158 62 
West of Koh Kut, 30 fathoms, sand and mud (1/2). 
Long. 6 mm., alt. 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. 
Ostrea pleuronectes, Linnté, Systema Nat., ed. X, 1758, p. 696. — ed. XII, p. 1145, No. 190. — Mus. Ludovy. 
Ulr. Reg. 1764, p. 524. 
Pecten — — Martini u. Cuemnirz, Conchyl. Cabin, VII Bd., 2 Abth., p. 49, pl. 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 Isls. (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. 
‘am. Limidae. 
Lima (Mantellum) fragilis, Chemn. 
Peclen fragilis, Cuemnirz, Conchyl. Cabin., VI, 1784, p. 349, pl. 68, fig. 650. 
Lima - — Sowerby, Thesaurus Conchyl., I, 1847, p. 86, No. 14, pl. 22, figs. 34—37. 
— = Reeve, Conchol. icon., vol. 18, Lima, Sp. 18. 
P. Fiscuer, Catalogue d. Mollusques de Il’Indo-Chine, p. 210. 
Koh Kram, 30 fathoms ('/2). Gulf of Rayong, 7—10 fathoms, sand, mud (*/2). 
Between Koh Chuen and Koh Mesan, 15 fathoms, mud (‘/2). S. of Koh Kahdat, 
8—10 fathoms, mud (‘/2). Koh Kahdat ('/2). S. of Koh Mak, 5—6 fathoms ('/2). 
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, 
! Journ. de Conchyl., IX, 1861, p. 46. 
