434 A. E. Verrill—Mollusca of the New England Coast. 
dorsal margin is nearly straight and slopes more rapidly than the an- 
terior. The sculpture consists of slightly raised but very evident 
concentric undulations, which, like their concave intervals, are cov- 
ered with very fine lines of growth. The radial sculpture consists of 
the anterior and posterior undulations already referred to, and of 
the thin, raised, radiating lines on the posterior area, above described. 
The hinge consists of a small, somewhat spoon-shaped cartilage-plate, 
free at the end, projecting inward nearly at right angles to the mar- 
gin, and supporting a small, somewhat triangular cartilage-pit. 
From the posterior margin of this plate aslightly developed, support- 
ing rib, or buttress runs downward and backward for a short distance. 
A well-defined, narrow, incised notch extends at right angles from 
the hinge-margin into the center of the beak, just in front of the 
cartilage-plate. The hinge-margin itself is very thin. The inner 
surface of the shell is smooth, but wavy, and the muscular scars are 
indistinct. The epidermis is very thin, tinged with rusty brown 
toward the margins, showing lines of growth; it is slightly rough- 
ened and wrinkled along the posterior radii. Color, pale grayish white. 
Length, 13"; height, 10"; thickness, about 5°5™™, 
Station 2,234, N. lat. 39° 09’, W. long. 72° 03’ 15”, in 816 fathoms 
(No. 44,840), 
This species bears some resemblance to P. papyracea, but it is 
a narrower and more elongated shell, with the posterior end more 
produced, and with concentric and radiating undulations not seen in 
the latter. The cartilage-plate is smaller, and the supporting rib 
much less developed and more oblique than in P. papyracea. 
Pecchiolia granulifera Verrill, sp. nov. 
Shell small, thin, delicate, somewhat three lobed or triangular-cor- 
date, with the anterior and posterior ends a little produced and ob- 
tusely rounded, while the ventral margin is more produced and more 
broadly rounded; the dorsal margin is gently convex behind the beak, 
and decidedly concave in front of it. The beak is a little prominent, 
acute, and turned strongly forward. The umbos are rather promi- 
nent, and a rounded, ill-defined ridge runs to the postero-ventral mar- 
gin. The whole surface is closely covered with very small, rough 
eranules, to which minute grains of sand and foraminifera frequently 
adhere. On the anterior half there are also thin, feebly marked, 
raised radiating lines, more or less obscured by the granules ; 
anteriorly these become more distinct. Internally the shell is smooth 
and pearly, but covered with minute white specks. The hinge-margin 
