323 



margin is also a little more oblique, and the shells are larger. The différences, however, are not 

 sufficient to justify the séparation of the "Siboga" spécimens as a separate species or even a variety. 



Distribution: — C. (C) elongatum has been recorded from the China Sea; near Bornéo 

 coast; FHnders Passage, North Australia and the Gulf of Siam. 



The "Siboga" shells were dredged on the Bank between the islands of Bahuluwang and 

 Tambolung-an, south of Saleyer (St. 66), Banda Anchorage (St. 240) and Rumah Kuda Bay, 

 Roma Island (St. 279). 



2. Calopodnim {Kennerlià) carinatum sp. nov. (Plate VII, figs. 15 — 18). 



The following is a description of this new species : — Species of a small size ; shell 

 oblique, arched, thin ; right valve almost flat, radially grooved, also bearing a few concentric 

 lines of growth ; left valve very convex ; acuminate antero-dorsally, drawn out irito almost a point, 

 gradually curving down into greatly arched ventral margin, posterior margin subtruncate, dorsal 

 margin almost straight, umbonal area slightly projecting above the hingeline, a low ridge cutting 

 off anterior dorsal area running down to ventral margin in front of umbo, and a very strongly 

 marked posterior keel running to posterior margin ; concentric sculpture consisting of low 

 thread-like ridges. Shell of a horny colour. 



Measurements of Holotype: — Length 7 mm., height 5.5 mm., diameter 2 mm. 



Habitat: — Two shells of this interesting species were dredged at St. 159 (o°59'. i S., 

 i29°48'.8E., 411 mètres). 



Remarks: — C. {K.) carinatum is allied to C. {K.) radiatum Sowerby ^), but the shell 

 is more oblique, less rostrate and more inflated, and the sculpture is less strongly developed. 



Family Verticordiidae. 

 Xjenus Verticordia Sowerby. 



1844. Verticordia Sowerby, Man. Conch., VII, p. G'j , pi. DCXXXIX. 



1860. Verticordia Seguenza, Journ. Conchyliol., VIII, p. 286. 



1885. Verticordia Smith, "Challenger" Lamellibranchia, p. 165. 



1887. Verticordia Fischer, P., Man. Conchyliol., p. 1160. 



1903. Verticordia Dali, Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 1509. 



1925. Verticordia Woodring, Miocène Mollusks from Bowden, Jamaica, Pelecypods etc., p. 91. 



For a discussion of the genus Verticordia référence may be made to Smith and Dall's 

 Works cited above, while a good description of the genus was recently published by Woodring. 



The génotype is Verticordia cardiiformis Sowerby, I am not certain about the subgeneric 

 position of the new species V. expansa^ and probably when more material is available it may 

 hâve to be separated into a distinct subgenus. 



I . Verticordia ( Verticordia^ deshayesiana P. Fischer. 



1862. Verticordia Deshayesiana Fischer, P., Journ. Conchyliol., X, p, 35, pi. V, figs. 10. 11. 

 1862. Verticordia Japonica Adams, A., Ann. Mag. Nat. Hist., (3) IX, p. 224. 



i) See Sowerby, G. B., in Reeve, Conch. Icon., XIX, Pandora^ pi. II, fig. g (1874), 



