(LECUM. 77 



apparatus consists of two plumes or one only. Young 

 shells are more convex and tapering, and their mouth 

 is bell-shaped. The fry is exceedingly curious. It is 

 long and twisted, not unlike the horn of an antelope ; 

 its posterior termination is formed of a minute coil of 

 two whorls. The concentric ridges are then percep- 

 tible towards the mouth only, and are very slight ; the 

 rest of the shell is quite smooth and glossy. I am in- 

 debted to the Marquis James Doria for baby specimens 

 which he dredged at Spezzia. 



This is the Dentalium imperforatum of Adams ' On 

 the Microscope ' (from Walker's figure), as well as of 

 Montagu who described the young as D. trachea ; but 

 the latter specific name is now generally used. Brown 

 called it Brochus striatus and B. trachiformis ; Cailliaud 

 spelt the name C. trachcea. The fry is Costa' s Spiroli- 

 dium Mediterraneum. 



Brochus annulatus and (young) B. reticulatus of Brown 

 (" Loch Strangford ") is an exotic species. Dr. P. 

 Carpenter found no less than 53 specimens of it by 

 washing the common sponge of commerce from the 

 West Indies ; and Mr. Bean has some from Aden. I 

 mention this because C. annulatum has been noticed and 

 figured in the ' British Mollusca ' on the authority of a 

 specimen received by Mr. Alder from Mr. Clark. Flem- 

 ing's description of his Orthocera trachea (Br. An. p. 237) 

 evidently applies to the same foreign species. 



B. Thin and smooth ; operculum convex. Brochina, Gray. 

 2. C. GLABRUM *,(Montagu.) ^-*]o 



Dentalium gldbrum, Mont. Test. Br. p. 497. C. glabrum, F. & H. iii. 

 p. 181, pi. Ixix. f. 5. 



BODY pure-white, with the lines forming the canal or groove 

 * Smooth. 



