160 64 
older individual of L.squamosa, Lam., in which have developed, between some of 
the central ribs towards the ventral margin, very slight indications of a rib; the 
lines of growth also are somewhat prominent; these being individual characters, 
the form can by no means be maintained as a variety. 
Fam. Ostreidae. 
Ostrea cucullata, Born. 
Ostrea cucullata, Born, Testacea Musei Czesarei Vindobon., 1780, p. 114, pl. VI, figs. 11—12. 
var. Barclayana, Sowerby. 
Reeve, Conchol. icon., XVIII, 1871, Ostraa, Sp. 77. 
Koh Chang, on stones at the strand (many specimens). Coast of Lem Ngob (2). 
Coast of Koh Kahdat (1). 
Long. 35 mm., alt. 42 mm. 
var. Forskali, Chemnitz. 
Conchyl. Cabin., VII, 1785, p.50, pl. 72, fig. 671. 
South of Koh Chuen, 30 fathoms, shells (‘/2). Coast of Koh Chang (2). 
Long. 37 mm., alt. 55 mm. 
“Bangkok” (Coll. DAUTZENBERG). 
Young individuals of both forms were found in several places in the Gulf of 
Siam. Ed. y. MarreNs records! that he has taken numerous specimens of O. cucullata, 
Born, at Bangpra in the Gulf of Siam. 
Distribution: — Salanga, Mergui Archip., Nicobars, Ceylon, Bombay, Persian 
Gulf, Gulf of Aden, Red Sea, Suez, Mozambique, Querimba Isls., Mascarenes, coast 
of Natal, Ascension Isl. — Poulo Condor, Cochin China, China, Formosa, Loo-Choo 
Isls., Japan, Philippines, Sumatra, Moluccas, Timor, Thursday Isl., Mast Head Reef 
(Queensland), South Australia (? ANGAS), Viti Isls., New Zealand. 
Desnayes,” characterizes this oyster very correctly when he says that it “aurait 
mérité le nom de multiformis” because its variability is exceedingly great, and 
consequently, as may be expected, it has an endless number of synonyms;* to 
these the following, besides many others, may doubtless be added: — O. circumsuta, 
Gould,! O. attenuata, Sow.,’ and perhaps O. vilrefacta, Sow.* Specimens of O. cucul- 
1 Zoolog. Ergebnisse ein. Reise in Niederl. Ost-Indien hrsg. v. M. WEBER, IV, 1897, p. 223. 
2 Catal. d. Mollusques de Vile de la Réunion, 1863, p. 36. 
5 For further details cf. PAGENSTECGHER, Ueber d. v. R. KossMANN am Rothen Meere gesamm. Mol- 
lusken, 1877, pp. 16—24. — Srurany, Lamellibranchiaten d. Rothen Meeres, 1899, p.37. — Liscukkr, Japanische 
Meeres Conchyl., I, p. 161. — Cooxr, Ann. and Magaz. Nat. Hist., Ser.5, vol. 17, p. 134. 
4 Goutp, Unit. States Explor. Expedit., pl. 43, fig. 576. — Rrrve, Conchyl. Cabin., XVII, Ostrea, 
Sp.64.. Why Reeve records “Massachusetts?” as its habitat is difficult to understand, as GouLp (Proc. 
Boston Soc. of Nat. Hist., 1850, p. 346) says that his species was found in the “Feejee and Samoa Is- 
lands.” AnGas (Proc. Zool. Soc. London, 1867, p. 934) records it from Botany Bay. 
®* REEVE, loc. cit. Sp. 49. 
© Reeve, loc. cit. Sp. 80 
