CADULUS-GADILA. 167 



vi, p. 375, name only (1880). — Verrill, Trans. Conn. Acad., vi, p. 

 220 (1884). 



Verrill reports this species from Fish Commission Station 2,041, in 

 1,608 fras. 



C. LUNULA Dall. PI. 25, fig. 55. 



Shell translucent white, smooth, destitute of sculpture ; dorsum 

 nearly straight, slightly inflated near the middle ; oral end con- 

 tracted, not flattened, and more slender at the mouth than the pos- 

 terior end ; the shell largest in the middle, and tapering nearly 

 equally to both ends ; apertures simple, circular, the oral one ob- 

 lique and quite contracted in proportion to the rather stout form of 

 the shell, which, but for the curve of the convex side and extreme 

 ends, would be nearly evenly fusiform ; there is no gibbosity, and, 

 though the anal aperture is the larger, it seems unbroken. Length 

 6*0 mill., oral diam. 0'75, anal 0*87 mill.; maximum diam. 1*5 mill. 

 {Dall). 



Off Cape Lookout, N. C, 18 fms. (Albatross); Barbados, in 100 

 fras. (Blake) ; Florida Keys, in deep water. 



a lumdm Dall, Bull. M. C. Z., ix, p. 35 (1881).— C. lunula 

 Dall, Ibid, xviii, p. 431, pi. 27, f 8 (1889) ; Bull. U. S. Nat. Mus., 



No. 37, p. 78, pi. 27, f 8. 



Most like C. simillimus Watson, from which it diff^ers in its more 

 even half-moon shape and proportions. (Dall). 



Group of C. olivi. 



Species in which the greatest diameter is at the anterior third or 

 fourth of the length, the shell tapering considerably posteriorly. 



C. WATSONi Dall. PI. 25, fig. 50. 



Shell translucent white, polished, showing faintly the annular 

 lines of growth ; slightly curved, with the greater portion of the 

 curve in the anal third ; tapering rapidly from the oral third to the 

 posterior end ; the oral third flattened on the convex side toward 

 the mouth; this portion also tapered laterally in the same direction ; 

 oral aperture perceptibly oblique in the most perfect specimen, 

 slightly so in another; the transverse diameter of the mouth very 

 slightly longer than the vertical diameter. Length 13"0, oral diam. 

 1*5, anal 0'6 mill ; maximum diam.2"25 mill, (measured from front 

 to back) ; maximum transverse diameter 2*9 mill. (Dall). 



