226 130 
Caecella Cumingiana, Desh. 
Cecella Cumingiana, DrsHayes, Proc. Zool. Soc. London, XXII, 1854, p. 334, No. 78. 
_ _— - HipaLco, Fauna malacolog. d. I. isl. Filipinas, H, p. 60, No. 123. 
Koh Chang (14). Coast of Koh Chang (1). 
Long. 10—26 mm. 
Distribution: — Philippines. 
I have at my disposal some specimens of C. Cumingiana, Desh., from the 
Philippines which were contributed by Cumine himself; they are somewhat larger 
than the specimens from the Gulf of Siam, but otherwise exactly correspond with 
them. The epidermis in the small individuals (measuring as much as 23 mm. in 
length) is pale yellow, while in older individuals it is brownish. It will undoubtedly 
be proved in the future that the series of species established by Desnayes of the 
genus Caecella, can be considerably reduced. 
Fam. Veneridae. 
Cytherea (Meretrix) meretrix L. 
Venus Meretrix, LinNi, Syst. Nat., ed. X, 1758, p. 686, No. 102. — ed. XII, p. 1132, No. 127. — Mus. Ludovicze 
Ulrice reg., p. 501, No. 60. 
Cytherea meretrix, LINNE, LiscHKE, Japanische Meeres-Conchylien, J, pp. 122—26. 
Meretrix — DAUTZENBERG et FiscHER, Journ. de Concbyl., vol. 53, 1905, p. 216. 
Venus lusoria, CHEMNITZ, Conchyl. Cabin., VI, 1782, p. 337, pl. 32, fig. 340. 
Meretrix — — Romer, Monogr. d. Molluskengatt. Venus, I, p. 30, pl. 12, fig. 1; pl. XI, figs. 1—2. 
Cytherea petechialis, LAManck, Hist. nat. d. anim. s. vert., V, 1818, p. 561, No.2. — éd. 2, VI, p. 299, No. 2. 
Meretrix - -- R6meEr, Monogr. d. Molluskengatt. Venus, I, p. 29, pl. 9, fig. 1. 
Venus zonaria, — Hist. nat. d. anim. s. vert., V, 1818, p. 562, No.5. — éd. 2, VI, p. 299, No. 5. 
—  impudica, — Hist. nat. d. anim. s. vert., V, 1818, p. 561, No. 3. — éd.2, p. 299, No. 3. 
North coast of Koh Chang (1). 
Long. 51 mm. 
Islands in the Gulf of Siam (M. petechialis, Lam. — L. Morver). “Siam” 
(M. impudica, Lam., M. zonaria, Lam. — E. v. MARTENS). 
Distribution: — Singapore, Salang (Malacca), Nicobars, Ceylon, Bombay, 
Aden. — Annam, Tonkin, China, Formosa, Japan, Liukiu Isls., Philippines, Borneo, 
Jaya, Timor, Moluccas. (“Mazatlan,’ CARPENTER; without doubt the determination 
is erroneous). 
The specimen from Koh Chang belongs to the form zonaria, Lam. The many 
different species which have been established by Lamarck and other authors on 
the basis of the present species, have for a long time rendered its determination 
difficult, and LiscuKe (loc. cit.) was the first to demonstrate, and that correctly, 
that all these forms belong to the same species. In spite of this, many later authors 
have persisted in maintaining the varieties as species, a view which is quite unten- 
able when larger series and specimens in various ages are at hand for investigation. 
