A, E. Verrill— Mollusca of the New England Coast. 205 
sculpture consists of very numerous radiating strie, which are decus- 
sated by fine and close, raised, regularly concentric lines of growth 
of about the same size as the radii on the upper portion, where the 
shell is minutely cancellated, but on the lower part of the shell the 
concentric lines become larger and more distant, and have the form 
of regular raised cinguli; the intervals between these, which are two 
or three times as wide as the ridges, are crossed by the much finer 
and closer radiating lines, which do not produce a regular cancella- 
ted appearance on this part. Both the radiating and longitudinal 
lines are so fine as scarcely to be visible without a lens. Internally 
the surface is nearly smooth and lustrous, and the external sculpture 
shows through the substance of the shell. In the apex there is a 
minute transverse lamina, forming a small flattened tube. 
The anterior slope of the shell, seen in profile, is broadly rounded ; 
the posterior slope falls off abruptly at first, near the apex, and then 
slopes regularly to the posterior margin, with a nearly straight, or 
but slightly convex outline. The side-slopes are steep, regularly 
and slightly convex. 
Length, 5™™; breadth, 3™™; height, 2™™. 
Station. 2096, N. lat. 39° 22’ 20", W. long. 70° 52’ 20’, in 1451 
fathoms (No. 35,174). One living specimen. 
The animal has well developed, moderately stout, blunt tentacles ; 
frontal dise broad, semicircular, with the lateral angles prolonged 
backward. 
Propilidium elegans Verrill, sp. nov. 
Shell small, very thin and fragile, translucent bluish white, rather 
depressed, elongated-elliptical, with the recurved apex situated at 
about the posterior third. The nuclear whorl is very minute, 
smooth, glassy, compressed, strongly involute and turned a little to 
the left, forming a complete whorl, visible in a side view. The 
whole surface, under the microscope, has the appearance of a very 
fine shagreen. This is produced by very minute, short, wavy, raised 
lines, which are mostly arranged in zigzag or in herring-bone style; 
in some parts the two sets of lines, running obliquely, cross each 
other at nearly right angles; on other portions one or both sets are 
replaced by minute punctations, or granulations. This sculpture is 
visible only under a strong lens or with the compound microscope. 
The internal lamina or septum is narrow, crescent-shaped, situa- 
ted behind and some little distance below the extreme apex, and not 
