188 CADULUS-GADILA. 



white, glossy, and perfectly smooth, without the smallest appearance 

 of wrinkles or striae. Length scarce three-eighths of an inch ; diam- 

 eter of the largest part, about one-sixteenth." (Mont.}. 



C. DIV.E (Velain). PL 26, figs. 82, 83. 



Shell thin, white, transparent, elongated, moderately arcuated ; 

 obviously swollen at the upper third.; surface smooth and glossy, 

 showing some unequally spaced growth-striae when sufficiently 

 magnified. Anterior aperture perfectly circular, not oblique, con- 

 tracted, with simple and sharp peristome ; posterior orifice quite 

 large, simple, oblique, entire, without lobes or lateral slits. Length 

 4, diameter above f , below J mill. ( Velain). 



Island of St. Paul, in the crater, 90 meters (French Transit of 

 Venus Exped., 1874). 



Gadus divce [sic] CH. VELAIN, Arch. Zool. Exper. et Gene>., vi, 

 p. 128, pi. 5, f. 1, 2 (1877). 



Apparently resembles C. gadus. We have not seen specimens. 

 C. MINUTUS H. Adams. PJ. 26, fig. 78. 



Shell smooth, thin, arcuate, a little contracted anteriorly, whit- 

 ish. Aperture circular, slightly oblique. Length 4, diam. f mill. 

 (H. Ad.). 



Red Sea (Mac Andrew). 



Cadulus minutus H. AD., P. Z. S., 1872, p. 10, pi. 3, f. 9. Den- 

 talium minutum SOWERBY, Conch. Icon., xviii, pi. 7, f. 48 (1872). 

 COOKE, Ann. Mag. N. H. (5), xvi, p. 273 (1885). CLESSIN, Con- 

 chyl. Cab., p. 18 (1896). 



This may be a Disehides, but the apex has not been described. 

 Group of C. dentalinus. 



Slender forms with the greatest girth situated very near the aper- 

 ture, the constriction short and rather abrupt ; both apertures sub- 

 circular and simple ; surface smooth or circularly finely ribbed. 



This group contains the most slender members of the genus Cad- 

 ulus. The shell is considerably like that of Ditrupa, but less earthy 

 and of more regular growth. The species are of two kinds : eircu' 

 larly wrinkled and smooth. 



The sculptured series probably begins with C. perpusillus (Sowb.), 

 imperfectly described in 1832, but this is not positively known, as 

 the minute features of the surface of that species are still undescribed ; 

 the next species in point of seniority is C. dentalinus (Guppy) of the 



