172 A. E. Verrill — MoUusca of the New England Coast. 



Length of the largest specimen, 80'"'"; breadth, 1/""'"; length of 

 body-whorl to tip of canal, 23""" ; length of aperture and canal, 19'""'; 

 breadth of aperture, 8""". 



A living specimen was obtained at station 2042, N, lat. 39° 33', 

 W. long. 68° 26' 45", in 1655 fathoms (No. 37,955), by the Albatross. 



This species bears little resemblance to any of those previously 

 described from our coast. It is a larger and much stouter shell than 

 S. pygmmus., with much more convex whorls, and the latter species 

 is without transverse ribs on the upper whorls. The last named 

 character shows an affinity with 8. coelatus and S. glyptus, but these 

 are both smaller and more slender, and are ribbed in a much higher 

 degree. 



Sipho cselatus, var. hebes Vemll, nov. 



This variety differs from the typical form in having the spire 

 shorter, and more abruptly tapei-ed toward the tip, and in having 

 the'whorls somewhat flattened, with the suture shallower, so as to 

 give the shell a more cylindrical form. The ribs are numerous and 

 well developed on all the whorls below the nucleus, and are distinctly 

 excurved on the most convex part of the whorls. The lines of 

 growth are thin and close, but are distinctly raised, and run parallel 

 with the ribs. The spiral cinguli are very numerous, rather thin, not 

 very prominent, often nearly obsolete on the last whorl. The oper- 

 culum is ovate or pear-shaped, with the anterior end obtusely ])ointed 

 and a little incurved, with the nucleus at the inner edge, near the 

 anterior end, and showing a very slight tendency to the subspiral 

 structure. 



This form occurred at station 2003, N. lat. 37° 16' 30", W. long. 

 74° 20' 36", in 640 fathoms, three specimens, one living (No. 35,659) ; 

 station 2077, N. lat. 41° 09' 40", W. long. 66° 02', in 1255 fath., one 

 living specimen (No. 38,015) and station 2103, N. lat. 38° 47' 20", 

 W. long. 72' 37', in 1091 fath., one living and one dead (No. 35,424). 



Sipho (Mohnia) caelatulus Verriii, sp. nov. 



Shell small, fusiform, with an elevated, acute spire, the lower 

 whorls with transverse ribs and raised spiral lines, the upper ones 

 usually without ribs; in general appearance resembling 8. cad at ns^ 

 but with the spire more elevated and acute and the ribs less strongly 

 developed. Whorls about seven, moderately convex, not distinctly 

 shouldered; suture rather deep, simple. The nucleus is small, 

 smooth and little prominent, consisting of about two whorls; the api- 



