CADULU8-POLYSCHIDES. 155 



2*5; diameter of the posterior end, 1*3 mill. Some specimens exceed 

 these dimensions ( Verrill). 



Off eastern coast of the United States, from " Albatross " Station 

 2,052, south of La Have Bank, east from Nantucket, lat. 39 40' 05", 

 Ion. 69 21' 25", in 1,098 fms., to Station 2,115 near Cape Hatteras, 

 in 843 fms.; at several intermediate stations in 906-1,290 fms. At 

 Station 2,043 in 1,467 fms., one large malformed specimen occurred 

 (U. S. Fish Commission). 



Cadulus grandis VERRILL, Trans. Conn. Acad., vi, p. 219, pi. 44, 

 f. 20 (1884). 



This species might readily be mistaken for a large form of C. 

 pandionis, but it differs from the latter in having a larger posterior 

 aperture, a more nearly circular oral aperture, and especially in the 

 absence of the abrupt bulging at the largest part. The form is 

 usually less curved, although in this respect both species are some- 

 what variable. This shell is, however, much thicker and in every 

 way more robust ( Verrill). 



C. DALLI Pilsbry & Sharp, n.sp. PL 30, figs. 19,20,21,22,23. 



Shell rather large, but little curved, smooth and glossy, but upon 

 revolving the shell a sort of excessively shallow, irregular, longi- 

 tudinal sulcation may be seen by the play of light on the larger 

 third of the shell, at least in some specimens; bluish-white and 

 slightly translucent, sometimes more opaque upon the dilated por- 

 tion. Moderately swollen posteriorly, the greatest diam. contained 

 about 5? times in the length of the shell, equator not defined, at 

 about the anterior third to fourth of the length, in front of that 

 point moderately contracted, behind it rather rapidly tapering. 

 Outline of concave side slightly or not perceptibly convex in the 

 neighborhood of the inflation ; otherwise nearly straight along the 

 larger half or two-thirds of the length, concave posteriorly. Tube a 

 trifle compressed vertically in the inflated part, elsewhere nearly 

 circular in section. Aperture slightly oblique, circular or nearly 

 so, the peristome thin and acute. Anal orifice subcircular, the edge 

 with a rather deep incision on each side, the dorsal (concave side) 

 margin cut into three, the ventral (convex) into two rounded lobes 

 or teeth by shallower incisions; a short distance within a slight cal- 

 lous ring may be seen. 



Length 13'7 mill. ; diam. at aperture 2*0 x 2*1, at greatest infla- 

 tion 2 - 45 x 2*56, at apex 09 x 0'9 mill, (the antero-posterior dimen- 

 sions in each case preceding). 



