A. E. Verrill — 3Iollusca of the JVew England Coast. 167 



and to whom the writer is indebted for important assistance in the 

 preparation of this paper. 



It is not very probable that this species properly belongs to Pleic- 

 rotomella. I have placed it here, for the present, only provisionally. 



G-ymnobela Verrill, gen. nov. 



Shell in form and general appearance like BeJa. Spire generally 

 rather short. Body-whorl swollen. Nucleus with fine cancellated 

 sculpture. Subsutural band not strongly marked. Posterior notch 

 of lip shallow and usually not very distinct. Operculum absent. 



Gymnobela engonia VerriU, sp. nov. ■ 



Shell somewhat solid, white, more or less translucent, stout-fusi- 

 form, with the aperture about equal in length to the spire, which is 

 shouldered, decidedly turreted, and tapered regularly to an acute 

 apex. 



Whorls five below the nucleus, strongly angularly shouldered at 

 about the middle, the portion above the shoulder forming a wide, 

 abruptly sloping subsutural band, which is usually slightly concave in 

 the middle, but swells a little where it joins the suture ; the whorls 

 are flattened below the shoulder and a little narrowed at the suture, 

 which is strongly impressed. The sculpture on the subsutural band 

 consists of numerous, close, revolving lines, most distinct towards the 

 shoulder, and of small, slightly raised, thin riblets, which are most 

 distinct close to the suture and strongly excurved in the middle of 

 tiie band, but bend forward strongly to the angle of the shoulder, 

 where most of them disappear or blend with the ribs and lines of 

 growth a little farther forward. Below the shoulder the surface is 

 covered by many, rather thin, closely arranged, revolving cinguli, 

 which on the whorls of the spire are separated by interspaces about 

 twice their ow n width, but become much closer on the middle of the 

 last whorl, gradually becoming coarser and more widely separated 

 as they approach the canal, those on the anterior part being also 

 thicker and more obtuse. Numerous rather small and slightly ele- 

 vated ribs commence at the shoulder and curve obliquely forward 

 across the convex part of the whorls, extending to the suture on the 

 upper whorls, but mostly fading out at the middle of the last whorl ; 

 these ribs are obtusely rounded and wave-like, the interspaces being 

 shallow, concave, in breadth about equal to the ribs ; on the last 

 whorl there are from twenty-five to thirty. On the spire-whorls the 



