69 



deep slits, forming four teeth, a large dorsal and a large ventral tooth, with smaller lateral 

 ones between. 



Length 12 mill., diam. of apert. 1,25, dorso-ventral diam. of apex 0,5, lateral diam. ofapexo,/. 

 Breadth of greatest inflation 1,5 mill. 



Section Gadila Gray 1847. 



1847. Gadila Gray, Proc. Zool. Soc. p. 159. For D. gadus Montagu. 

 1865. Heionyx Stimpson, Amer. Journ. Conch. I, p. 63. 



Gadus of some authors. Dentaliuui sp. of some early authors. 



Shell decidedly curved, the general contour convex ventrally, concave dorsally; more or 

 less swollen near the middle or toward the aperture, more tapering toward the apex; apical 

 orifice not contracted bv a callous rincj, or with the callus far within and weak; edees not slit, 



^ et ' 'O 



Type C. gadtcs Montagu. 



This group which includes a great majority of the species of the genus is more attenuated 

 and more bent than typical Cadulus, and lacks the apical .slits and teeth of Dischides and 

 Polyschidcs. (P. & Sh.). 



Key to species. 



I. Length not exceeding 4 mill C. simillifnus. 



II. Longer than 4 mill. 



a. The greatest diam. situated near the anterior third or fourth of the 

 shell's length. 

 5. Shell considerably swollen. 



C. gadtis, eiiloides, clavatiis. cohthi-idens^ virginalis and pseudolivi. 

 b' . Shell but little swollen and very gradually tapering toward both sides. 



C. angiiidens^ Z07iatiis and pHlcIicr)'i)mis. 

 a' . The greatest diam. situated near the anterior aperture. 



C. smgaporensis^ aórtcpto-injïatus and laevis. 



*I5. Cadiilus siniilliimis Watson. PI. III, tig. 46. 



1879. Caduliis similliiiius Watson, Journ. Linn. Soc, vol. XIV, p. 526. 



1885. Caduliis siiiiillimus Watson, Challenger Rep. p. 20, pi. 3, fig. 6. 



1897. Caduliis similliinus Watson. PiLSBRV & Sharp, Man. of Conch. vol. XVII, p. 182, 



pi. 26, fig. -JJ. 



Diagnosis. Shell very like Cadnhis gracilis Jeffr., rather broad, narrowed at both 

 ends, very slightly and symmetrically bent, but a little more towards the mouth, with a very 

 slight bulge, which just shows on the concave curve. It is thin, polished, translucent (weathering 

 opaque), with an opaque ring near the apex. Sculpture : very minute and faint and superficial 

 oblique striae, with a faint flocculence in the substance of the shell. Mouth rather large, oblique ; 



