A. E. Verrill — Mollusca of the Neio England Coast. 441 



nearly parallel with it, though longer and more broadly rounded, 

 passing insensibly into the curvature of the ventral margin ; the en- 

 tire margin is flat, beveled, and perfectly plain, with a simple but 

 distinctly angulated inner rim. Externally the shell, when fresh, is 

 covered with a thick, lamellose, and fringed, light yellowish brown 

 epidermis ; over the central portion the epidermal processes are long, 

 thin, and hair-like, and arranged in radiating lines; toward the mar- 

 gin, especially ventrally and posteriorly, they become long, flat, thin 

 and deeply lacerate Or fringed at the end ; on the umbos the processes 

 become small and ciliated with a distinct radial ai-rangement. 



Beneath the epidermis the shell is everywhere covered with pretty 

 regular concentric undulations, formed by thin, rather sharp, raised 

 lines, separated by regular concave intervals ; anteriorly the ridges 

 become less evident and very close; small, but distinct, radiating 

 striae cross the ridges over the central parts of the shell and are deeper 

 or incised in crossing the summits of the ridges ; anteriorly the 

 radiating stria? entirely disappear; toward the posterior end they be- 

 come stronger and on the jjosterior area they are gradually replaced 

 by elevated radii which in crossing the concentric lines produce a 

 distinctly granulated appearance. 



The inner surface is nearly smooth and somewhat lus|,rous, but 

 sometimes minutely radially striated. The muscular scars are small, 

 but distinct. 



Length of the largest specimens, including epidermis, 22""" ; with- 

 out the epidermis, 19"™ ; height from beak to ventral margin, 17'""' ; 

 length of dorsal margin, 9™™ ; transverse breadth, 10""". 



Station 2228, in 1,582 fathoms, two living specimens (No. 44,822) ; 

 and station 2221, in 1,525 fathorns. One dead specimen (No. 40,498.) 



This shell is larger, more oblique, and has a thinner hinge-plate 

 than the form described and figured by Jeflreys. Whether it be 

 identical with the original fossil shell, described by Brocchi, may be 

 questionable. 



Limopsis plana Verrill, sp. nov. 



Shell rather large for the genus, broad, moderately compressed, 

 decidedly oblique, with a thin, straight hinge-margin and a wide, 

 elongated fusiform ligamental area, interrupted in the middle by a 

 large, triangular cartilage-pit. The straight dorsal margin is less 

 than one-fifth the circumference of the shell, and does not extend so 

 far forward as the convexly rounded anterior margin ; the ventral 

 margin is regularly rounded and considerably produced backward ; 



