260 164 



of their epidermis, which takes the form of very thin, short, irregular yellowish 

 lamellæ arising from the radiating striæ." 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. Melvill and Standen '■ consider C. tenui- 

 costatum, Lam. to be a variety of C. Australe, Sow. 



Cardium (Laevicardium) lobulatum, Desh. 



(PI. V, Figs. 16-19). 

 Cardium lobulatum, Deshayes, Proc. Zool. Soc. London, XXII, 1854, p. 332, No. 08. 



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: — Mnldive Archip. — Philippines. 



I owe thanks to Mr. Edg. Smith for the determination of the present species. 



Hemicardium (Lunulicardia) retusum L. 



Cardium retnsum, Linné, Systema Naturae, ed. XII, 1767, p. 1121, No. 75. 



— ~ Martini u. Chemnitz, Conchyl. Cabin., X, 2 Abth., p. 118, pi. VI, figs. 1 — 4. 



— — Linné, Reeve, Concliol. icon., II, 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, 

 Bed Sea, Suez Canal ("rare" M' Andrew, Cooke), Seychelles, Béunion, Zanzibar. — 

 Philippines, Torres Strait. 



The records of the different authors concerning the distribution of this species 

 to China (v. Martens, Beeve, and others) and Japan (Dunker, and on his authority 

 Pilsbry) are open to doubt, neither Lischke (Japan. Meeres Conchylien) nor P. Fischer 

 (Catalogue d. Moll, de ITndo Chine) mention this species from these regions. 



Hemicardium (Fragum) unedo L. 



Cardium unedo, Linné, Syst. Nat., ed. X, 1758, p. 680, No. 68. 



— — — Mus. Ludovicæ Ulricæ reg., 1764, p. 488, No. 40. 



— — — Reeve, Conchol. icon., II, Cardium, Sp. 13. 



— — — Martini u. Chemnitz, Conchyl. Cabin., X, 2 Abth., p. 101, pi. 4, figs. 11-12. 

 Hemicardia unedo, Linné, L. Morlet. Journ. de Conchyl., voL 37, 1889, p. 168, No. 58. 



At Koh Kahdat, 1—5 fathoms, sand (14). 

 Islands in the Gulf of Siam (Morlet). 

 Long. 6—8 mm. 



' Proc. Zool. Soc. London, 1906, p. 837. 



