CADULUS. 161 



I have failed to see the callus-rib in the mouth to which Jeffreys 

 refers ; but there is within the posterior opening a circular rib or 

 narrow sharp ledge, which, from the outside, is seen as an opaque 

 band, but with some difficulty may be seen within as a narrow pro- 

 jecting shelf. The edge of the apex seems to me rather chipped 

 than regularly notched ( Watson). 



This species, known to me by specimens in Jeffrey's collection, is 

 rather more slender than C. cyathus. 



C. CURCURBITA Dall. PI. 25, fig. 54. 



This little shell is perhaps best described by saying that in form 

 it is about midway between C. obesus Watson and C. tumidosus 

 Jeffr. ; being larger than the former and more evenly tapered from 

 the middle than either. It wants the ledge within the aperture at 

 both ends, is polished, translucent, and without perceptible sculp- 

 ture ; neither of the apertures appear to be oblique ; both are circu- 

 lar. 



Length 4*0, oral diameter O62, anal diameter 0*37 mill. ; maxi- 

 mum diameter 1*25 mill. (Dall). 



Fernandina to Florida Strait, 294-310 fms. 



Cadulus curcurbitus DALL, Bull. M. C. Z., ix, p. 35 (1881).- 

 Cadulus curcurbita DALL, Bull. M. C. Z., xviii, Blake Rep., p. 431, 

 pi. 27, f. 12d ; Bull. U. S. Nat. Mus., No. 37, p. 78. 



The single specimen obtained [by the Blake] recalls C. gibbus 

 Jeffreys, but is very much larger and differently proportioned 

 (Dall). 



C. AMPHORA Jeffreys. PL 24, fig. 25. 



Shell resembling in shape an ancient wine-vessel without handles, 

 bulging towards the middle, gently curved, narrowing towards each 

 end, but more contracted at the base or point, rather solid, glossy 

 and opaque ; sculpture consisting of a slight but distinct keel which 

 encircles the shell on the upper two-fifths of its length ; that part is 

 somewhat excavated or flattened ; no striae of growth are percepti- 

 ble. Color white. Mouth circular, not oblique or sloping; base 

 notched on each side. Length O'l, breadth 0'35 inch (Jeffreys). 



Atlantic Station 16, Porcupine Exp. 1870. 



Cadulus amphora JEFFR., P. Z. S., 1882, p. 665, pi. 49, f. 9. 

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