280 184 



Siam (J. DE Morgan). 



Distribution: — Malacca, Poulo Penang, Andamans, Nicobars, Birma, Kaiikal 

 (Coromandel, Dautzenberg), Mekran Coast, Gulf of Oman, (Gulf of Suez, Mac 

 Andrew?) — Hong Kong, Philippines, Moluccas, New Guinea, Torres Strait. 



S. coarctatus, Gmelin, which in the course of time has indicated various species, 

 viz. both tlie European S. antiquatiis, Pult., and the East Indian form, and has 

 therefore caused some confusion, ought, in my opinion, to give place to Spengler's 

 name emarginatus. Gmelin was evidently not clear with regard to his species, both 

 his diagnosis (true, he says "medio coarctata," but does not mention more closely the 

 characteristic depressed rays upon the middle of the valves), and his statement that 

 "Solen anatinus, Linné" (non S. anatinus L. ^ Anatina subrostrata, Lam.), in 

 Schröters's "Flussconchylien'" was synonymous with his species, show his uncer- 

 tainty and that he has confused several species with the species in question, which 

 he evidently did not know by personal observation. Spengler, in whose collec- 

 tion the specimen was contained which Chemnitz^ in 1782 described and figured, 

 gave in 1794 an exhaustive and accurate diagnosis of it under the name of S. 

 emarginatus, and I think that this should be preferred to Gmelin's name. I rely 

 upon Edg. Smith's authority in giving S. Scheepmakeri, Dunk., as a synonym of the 

 species under consideration, though it attains a size that is probably not attained 

 by S. emarginatus, Spengl. typ. As far as I can judge from the figure and the brief 

 diagnosis Novaculina andamanensis, Preston,^ is nothing else but the present species. 



Fam. Gastrochaenidae. 



Gastrochaena gigantea, Desh. 



Fistulana gigctntea, Deshaves, Éncyclop. niéth. Hist. nat. d. vers., II, 1830, p. 142. 



Gastrochœna — — Traité élém. de Concliyl. (1834), pi. 2, figs. 6-8. lixplic. d. planches, p. 2. 



Tome 1, 2 part., p. 34. 



— — — SowERBY in Reeve, Conchol. icon., XX, 1878, Gastrochœna, Sp. 15. 

 _ — — — Thesaur. Concliyl., V, 1887, p. 128, No. 4, pi. 470, fig. 12. 



— — — Clessin in Martini u. Chemnitz, Conchyl. Cabin., XI, 4 Abtli. a, p. 13, 



No. 22, pi. 4, figs. 8— 9. 

 Rocellaria — — Edg. Smith in The Fauna and Geography of the Maldive and Laccadive 



Archipelagoes, ed. by Stanley Gardiner, II, p. 626, No. 362. 

 Gastrochaena — - Lamy, Bull, du Mus. d'Hist. Nat. Paris, 1906, p. 207. 



Gastrocluena lamellosa, Edg. Smith (non Deshayes), Report on the Lamellibranchiata of the Challenger 



Expedition, p. 28, pi. 7, fig. 2. 



Koh si Chang (1). Koh Chang, low tide (1). North end of Koh Chang, old 

 coral blocks, 1 — 12 fathoms (13). South end of Koh Chang, 1 fathom, corals (1). 

 Koh Kahdat, 1 fathom Ç/â). 



' Schröter, Geschichte d. Flussconchylien. Halle 1779, p. 185, pi. 9, fig. 17. 



- MÖRCH, both in Malakozool. Blatter, 1870, p. 110, No. 21, and upon the label attached to Spengleh's 

 original specimen, has given the name Solen constrictns, Chemn. 



3 Records of the Indian Museum, II, Calcutta 1908, p. 209, pi. 16, tig. 40. 



