280 184 
Siam (J. pE MorGan). 
Distribution: — Malacca, Poulo Penang, Andamans, Nicobars, Birma, Karikal 
(Coromandel, DaurzENBERG), 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 the European S. antiquatus, 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 
ScurOrers’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 Cuemnirz” in 1782 described and figured, 
gave in 1794 an exhaustive and accurate diagnosis of it under the name of S. 
emarginatus, and | think that this should be preferred to GMELINn’s name. I rely 
upon Ene. Smirn’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 gigantea, DesHayes, Encyclop. méth. Hist. nat. d. vers., Il, 1830, p. 142. 
Gastrochena — -= Traité élém. de Conchyl. (1834), pl. 2, figs. 6-8. Explic. d. planches, p. 2. 
Tome I, 2 part., p. 34. 
_ — _ Sowersy in REEVE, Conchol. icon., XX, 1878, Gastrochena, Sp. 15. 
— — Thesaur. Conchyl., V, 1887, p. 128, No.4, pl. 470, fig. 12. 
_ - CLessiIn in Martini u. CHEMNITZ, Conchyl. Cabin., XI, 4 Abth. a, p. 13, 
No. 22, pl. 4, figs. 8—9. 
Rocellaria —_ Epc. Smirn 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. 
Gastrochena lamellosa, EvG.Smiru (non DesHayes), Report on the Lamellibranchiata of the Challenger 
Expedition, p. 28, pl. 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 (1/2). 
1 ScurOrer, Geschichte d. Flussconchylien. Halle 1779, p. 185, pl. 9, fig. 17. 
2 Morcu, both in Malakozool. Blatter, 1870, p. 110, No. 21, and upon the label attached to SPENGLER’S 
original specimen, has given the name Solen constrictus, Chemn. 
5 Records of the Indian Museum, II, Calcutta 1908, p. 209, pl. 16, fig. 40. 
