154 CADULUS-POLYSCHIDES. 



Length, 22 mill. ; greatest diameter, 4 ; breadth of the oral aper- 

 ture 2 ; diameter of posterior aperture, 1 mill. 



Atlantic, east of New Jersey and Maryland, from "Albatross."" 

 Station 2,043 in 1,467 fathoms (lat. 39 49', Ion. 68 28' 30" to sta- 

 tions 2,174, 2,221, 2,222 and 2, 228 (the latter in lat. 37 25', Ion. 

 73 06'), in 1,525 to 1,594 fathoms (U. S. F. C.). Near St. Vincent, 

 West Indies, in 464 fms. (Blake Exp.), 



Cadulus speetabilis VERRILL, Trans. Conn.Acad., vi, p. 432, pi. 

 44, f. 19, (1885). DALL, Bull. Mus. Comp. Zool., xviii, p. 429 

 (1889) : Bull. U. S. Nat. Mus., No. 37, p. 76, pi. 46, f. 19. 



" The specimen from St. Vincent is of a more even ivory white, 

 and rather less attenuated posteriorly than the specimens from New 

 England ; otherwise it seems to agree fairly with them (Ball). 



*' The species is remarkable for its great size, exceeding even C. 

 grandis ; for its gibbous swelling close to the anterior end ; and for 

 the rapid and strongly marked contraction of the oral aperture. 

 By the last named feature it is readily distinguished from C. grandis. 

 Taken in the largest numbers at Station 2,221, lat. 39 05' 30", Ion. 

 70 44' 30", where about twenty-five specimens occurred, part of 

 them living" (Verrill). 



C. GRANDIS Verrill. PI. 25, fig. 66. 



General appearance of the shell much like that of C. pandionis,. 

 but more than twice as large, without the abrupt bulging at the 

 largest part, which is a characteristic feature of the latter, and with 

 a relatively larger posterior aperture. 



The shell is, for the genus, large and strong, translucent bluish- 

 white when living, milk-white when dead, with a highly polished 

 surface, only faintly marked by the lines of growth when perfect. 

 The shell is moderately curved, the greater part of the curvature 

 being behind the middle, and is largest at about the anterior third, 

 the decrease being very gentle and regular in both directions, but a 

 little more rapid towards the anterior end. The dorsal side is a lit- 

 tle flattened towards the aperture, which is decidedly oblique and 

 very broad-elliptical. The posterior aperture is relatively rather 

 large, circular, with the edge a little thickened and divided inta 

 four rounded notches, the two upper ones being usually a little 

 deeper and farther apart than the two ventral ones. 



Length of one of the largest examples, 15 mill.; greatest diam- 

 eter, 3*5 ; transverse diameter of the oral end, 3 ; vertical diameter, 



