158 62 



West of Koh Kill, 30 falhonis, sand and nuid (Va). 



Long. 6 mm., all. 6 mm. 



Distribution:— S. Nilandu Atoll (Maldive Isl.). 



In the collections of the Danish Expedition from the Gulf of Siam only one 

 small, transparent, white valve, the left, is found; in this the interior posterior lira 

 is very slightly developed. 



Amussium pleuronectes L. 



Ostiea pleuronectes, Linnk, Systeina Nat., ed. X, 1758, p. 69B. — ed. Xll, p. 1140, No. 1!)0. — Mus. Ludov. 



Ulr. Reg. 1764, p. 524. 

 I'ccten — — Maütini u. Chemnitz, Conehyl. Cabin, VII Bd., 2 Abth., p. 40, pi. 13, fig. 4. 



— — — Reeve, Conchol. icon., VIII, Pecten, Sp. 48. 



Commonly distributed from Koh Lan to Koh Kut, 8—30 fathoms, mud. 



Long. 7—87 mm. 



Distribution: — Andamans, Madras, Negapatam, Ceylon. — Poulo Condor, 

 China, Formosa, Japan, Philippines, Moluccas, Java, New Guinea, Torres Strait. 

 Flinders and Clairmont Isis. (North-east Australia). 



The number of the internal ribs in the valves varies greatly, therefore Amus- 

 sium Balloti, Bernardi, ' can scarcely be maintained as a distinct species. 



Order Eulamellibranchiata. 



Fam. Limidae. 



Lima (Mantellum) fragilis, Chemn. 



Pcclen fragilis, Chemnitz, Conehyl. Cabin., VII, 1784, p. 349, pi. 68, fig. 650. 



Lima — — Sowehby, Thesaurus Conehyl.. I, 1847, p. 86, No. 14, pi. 22, ligs. 34— 37. 



— — — Reeve, Concliol. icon., vol. 18, Lima, Sp. 18. 



— — — P. Fischer, Catalogue d. Mollusques de I'lndo-Chine, p. 210. 



Koh Kram, 30 fathoms (Vs). Gulf of Rayong, 7 — 10 fathoms, sand, mud {'^h). 

 Between Koh Chuen and Koh Mesan, 15 fathoms, mud (Va). S. of Koh Kahdat, 

 8-10 fathoms, mud (Va). Koh Kahdat ('/a). S. of Koh Mak, 5-6 fathoms (Va). 



Long. 5 — 15 mm., alt. 8—26 mm. 



Distribution:— Singapore, Mergui Archip., Nicobars, Persian Gulf, Lacca- 

 dive and Maldive Archip., Suez, Mauritius, Mozambique. — Poulo Condor, Philip- 

 pines, Amboina, New Guinea, Timor, Sorong, Torres Strait, North and East Australia, 



' .lourn. de Concliyl., IX, 1861, p. 46. 



