269 



1905- Cardiiivi sîibriigosuin Hidalgo, Cat. E'""ilip., p. 345. 



191 1. Cardium subriigosnin Pelseneer, "Siboga" Lamellibranches (Anat.), p. 57. 



1928. Cardiinn siibrugosum Faustino, Summary Philippine Mar. Freshw. Moll., p. 62. 



Cardium ( Trachycardmni) stiôr^igos^im is very closely allied to C. ( T.) flavicm^ and may 

 be a form of this species. The shell of C. [T.) suôricgostim, however, is not so high, but is more 

 quadrate and more oblique. The ridges on the shells are more angulate, their scales less strongly 

 developed and more deHcate ; the posterior most ribs, further, are not so spinose. 



Distribution: — C. {T.) sziôrzigosum seems to be confined to the Southern Pacific Océan. 



Only a single spécimen of this species was collected by the "Siboga" Expédition at Dobo, 

 Aru Islands (St. 272). 



4. Cardiitm ( Trachycarditun) impolitum Sowerby. 



1840. Cardhtm impolitum Sowerby, Conch. Illustr., p. 4, figs. 6, 66. 



1841. Cardiinn impolitum Sowerby, Proc. Zool. Soc. London (vol. for 1840), p. 107. 

 1841. Cardmm impolitum Reeve, Conch. Syst., I, p. 98, pi. LXXIII, fig. 4. 



1843. Cardium Impolitum Hanley, Rec. Biv. Shells, p. 138, pi. XVII, fig. 53. 



1845. Cardium impolitum Reeve, Conch. Icon., II, Cardium, pi. XVI, fig. 80. 



1845. Cardium impolitum Catlow & Reeve, Conch. Nomencl., p. 43. 



1858. Cardium [Trachy cardium) impolitum Adams, H. & A., Gen. Rec. Moll., II, p. 455. 



1860. Cardium impolitum Reeve, Elem. Conch., II, p. 102. 



1869. Cardium [Trachycardium] impolitum Rômer in Martini-Chemn., Conch. -Cab. (N.F.), X(2), 



Cardiacea, p. 62, pi. XI, fig. 12. 

 1872. Cardium [Trachycardium) impolitum Tryon, Amer. Journ. Conch., VII, p. 262. 

 1884. Cardium impolitum Grasset, Ind. Test. Viv., p. 274. 



1890. Cardium [Trachycardium] impolitum Paetel, Cat. Conch. Samm., III, p. 115. 

 1906. Cardium [Trachycardium) impolitum Melvill & Standen, Proc. Zool. Soc. London, p. 837. 

 1909. Cardium [Trachycardium) impolitum Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat.- 



Math., (7) V, p. 257. 

 191 1. Cardium impolitum Pelseneer, "Siboga" Lamellibranches (Anat.), p. 57. 



Romer's description of C. [T.) impolitîtm is very complète, and he is correct in his surmise 

 that Sowerby and Reeve's descriptions were drawn up from worn shells. The sculpture of fresh 

 examples agrées with Romer's description. 



Distribution: — C. {T.) impolitum has been recorded from Karachi, Singapore, Gulf of 

 Siam, the China Sea and Tahiti. 



In the "Siboga" collection the species is represented by shells collected at Macassar 

 (St. 71) and Sapeh Bay, East coast of Sumbawa (St. 311). 



5. Cardium [Trachycardiuin] transcendens Melvill & Standen. 



1899. Cardium [Trachycardium) transcendens Melvill & Standen, Journ. Linn. Soc. London 



(Zool.), XXVII, p. 191, pi. XI, fig. 21. 

 1909. Cardium [Trachycardium) transcendens Melvill & Standen, Trans. Linn. Soc. London 



(Zool.), XIII, p. 133. 



The "Siboga" spécimens, which I assign to C. {T.) transcendens^ agrée with the description 

 and figure of the species in ail respects. The largest "Siboga" shell is 28.5 mm. high X 25.5 mm. 

 long, and has over 60 ribs. The shells are of a yellowish white colour with a network of flesh 

 coloured spots spread ail over on the inner surface of the valves. 



