434 .1. E. Verrill — Molliisca 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 a slightly 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, IS""'" ; height, 10""" ; thickness, about S'S™"". 



Station 2,234, N. lat. 39° 09', VV. 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 cartil'age-plate is smaller, and the supporting rib 

 much less developed and more oblique than in P. papyracea. 



Pecchiolia granulifera VeirUi, sp. no v. 



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 ]trominent, 

 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 

 granules, to which minute grains of sand and foraminifera fre<iuently 

 adhere. On the anterior lialf there are also thin, feebly marked, 

 raised ra<liating 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 



