856 MESSRS. E. A. SMITH AND JI. H. BLOOMER ON [Nov. 27, 



SoLEN CORNEUS Lamavck ? 



Solen corneus Laiiik. ; Delessert, Recueil, ]A. ii. figs. 2 a, 2 b ; 

 Philippi, Abbild. vol. iii. p. 44, pi. ii. fig. 2 ; Sowerb}^ in Reeve's 

 Conch. Icon. vol. xix. pi. iv. fig. 19, pi. vii. fig. 18 6; Clessin, 

 Conch. -Cab. p. 9, pi. iii. figs. 8, 9. 



Hah. In fairly firm sand, halfway down the shore in Chnaka 

 Bay, Zanzibai- Island (Crosslaoid) ; Java {LamarcJi) ; Ilea 8ea 

 Philipjn) ; Japan, Philippine Islands {Bunker), 



I do not feel quite certain with regard to the identification of 

 Mr. Crossland's specimens, nor is it certain that the several shells 

 depicted by Delessert, Philippi, Sower by, and Clessin really belong 

 to the same species. The form figured in the ' Conchologia 

 Iconica ' most nearly resembles the Zanzibar shells, none of which, 

 however, is so large, the longest specimens being only 55 millims. 

 in length. They may, however, be only immature examples. — 

 E. A. S. 



The species dififers from /S'. vagina in the following particulars :— 



The animal curves a little dorsally. Its length, measuring from 

 the anterior end of the anterioi- adductor muscle to the posterior 

 end of the proximal portion of the siphon, is only 42 mm., and its 

 depth 8 mm. It is therefore not so deep or so wide as -S'. vagina. 



The forward projection of the A^entral part of the anterioi- 

 portion of the mantle-lobes is slightly moi-e pronounced, but the 

 gi-ooves in which lie the constricted anterioi- parts of the shell 

 are not quite so deep. 



The proximal portion of the siphon is externall}^ smooth and 

 not ridged dorso-ventrally like S. vagina. The anterior adductor 

 muscle is longer, but not so wide. The foot is rounder and the 

 distal portion lai-ger. Internall}^ the alimentai-y canal is similar, 

 with the exception of the stomach. The oesophageal and cardiac 

 divisions are smaller and the pyloric division is larger. The ca3cum 

 of the crystalline style leaves the stomach on the antero-ventral 

 side of the pyloric division. — H. PI. B. 



Solen acinaces Hanley ? 



Solen acinaces Hanley, Proc. Zool. Soc. 1843, p. 101 ; Sowerby 

 in Reeve's Conch. Icon. vol. xix. pi. vii. fig. 34 ; Clessin, Conch. - 

 Cab. p. 33, pi. xiii. fig. 3 (copy of Sowerby). 



Rab. Zanzibar Island. 



This species presents the follov/ing difierences from S. vagina : — 



The animal measures in length fi-om the anterior end of the 

 anterior adductor muscle to the posterior end of the proximal 

 portion of the siphon 42 miu., and it is 10 mm. in depth. It is 

 curved outwardly on the dorsal surface, and has a corresponding- 

 curve inwardly on the ventral surface. The conscresced portion 

 of the ventral edge of the mantle-lobes is very broad, much more 

 so than in >S'. vagina. The anterior adductor muscle is not so 

 wide. The distance from the posterior side of the posterior 



