CADULUS-GADILA. 169 



very slightly curved, the dorsum beiug nearly straight except at the 

 posterior tburth, oral end very slightly tapered, not flattened ; pos- 

 terior part gently tapering from the anterior third ; anal end rather 

 stout, opening simple, circular; oral end thin, mouth forming an 

 angle of 45° with the axis, simple, quite circular; the tube with no 

 pronounced gibbosity. Length 9, max. lat. 2, oral diameter 1"5 

 mill.; anal diam. 0'75, maximum diam. 2 mill. (Dall). 



' Blake ' Station 5, in 229 fras. (Blake). 



Cadulus agassizii Dall, Bull. M. C. Z., ix, 1881, p. 35 ; Ibid, xviii, 

 p. 430, pi. 27, f. 12c ; Bull. U. S. Nat. Mus., 37, p. 78, pi. 27. f. ] 2c. 



No more specimens of this species have come to hand. It is very 

 like C. pandionis Verrill, but has the anterior aperture less oblique, 

 the equator more marked, the posterior part proportionally shorter 

 and less attenuated. It is also smaller than C. pandionis. The 

 latter has about the same range as C. carolinensis, but has not been 

 found yet south of Fowey Rock, Straits of Florida, where it was 

 collected by Dr. W. H. Rush, U. S. N. (Dali). 



Var. HATTERA8ENSIS Sharp & Pilsbry, n. v, PI. 33, figs. 50, 51,52, 



53, 54. 



Shell moderately strong, not much curved, the convex curve 

 more arcuate toward the larger end, opposite outline slightly con- 

 vex at the anterior third, concave behind and slightly so in front of 

 the convexity. Swelling moderate, greatest near the anterior third 

 of the length, thence tapering considerably toward each end ; great- 

 est breadth contained about 4? times in the length of the shell. 

 Circular in section from the middle to the aperture, decidedly com- 

 pressed vertically at the apex. Surface smooth and glossy ; opaque 

 white, irregularly banded obliquely with translucent. Aperture 

 quite oblique, circular, the peristome inflexed along the convex 

 margin. Anal orifice transversely oval, with a stout callous ring a 

 short distance within. 



Length 7"8 mill.; diam. at aperture I'l xl'O; at greatest inflation 

 1-67 X 1-76 ; at apex 0-8 x 85 mill. 



Length 7*9 mill.; diam. at aperture l'2xl"25; at greatest 1*7 

 X 1-87, at apex 0*8 x 0"9 mill. 



Off Cape Hatteras, lat. 35° 10' SO", Ion. 75° W 12", in 293 fms. 

 (Dr. W. H. Rush, U. S. N.). 



Probably referable to C. agassizii Dall as a variety, but showing 

 some rather prominent features not mentioned in Dall's description. 



