LEPETELLA. 75 



P. compression JEFFR., P. Z. S. 1882, p. 674, t. 50, f. 8. 

 P. ELE<;AXS Yerrill. Unfigured. 



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, situated behind and 

 some little distance below the extreme apex, and not forming an 

 elongated channel ; it is distinctly visible from the outside, owing to 

 the translucency of the shell. (Verrill.') 



Length 3*5, breadth 2*5, alt. 1 mill. 



Off Chesapeake Bay, 1395 fms. 



P. elegans VERRILL, Trans. Conn. Acad. vi, p. 205. 



The animal has a short, broad ovate foot, subtruncate in front, 

 with the edge frilled. Frontal disk rather large, broad semicircular 

 or crescent-shaped, with the angles extending back in a large obtuse 

 lobe on each side. Buccal area semicircular ; mouth surrounded 

 with four convex elevations, one before and one behind it, and one 

 on each side. Tentacles slender, tapering, acute. Eyes apparently 

 wanting. No cirri on mantle. (Verrill.) 



Subfamily LEPETELLINJE Dall. 

 Genus LEPETELLA Yerrill, 1880. 



Lepetella YERRILL, Amer. Journ. of Science, 3d Ser., xx, p. 396, 

 Xov., 1880; Proc. U. S. Xat. Mus. iii, p. 375, Jan., 1881. BALL, 

 Proc. U. S. Xat. Mus. iv, p. 408, 1882 ; Blake Gastrop., p. 413. 



The animal has eyes. There are seven rows of teeth, the dental 

 formula being 2'1'1*1*2 (pi. 39, fig. 17). Soft parts otherwise as in 

 Lepeta. The embryonic shell is spiral (pi. 39, fig. 19.) 



L. TUBICOLA Yerrill & Smith. PI. 39, figs. 17, 18, 19. 



Shell thin, white, smooth, conical with the apex acute and nearly 

 central; aperture broad elliptical, oblong or subcircular, usually 



