250 Mr. E. A. Smith on Molhisca from the 



Hah. Indian Ocean, 1154 fath. ; var. from Station 248, 

 W. of Travancore, 22 1-284 fatli., sand. 



The greater part of the siirface of this interesting shell is 

 merely finely striated, but the younger portion is somewhat 

 distinctly lirate. It enlarges more rapidly than D. keras and 

 is more fiuely sculptured. The variety from Station 248 has 

 the striation continued to the aperture. 



Dentalium usitatum, Smith. 



Dentiilvim usitatum, Smith, Ann. & Mag-. Nat. Hist. 1894, vol. xiv. 

 p. 108, jil. iv. fio-s. 16, 16 a ; Pilsbry, Man. Conch, vol, xvii. p. 29, 

 pi. X. figs. 08, 69. 



Hub. Station 325, W. of Burraah, 843 fath. 



The largest specimen is 58 mm. in length, 1 mm. in 

 diameter at the tip, and 5 anteriorly. The apes was origi- 

 nally descwbed as "hand fissa,^' but the present examples 

 exhibit a very narrow slit, varying in length from 1 to 3 mm. 

 The presence or absence of an apical fissure is known to be 

 a variable character in some otlier species of this genus. 



Dentalium insolitum, Smith. 



Dentalium insolitinn, Smith, Ann. & Ma?. Nat. Hist. 1894, vol. .xiv. 

 p. 108, pi. iv. figs. 17, 17 a ; Pilsbry, Man. Conch, vol. xvii. p. 109, 

 pi. xxii. iigs. 50, 57. 



Hub. Station 282, off X. of Ceylon, 498-726 fath. 



Dentalium lubricatum, Sowb. 



Dentalium lubricatum, Sowerhy, Thes. Conch, vol. iii. p. 97, pi. ccxxv. 

 fig. 56 ; Reeve's Conc-h. Icon vol. xviii. fig. 55 ; Pilsbrv, Man. 

 Couch, vol. xvii. p. 110, pi. xix. fig. 22. 



Hub. Station 331, off Andaman Islands, 569 fath. 



A single specimen about the same size as the type from 

 Australia, but a trifle more curved, agreeing in this respect 

 with the two other specimens received together with the 

 figured shell in the Cuming Colkction. 



Dentalium eburneum, Linn. 



Dentalium ehurneum, Linn.; I'ilsbrv, Man. Conch, vol. xvii. p. 115, 

 pi. XX. figs. 33, 34. 



Hab. Station 271, off Malabar coast, 22 fath. 



The single specimen, 47 nmi. in length, differs only frem 

 the normal form in being a pale fiesh-colour instead of white. 

 It exhibits the raised rings anil longitudinal stria? so charac- 

 teristic of the species. 



