Gulf of Maine, in 150 fathoms, mud. This season it was taken at 
station 865, in 65 fathoms. It has not previously been recorded as 
American. ; 
In form and size it somewhat resembles Thracia myopsis, but is easily 
distinguished by the small granules scattered over the exterior, and by 
the peculiar hinge, very different from that of Thracia. The right valve 
has a prominent, recurved, cardinal tooth. On the European coast it 
ranges from the Lofoden Islands to the Mediterranean, in deep water. 
Poromya rotundata Jeffreys. 
Annals and Mag. Nat. Hist., Dec., 1876, p. 494 (Valorous Expedition, Mol- 
lusea). 
Shell rounded, thin, translucent, pearly within. External surface 
closely covered with small, rounded, obtuse granules, arranged mostly 
in close quincunx, and distinctly forming radiating lines, but in some 
parts appearing to be also in concentric lines. The narrow intervals 
between these lines of granules show the iridescent surface of the shell. 
These granules give a shagreen-like appearance to the shell. The gran- 
ules show through on the inside, giving a finely tessellated appearance. 
The shell is but little longer than broad, convex; ventral and anterior 
edges evenly rounded; posterior dorsal edge a little sloping, and form- 
ing an obtusely rounded angle where it meets the curvature of the pos- 
terior end. Hinge of right valve with a prominent conical tooth, fitting 
into a corresponding pit in the left valve. 
South of Martha’s Vineyard, stations 865 and 871, 65 to 115 fathoms, 
living; North Atlantic, 1,450 fathoms (Jeitreys). 
Lyonsiella abyssicola M. Sars; Friele. 
Pecchiolia abyssicola G. O. Sars, Remarkable Forms Anim. Life, i, p. 25, pl. 3, 
figs. 21-43; Moll. Reg. Arct. Norv., p. 108, pl. 20, figs. 5 a-d. 
A few good living specimens of this interesting addition to the Ameri- 
can fauna were dredged by our party this season, south of Martha’s 
Vineyard and Newport, in 192 to 500 fathoms, fine, compact sand and 
mud (stations 869, 880, 891, 892, 894). 
Lyonsiella gemma Veirill, sp. nov. “ 
Shell small, iridescent, white, with raised radii, broad-oval, widest 
and broadly rounded anteriorly, expanded and broadly rounded ven- 
trally, posterior end short, narrowed, and tapered to an obtuse point. 
The beak is subcentral, but a little nearer the anterior end, prominent, 
inflated, strongly curved inward and forward. Dorsal margin abruptly 
incurved opposite the beaks and decidedly expanded and excurved in 
