224 128 



Raeta pulcheUa, Adams & Reeve, Hidalgo, Fauna malacol. de 1. isl. Filipinas, II, p. 58, No. 119. 

 Mactra roslralis, Dkshayes, Proc. Zool. Soc. London, XXII, 1854, j). 09, No. ;V2. 



— — — Reeve, Concliol. icon., VIII, Mactra, Sp. 11 SI. 

 Raeta — — Dunker, Index molluscor. mar. Japon., 1882, p. 185. 



The sound of Koh Chang, 5 fathoms, soft clay ('/■.>). 



Long. 25 mm., alt. 17 mm. 



Distribution:— Borneo, Philippines, China, Japan (Yokohama). 



The specimen from Koh Chang is larger than the individuals which have 

 hitherto been described (long. 20 mm., alt. 14 mm.); it bears a very strong resem- 

 blance to the form taken by R. Sturany^ at Ras Mallap in the Gulf of Suez in 50 

 fathoms, which he names Raëta bracheon; how far this species is synonymous with 

 R. pulcheUa, Ad. and Reeve, I am not prepared to say. Unfortunately, my material 

 consists only of a solitary, broken, left valve, of which I give a figure for future 

 comparison. 



Raëta anatinoides, Reeve. 



Mactra Anatinoides, Reeve, Conchol. icon., VHI, 1854, Mactra, Sp. 123. 



The sound of Koh Chang, 3 — 5 fathoms, soft clay (''Is, partially fragments) 

 N. of Koh Kong, 8 fathoms, mud (-/s). 



Long. 5 — 14 mm. (long. 14 mm., alt. 12 mm.). 



Distribution unknown. 



By comparisons in the British Museum, I have convinced myself that the 

 specimens from tlie Gulf of Siam are really identical with R. anatinoides, Reeve, 

 and not with R. pellicula, Desh., which, however, comes near to R. anatinoides, Reeve. 



Standella pellucida, Ch. 



Mactra pellucida, Chemnitz, Conchyl. Cabin., VI, 1782, p. 235, pi. 24, fig. 234. 



— — — Spengler, Skrivter af Naturhistorie-Selskabet, V Bd., 2 H., 1802, p. 123, No. 29. 



— — — Reeve, Conchol. icon., VIll, Mactra, Sp. 118. 



— — — Weinkauff in Martini u. Chemnitz, Conchyl. Cabin., XI Bd., 2 Abtli., p. 17, 



No. 14, pi. 5, fig. 1. 

 Standella — — Hidalgo, Fauna malacol. de 1. isl. Filipin., II, p. 57, No. 117. 



— ■ (Merope, pellucida, Chemnitz, Melvill & Standen, Proc. Zool. Soc. London, 1906, p. 828. 

 Mactra depressa, Lamarck, Hist. nat. d. anim. s. vert., V, 1818, p. 479, No. 29. — éd. 2, VI, p. lOG, No. 29. 



— — — Encyclop. method., II, 1830, p. 398. 



Coast of Lem Ngob (1 + ^/s). The strand off the MangroA'e at the station on 

 Koh Chang, quite shallow water (6). 



Long. 7—48 mm. 



Distribution: — Bombay, extending southwards to Ratnagiri (Melvill & 

 Standen). — Philippines. 



Melvill and Abercrombie write that dead specimens of the present species 

 are common at Bombay; the two right valves from Lem Ngob are also from dead 

 individuals, all the other individuals, which are small, were taken alive. 



' R. Sturanv, Lamellibranchiata d. Rotlicn Meeres. Wien 1899, p 12, No. 10, pi. 3, figs. 1 ß. 



