A. EF. Verrit— Mollusca of the New England Coast. 425 
the opposite direction on the lateral and inner surfaces; the transverse 
riblets are most elevated on the upper sides of the whorls, where they 
rise into small, thin lamelle; they also form similar lamelle on the 
inner and lower surfaces; the revolving lines are most conspicuous 
around the periphery ; minute but distinctly raised lines of growth 
also cross the intervals between the riblets. In a front view of the 
base the shell appears umbilicated and the upper whorls can be 
partially seen within the umbilicus. Color silvery white, slightly 
iridescent. 
Length (including only the three last whorls), 5"; breadth, 4™™; 
diameter of aperture, 1°6™™, 
Station 2229, in 1,423 fathoms, one dead but fresh specimen. (No. 
44,648). 
This singular shell bears no resemblance to any other known from 
this region. The soft parts and operculum being unknown, it is 
referred to this genus only provisionally, but its form and the pearly 
structure of the shell indicate that this is probably its proper place. 
Margarita, sp. nov. 
A broken specimen of a large and handsome species was taken at 
station 2265, in 70 fathoms, off Chesapeake Bay. The shell is mod- 
erately elevated, with rather convex whorls and a narrowly canalicu- 
late suture. The umbilicus is deep and moderately large, crenulated 
within by several spiral ribs. On the outer and lower surfaces of the 
whorls there are several sharply cut, elevated spiral cinguli, with deep 
furrows between. These are crossed by strong, oblique, raised lines 
of growth, which produce small nodules on the upper ones, aud above 
the shoulder take the form of oblique riblets, ranning down, from the 
suture. The upper whorls are broken off. 
Puncturella abyssicola Verrill, sp. nov. 
Shell moderately large, elliptical or ovate in outline, a little nar- 
rowed anteriorly, evenly convex along the sides, and rounded poste- 
riorly, moderately elevated, with the apex small, not very prominent, 
acute and curved backward and inward, situated a little behind the 
middle. The posterior slope is at first a little concave, owing to the 
position of the beak; the anterior slope is gently convex. The 
foramen is elongated fusiform, broadest in the middle, tapering both 
ways to acute points, but most acute anteriorly; its posterior end 
does not reach the vertex, and terminates some distance from the 
