CADULUS-GADILA. 185 



Cadulus viperidens Melv. & Standen, The Journal of Conchol- 

 ogy, viii, p. 274, pi. 11, f. 79 (Oct, 1896). 



Several specimens of a somewhat incurved, perfectly smooth 

 translucent, milky-tinged Cadulus, precisely corresponding with 

 unnamed specimens in the British Museum from the shore of North 

 Australia. In form it slightly recalls C. coluhridens Wats, from 

 New Zealand, but is more uniform in width and less ventricosa 

 towards the base. It is likewise smaller than either that species, 

 the common tropical ('. ^ac?MS Montagu, or C. Jeffrey si Monts. The 

 mouth is simple, round, the posterior or apical orifice also rounded 

 in diameter, has its edges labially bisected by a sharply cut channel. 

 {Melv. & Stand.). 



C. cLAVATus (Gould). PI. 26, figs. 80, 81, 79. 



Shell rather slender, moderately solid, considerably curved ; 

 maximum diameter situated near the larger end, gradually taper- 

 ing posteriorly, anteriorly rather rapidly contracting at the sides 

 and especially on the convex face, and very slightly on the concave 

 face. Tube slightly flattened between the convex and concave sides 

 throughout, least so at the apex. Bluish-white, becoming opaque- 

 white near the ends from the greater thickness of the shell there. 

 Surface smooth, glossy, showing no striation ; aperture (fig. 80) 

 slightly oblique, rounded-oval, a little more flattened on the convex 

 than on the concave side. Apex small, rounded oval, with perfectly 

 simple, sharp edge. Length 11, diameter at aperture 12 x J "4, at 

 greatest girth 1-76 x 1-85, at apex '55 x 0.6 mill. 



Hong Kong Harbor, China, 6-20 fms. (Wm. Stimpson). 



Dentalium clavatum Gould, Proc. Bost. Soc. N. H., vii, p. 166 

 (1859). — Helomjx clavafus Stimpson, Amer. Journ. Conch., i, p. 63, 

 pi. 9, f. 14 (1865). 



Stimpson has figured and described the living animal (fig. 79) : 

 "Foot greatly elongated, cylindrical, and obtuse at the extremity; 

 collar apparently entire ; anal siphon longer than in Dentalium, not 

 fissured." 



Mr. A. H. Cooke reports C. clavatus from the Gulf of Suez, 

 dredged by MacAndrew (Ann. Mag. N. H. [5], xvi, p. 275). 



Our figures and description are from the type, U. S. Nat. Mus. 

 O. HONOLULUENSis (Watson). PI. 26, fig. 76. 



Shell cylindrical, bent, and attenuated from about the middle to 

 the apex, toward the mouth very slightly contracted, of a dull white 



