268 



species which has been described under the names C.magnuin Chemnitz (non Born), C.pectini- 

 forme Born, C. regulare Bruguière, C. rugosum Lam., C. peregri?iu7n Jousseaume and probably 

 C. dupuchense Reeve ^). Cardnim rugosum as figured by Reeve in the "Conch. Icon." — pi, XIV, 

 fig. 68 — is a distinct species, and was described by Dunker ^) under the name C. reeveanum. 



Distribution: — C. [T.) flavuiu has a very wide range in the Indo-Papicific, and has 

 also been recorded from the Red Sea and the Persian Gulf. 



In the "Siboga" collection the species is represented by a good séries of shells collected 

 in the Bay of Labuan Tring, Lombok (St. 19), Pulu Sanguisiapo, Tawi Tawi Islands (St. 93), 

 Sanana Bay, east coast of Sula Besi (St. 193), Saleyer Anchorage (St. 213) and West side of 

 Taam Island (St. 252). 



2. Cardùun {Trachycardiuni) sewelli sp. nov. (Plate VI, figs. 25, 26). 



This beautiful species, which I associate with the name of my chief, Lt. Col. R. B. Seymour 

 Sewell, Director, Zoological Survey of India, Indian Muséum, Calcutta, is closely allied to 

 Cardium [Trachycardiuni] jlavum Linn. It is distinguished, however, by the shell being much 

 more quadrate, the anterior ventral and posterior margins almost straight, the umbones neither 

 so prominent nor so convex, the shell more ventricose, and the number of radial ridges as many 

 as 38 as against 28 — 30 in C. [T^j jlavum. The ridges further are ail ornamented with beautiful 

 scales, which increase in size from the umbonal area to the ventral mar^in. The grrooves between 

 the ridges are also covered with minute scales. 



Measurements of Holotype: — Length 31 mm., height 28.5 mm., diameter 21.8 mm. 



Habitat : — The unique Holotype was dredged at the Anchorage off Lirung, Salibabu 

 Island (St. 133). 



3. Cardium. [Trachycardiîwi) sîibrtigosuni Sowerby. 



1838. Qardmm sîibnigosum Sowerby, Conch. Illustr., p. 5, figs. 32, 34. 



1841. Cardium sabnigosiDn Sowerby, Proc. Zool. Soc. London (vol. for 1840), p. 108. 



1843. Cardium Subrugosnm Hanley, Rec. Biv. Shells, p. 140, pi. XVII, fig. 20. 



1844. Cardiinii subrugosnm Reeve, Conch. Icon., II, Cardium, pi. XI, fig. 55. 



1845. Cardium subrugosum Catlow & Reeve, Conch. Nomencl., p. 45. 



1857. Cardium [Tr a chy cardium) subrugosum Adams, H. & A., Gen. Rec. Moll., II, p. 455. 



1858. Cardium subrugosum Fischer, P., Journ. Conchyliol., VII, p. 338. 

 1860. Cardium subrugosum Reeve, Elem. Conch., II, p. 103. 



1869. Cardium subrugosum Frauenfeld, Verhandl. Zool. Bot. Ges. Wien, XIX, p. 883. 

 1869. Cardium [Trachycardium] subrugosum Dunker. Cat. Mus. Godeffroy, IV, p. 112. 

 1869. Cardium [Trachycardium] subrugosum Rômer in Martini-Chemn., Conch. -Cab. (N. F.), 



X (2), Cardiacea, p. 53. 

 1872 Cardium [Trachycardium) subrugosum Tryon, Amer. Journ. Conch., VII, p. 263. 

 1884. Cardium subrugosum Brazier, Proc. Linn. Soc. N. S. Wales, IX, p. 801. 

 1884. Cardium subrugosum Grasset, Ind. Test. Viv., p. 275. 



1890. Cardium [Trachycardium) subrugosum Paetel, Cat. Conch. Samm., III, p. 117. 

 1896. Cardium [Trachycardium) subrugosum Casto de Elera, Cat. Sist. Filip., p. 772. 

 1903. Cardium subrugosum Hidalgo, Obras Malacol., II, p. 334. 



i) Reeve, L. — Conch. Icon., II, Cardium., pi. XIV, fig. 67 (1845). 



2) Dunker, W. — Zeitschr. Malakozool. IX, p. 54 (1852) and Novitat. Conch., Meeiesconch., p. 22, pi. VI, figs. 6 — 8 (1859). 



