164 CADULUS-GADILA. 



C. MINUSCULUS Dall. PL 32, figs. 42, 43. 



Shell minute, fusiform, moderately swollen in the middle, the 

 greatest diameter contained nearly four times in the length of the 

 shell. Convex outline regularly and strongly arcuate ; opposite out- 

 line nearly straight, very slightly convex near the middle and as 

 slightly concave toward each end ; lateral outlines as seen in a dor- 

 sal or ventral view, strongly arcuate, much tapering toward each 

 end. Greatest girth about median, or a little nearer the aperture. 

 Tube a little compressed between the concave and convex sides in the 

 middle, subcircular in section toward the ends. Surface smooth, 

 glossy, whitish. Aperture hardly oblique (broken in the specimen 

 seen), circular. Anal orifice nearly as large as the aperture, sub- 

 circular, unslit. 



Length 2*33 mill. ; antero-posterior diameter of aperture 0*342, of 

 greatest girth 0'58, of apex 0*29 mill. ; lateral diameter, aperture 

 0-342, equator 0'616, apex 0'3 mill. 



Off Hatteras in 63 fms. (U. S. Fish Commission). 



Cadulus minusculus DALL, Bull. M. C. Z., xviii, Blake Rep., p. 432 

 (1889) ; Bull. U. S. Nat. Mus., No. 37, p. 78. 



Very similar to C. subfusiformis in form and size, but minusculus 

 is somewhat stouter, with the aperture less oblique. C.jeffreysi is 

 larger with oval apertures, and is more attenuated toward the apex. 

 Our figures and description are from the type, No. 93,122, U. S. Nat. 

 Mus. 



C. JEFFREYSI (Monterosato). PI. 24, fig. 39 ; pi. 32, figs. 44, 45, 46. 



Shell small, thin, quite arcuate, moderately swollen, the greatest 

 diameter contained slightly over 4 times in the length of the shell. 

 Convex side with strongly, regularly arched outline, concave side 

 with gently but distinctly convex swell in the middle, concave toward 

 each end. Greatest girth nearly median, but slightly nearer the 

 oral end, the swelling everywhere gentle, "equator" indistinct. 

 Tube circular in section at the middle, laterally compressed toward the 

 aperture, vertically compressed toward the apex. Surface glossy, 

 smooth ; of a bluish-milky color, a little translucent, becoming more 

 translucent near the aperture. Aperture oval, being compressed from 

 side to side, somewhat oblique, the peristome thin. Anal orifice 

 strongly compressed between the convex and concave sides, with unslit 

 edges. 



