260 164 
of their epidermis, which takes the form of very thin, short, irregular yellowish 
lamelle arising from the radiating striz.” In the specimens from the Gulf of Siam 
this epidermis is found especially upon the front and hinder sides of the valves; in 
addition, there is present especially upon the posterior end, slight remnants of 
epidermis between the radiating ribs. Metvitt and STANpdEN! consider C. tenui- 
costatum, Lam. to be a variety of C. Australe, Sow. 
Cardium (Laevicardium) lobulatum, Desh. 
(Pl. V, Figs. 16-19). 
Cardium lobulatum, DesHayes, Proe. Zool. Soc. London, XXII, 1854, p. 332, No. 68. 
At Koh Kahdat, 1-10 fathoms, sand and mud (14). South of Koh Mak, 5-6 
fathoms (2). 
Long. 23 mm., alt. 26 mm. 
Distribution: — Maldive Archip. — Philippines. . 
I owe thanks to Mr. Epc. Smirn for the determination of the present species. 
Hemicardium (Lunulicardia) retusum L. 
Cardium retusum, Linné, Systema Naturae, ed. XII, 1767, p. 1121, No. 75. 
— — MartTINI u. CHEMNITZ, Conchyl. Cabin., X, 2 Abth., p. 118, pl. VI, figs. 1—4. 
- - Linné, Reeve, Conchol. icon., Il, Cardium, Sp. 103. 
— subretusum, SOWERBY, REEVE, Conchol. icon., II, Cardium, Sp. 100. 
Several (23) specimens taken between Cape Liant and Koh Kut, 1—15 fathoms, 
sand, gravel and mud. 
The specimens are all small, the largest specimen is 23 mm. broad. 
Distribution: — Bay of Bengal, India (Madras), Ceylon, Gulf of Manaar, 
Red Sea, Suez Canal (“rare” M’ ANDREW, Cooke), Seychelles, Réunion, Zanzibar. — 
Philippines, Torres Strait. 
The records of the different authors concerning the distribution of this species 
to China (vy. MARTENS, REEVE, and others) and Japan (DuNKER, and on his authority 
Pitssry) are open to doubt, neither LiscHkeE (Japan. Meeres Conchylien) nor P. FiscHER 
(Catalogue d. Moll. de Indo Chine) mention this species from these regions. 
Hemicardium (Fragum) unedo L. 
Cardium unedo, LinNE, Syst. Nat., ed. X, 1758, p. 680, No. 68. 
~ Mus. Ludovic Ulric reg., 1764, p. 488, No. 40. 
Reeve, Conchol. icon., Il, Cardium, Sp. 13. 
— - Martini u. CHemnitz, Conchyl. Cabin., X, 2 Abth., p.101, pl. 4, figs. 11—12. 
Hemicardia unedo, Linné, L. Morter, Journ. de Conchyl., vol. 37, 1889, p. 168, No. 58. 
At Koh Kahdat, 1—5 fathoms, sand (14). 
Islands in the Gulf of Siam (Moret). 
Long. 6—8 mm. 
1 Proc. Zool. Soc. London, 1906, p. 837. 
