186 CADULUS-GADILA. 



translucency, and not glossy. Sculpture : The surface, especially 

 toward the apex, is faintly marked by microscopic, remote, oblique^ 

 raised, encircling rings, parallel to which there are fine scratches in- 

 the intervals. Edge of the mouth very oblique, blunt; apex not 

 small, broken. Length 0'21, breadth, greatest 0'031, at mouth 

 0-028, at apex O'OIG inch. (Watsoti). 



Reefs off Honolulu, 40 fms. (Challenger). 



Siphodentalium honoluluense WATS., Journ. Linn. Soc. Lond.jXV, 

 p. 89 (1880) ; Chall. Rep., p. 17, pi. 2, f. 10. 



This species closely resembles Siphodentalium tetraschistum Wats.,, 

 but, besides the obvious difference in size, that species is a little more 

 cylindrical and is much more strongly and uniformly sculptured. I 

 say nothing of the peculiar feature of the apex of that species, be- 

 cause the point being broken in the solitary specimen of the present 

 species, comparison is impossible. ( Watson). 



C. GADUS (Montagu). PI. 31, figs. 28, 29, 30, 31, 32. 



Shell small, rather thin, but little curved and that mainly poste- 

 riorly ; anterior half considerably and very regularly swollen, the 

 greatest diameter slightly behind the anterior third of the length ; 

 tapering toward the aperture on all sides, a little more rapidly 

 tapering posteriorly, decidedly attenuated toward the small apex. 

 Outline of concave side decidedly modified and quite convex in the 

 region of the inflation. Greatest diameter contained 4 to 4i times 

 in the length of the shell. Surface smooth, with a glimmer some- 

 what like that of C. incisus ; no perceptible growth-striae ; color 

 whitish, imperfectly translucent. Tube slightly compressed from 

 front to back, throughout. Aperture quite oblique when unbroken, 

 and rounded-oval. Anal orifice very small, of the same shape, its 

 edge apparently free from slits when uninjured. 



Length 7'6 mill. ; diarn. at aperture 0'95 x 1'26; at largest 1'68 

 xl'79; at apex 0'47 x 0'48 mill.; the autero-posterior diameter 

 given first in each case. 



Length 6'53 mill. ; diam. at aperture 0'82 x 0'9 ; at largest 1-37 



x 1-58, at apex 0'33 x 0'42 mill. 



Habitat uncertain* 



Dentalium gadus MONT., Testacea Britanica, p. 476, pi. 14, f. 7 

 (1803). Cadulusgadus Mont., JEFFREYS, Ann. Mag.N.H.(4),xix,. 

 p. 157 (1877). ? Cadulus gadus COOKE, Ann. Mag. N. H. (5), xvv 

 p. 275. ? C. gadus Sowb., MELVILL & ABERCROMBIE, Mem. & 

 Proc. Manchester Lit. and Philos. Soc. (4), vii, p. 25. 



