A. E. VerriJl — Mollusca of the New England Coast. 205 



sculpture consists of very numerous radiating striae, which are decus- 

 sated by fine and close, raised, regularly concentric lines of growth 

 of about the same size as the radii on the u])per 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 ofli* abruptly at fii'st, near the apex, and then 

 slo]ies regularly to the posterior margin, with a nearly straight, or 

 but slightly convex outline. The side-slopes ai"e 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 disc broad, semicircular, with the lateral angles prolonged 

 backward. 



Propilidium elegans Verriii, 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 appeai'ance 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 



