174 A. E. Verrill — Molhisca of the Nevj England Coast. 



long. 66° 00' 50", in 906 fathoms, one hundred and- twenty-five speci- 

 mens, seventy-five living; station 2077, N. lat. 41° 49' 40", W. long. 

 66° 02', in 1255 fatlioms, fifty-five specimens, twenty-five living ; and 

 station 2084, N. lat. 40° 16' 50", W. long. 67' 05' 15", in 1290 

 fathoms, one hundred and fifty specimens, seventy-five living. 



Tliis species might readily be mistaken for S. cmlatus V., but the 

 latter has a shorter, less acute and more abruptly tapered spire, a 

 shallower suture, and the transverse ribs are prominent even on the 

 whorls next to the nucleus. The sculpture, however, on the lower 

 whorls agrees very closely. The operculum differs in form and 

 structure. aS'. ylyptas has the spire longer and more acute, with the 

 nucleus more prominent and diflferent in form. Its spiral sculpture 

 is more highly developed and quite distinct in appearance from that 

 of the present species. Although this species is referred to the sub- 

 genus Mohnia, on account of the subspiral structure of the opercu- 

 lum, this feature is less marked than in Mohuia Mohnii, the type of 

 the group, as established by Friele, in this respect agreeing nearly 

 with Sipho [llohnia) pai'vus V. and S. In fact, in respect to the 

 operculum, it is somewhat intermediate between typical Sipho and 

 Mohnia. 



Sipho (Mohnia) simplex Veniii, sp. nov. 



Shell small, short-fusiform, thin, delicate, somewhat translucent, 

 with evenly convex whorls, and with numerous fine spiral lines and 

 raised lines of growth, but without ribs. Canal short, nearly 

 straight. Spire rather short, regularly tapered, acute. AVhorls five 

 or six, evenly rounded, rather convex. Suture well impressed, sim- 

 j)le. The nucleus is very small, smooth, with the apical whorl mi- 

 nute, regularly spiral and largely concealed by the next whorl. Faint 

 spiral lines commence on the second whorl. On the first whorl be- 

 low the nucleus there are four or five thin, sharp cinguli ; on the 

 next these increase to ten or twelve, which are nearly equal, mod- 

 erately raised, and separated by interspaces of about their own 

 width ; on the body-Avhorl the cinguli become very numerous and 

 very regular, covering the whole surface to the base of the canal, but 

 some of those around the periphery are somewhat thicker than the 

 rest, with the summit somewliat obtuse or flattened ; alternating 

 with tliese are others of smaller size and thinner. The whole sur- 

 face, both of the cinguli and interspaces, is crossed by very nume- 

 rous, close, thin, raised, lanielliform lines of growth, which recede 

 on the more convex part of the whorl, but bend forward toward the 



