A. E. Verrill — Mollvsca of the Nexo England Coast. 199 



Cyclostrema affine Verriu, sp. nov. 



Plate XXXII, figure 15. 



Shell rather large for the genus, with a moderately elevated spire, 

 a prominent, convex base, a narrow umbilical perforation surrounded 

 by spiral lines, and evenly rounded, nearly smooth whorls, separated 

 by a distinctly impressed suture. 



The nuclear whorl is moderately large, smooth, chestnut-brown, 

 rounded, slightly prominent, and a little incurved. The succeeding 

 whorls are evenly rounded, increasing rapidly, with a smooth and 

 somewhat glossy surface, and marked by faint lines of growth, and 

 occasionally with a few indistinct spiral lines below the suture, and 

 by numerous thin, raised, and well defined cinguli on the base ; the 

 innermost of these, immediately around the umbilicus, are stoutest 

 and most elevated, the size and elevation decreasing outwardly until 

 they disappear, iisually about midway between the umbilicus and the 

 periphery ; the inner ones are separated by intervals mostly about 

 equal to twice their breadth ; the outermost ones are relatively 

 farther apart, while the intermediate ones are usually nearest 

 together ; sometimes one or two of those revolving within the um- 

 bilical depression are decidedly larger than any of the others, taking 

 the appearance of small carina, but the outer ones are always fine 

 and thread-like. The aperture is somewhat oblique, large and nearly 

 round, but slightly flattened or indented opposite the body-whorl and 

 umbilicus ; the lip is thin and the inner portion is attached to the 

 body-whorl for only a very short distance, and shows a distinct, free 

 edge. The umbilicus is narrow, spirally twisted and often partially 

 concealed by the margin of the inner lip. Color grayish white, 

 often a little iridescent and somewhat lustrous. Operculum yel- 

 lowish horn-color. 



Length, 2'""'; breadth, 2-2"""; breadth of aperture, 1-3°"". 



Station 2115, N. lat. 35° 49' 30", W. long. 74" 34' 45", in 843 

 fathoms, five living specimens. 



This is closely allied to C. baslstriatum J., and C. rugulosum 

 Friele, of the European coasts. 



Cyclostrema diaphanum VerriU, sp. nov. 



Plate XXXII, figure 16. 

 Shell small, depressed, trochiform, thin, translucent, white, with a 

 smooth shining surface, without sculpture except around the small 

 umbilicus, where there are numerous fine, close, spiral lines. 



