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Show 856 MESSRS. E. A. SMITH AN1) H. H. BLOOMER ON [Nov. 27, S olen corneus Lamarck ? Solen corneus Lamk.; Delessert, Recueil, pi. ii. figs. 2«, 2 b; Philippi, Abbild. vol. iii. p. 44, pi. ii. fig. 2 ; Sowerby in Reeve's Conch. Icon. vol. xix. pi. iv. fig. 19, pi. vii. fig. 18/>; Clessin, Conch.-Cab. p. 9, pi. iii. figs. 8, 9. Hab. In fairly firm sand, halfway down the shore in Chuaka Bay, Zanzibar Island (Crossland); Java (Lamarck); Rea Sea Philippi) ; 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, Sowerby, 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 differs from S. vagina in the following particulars :- The animal curves a little dorsally. Its length, measuring from the anterior end of the anterior 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 ventral part of the anterior portion of the mantle-lobes is slightly more pronounced, but the grooves in which lie the constricted anterior parts of the shell are not quite so deep. The proximal portion of the siphon is externally 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 larger. Internally the alimentary canal is similar, with the exception of the stomach. The oesophageal and cardiac divisions are smaller and the pyloric division is larger. The caecum of the crystalline style leaves the stomach on the antero-ventral side of the pyloric division.-H. H. B. S olen 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). Hab. Zanzibar Island. This species presents the following differences from S. vagina :- The animal measures in length from the anterior end of the anterior adductor muscle to the posterior end of the proximal portion of the siphon 42 mm., 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 |
