426 A. FE. Verrill—Mollusca of the New England Coast. 
apex; it is thickened and partially filled up within. A slightly 
elevated ridge runs from the anterior end of the opening to the front 
edge of the shell, but is scarcely larger than the other ribs. The 
sculpture consists of about forty rounded, moderately elevated, nod- 
ulous, radiating ribs, with an alternating series of similar but smaller 
ribs on the lower half. The surface is covered with concentric, 
raised ‘lines, which are nearly as prominent as the radii, producing a 
cancellated structure and forming the small, rounded nodules where 
they cross. The internal septum is highly developed, large, strong 
and tubular, extending down in front farther than the foramen, with 
narrow lateral ridges extending nearly to the front edge of the shell. 
The edge of the shell is thin and slightly crenulated by the ribs. 
Length, 10™"; greatest breadth, 7"; height, 5"™; anterior edge 
to apex, 8™"; posterior edge to apex, 4:5"; length of foramen, 
16". 
One dead specimen was taken at station 2222, N. lat. 39° 03’ 15”, 
W. long. 70° 50’ 45”, in 1,537 fathoms, gray ooze, with pebbles, con- 
cretions and cinders. 
This species differs from P. noachina in being much less elevated, 
with the sides not flattened; in having the apex less prominent and 
farther back ; in the distinctly and rather coarsely cancellated struc- 
ture; and in having a broader and more fusiform foramen, situated 
more anteriorly and not extending so far toward the apex; the inter- 
nal septum is larger and more flattened and prolongations extend 
from its anterior edges nearly to the anterior edge of the shell. It 
seems to be very distinct from all the species described by Watson, 
Jeffreys, and Dall. 
Cocculina reticulata Verrill, sp. nov. 
Shell small, high, with a short-elliptical aperture, slightly flattened 
at the sides, but well-rounded in front and behind. The vertex is 
near the center, but the apex curves strongly backward, with a 
minute, smooth, prominent, spiral, incurved nucleus, not distinetly 
turned to either side. The posterior slope is concave and steep, 
owing to the incurvature of the apex; the anterior slope is longer 
and convex, especially toward the summit. The surface is finely and 
regularly reticulated by radiating and concentric raised lines of nearly 
equal size, scarcely visible without a lens. The radiating lines may 
be a little stronger on the sides. Color pale yellowish white. 
Length of an ordinary specimen, 2°6""; breadth, 1°8""; height, 
mm. 
