186 CADULUS-GADILA. 



trausluceucy, 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 iiv 

 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 0016 inch. ( Watson). 



Reefs off Honolulu, 40 fms. (Challenger). 



Siphodentalium honoluluense Wats., Journ. Linn. Soc. Lond., xv, 

 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). PL 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 4i to 41 times 

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

 what like that of C. incisus ; no perceptible growth-strise ; 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, it» 

 edge apparently free from slits when uninjured. 



Length 7-6 mill. ; diam. at aperture 0*95 x 1-26; at largest 1-68 

 xl"79; at apex 0'47 x 048 mill.; the autero-posterior diameter 

 given first in each case. 



Length 6*53 mill. ; diam. at aperture 082 x 09 ; at largest 1-37 



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



Habitat uncertain^ 



Denlalium gadus Mont., Testacea Britanica, p. 476, pi. 14, f. 7 

 (ISOS^.— Cadulusgadus Mont., Jeffreys, Ann. Mag.N.H.(4),xix, 

 p. 157 (1877).—? Cadulus gadus Cooke, Ann. Mag. N. H. (5), xvi, 

 p. 275. — ? C. gadus Sowb., Melvill & Abercrombie, Mem. & 

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



