270 



Distribution: — C. [T.] transcendens was described from the Torres Straits. 



In the "Siboga" collection the species is represented by shells of ail âges from the reef 

 of Batjulmati, Java (St. 7), Anchorage off Pulu Sarassa, Postillon Islands (St. 43), St. 98 (6° 9' N., 

 i20°2i^E., 350 mètres), Banda Anchorage (St. 240), Tuai Anchorage, Kei Islands (St. 258), 

 Buka or Cyrus Bay, south coast of Rotti Island (St. 299), St. 310 (8° 30' S., i 19° 7'. 5 E., 73 mètres), 

 Anchorage east of Dangar Besar, Saleh Bay (St. 313) and Anchorage east of Sailus Besar, 

 Paternoster Islands (St. 315). 



6. Cardium- [Trac hy car diu?n) tinicolor Sowerby. 



1841. Cardiitut unicolor Sowerby, Proc. Zool. Soc. London (volume for 1840), p. 107. 



1841. Cardmui unicolor Sowerby, Conch. lUustr., p. 4, fig. 29. 



1843. Cardium Unicolor Hanley, Rec. Biv. Shells, p. 138, pi. XVII, fig. 35. 



1845. Cardium unicolor and C. nebulosinn Reeve, Conch. Icon., II, Cardium, pi. XVIII, fig. 88, 



pi. XIX, fig. 99. 

 1869. Cardium unicolor Romer in Martini-Chemn., Conch. -Cab. (N. F.), X (2), Cardiacea, p. 64, 



pi. IX, fig.s. 22 — 24. 

 1903. Cardium unicolor Hidalgo, Obras Malacol., II, p. 337. 

 1905. Cardium unicolor Hidcilgo, Cat. Filip., p. 345. 

 1928. Cardium unicolor Faustino, Summary Philippine Mar. Freshw. Mol)., p. 62. 



I hâve compared the type of C. {T.) îuiicolor and C. [T.) neà?i/osu;u and can find no 

 différences between the shells of the two species. The longitudinally ovate, suboblique, rather 

 solid and ventricose shell of this species is very différent from usual species of the subgenus 

 TrachycardiuDi. There are 44 — 48 rounded, regular radial ribs on the surface, but in ail the 

 shells, which I hâve seen, the sculpture is altogether worn -, only a fevv short tubercles are still 

 présent on the posterior most ribs. 



Distribution: — C. [T.) unicolor was described from the Philippines, but I hâve seen 

 typical shells of the species from the Maldives, and the species appears to be widely distributed 

 in the Indo-Pacific. 



In the "Siboga" collection it is represented from the Anchorage east of Dangar Besar, 

 Saleh Bay (St. 3 1 3). 



7. Cardhim [Trac hy car dmtn) beauforti sp. nov. (Plate VI, figs. 27, 28). 



This beautiful species, which I associate with the name of Dr. L. F. de Beaufort, Director 

 of Zoological Muséum, Amsterdam, is a very interesting species of the subgenus Trachycardiwn. 



The species is closely allied to C. [T.) unicolor^) Sowerby, but is easily distinguished by 

 its very elongately ovate shell-, the altitude of the shell is about 1Y3 times its length; the very 

 narrow and greatly arched hinge area, the very curved umbones and the regular radial sculpture. 

 Unfortunately ail the three shells of the species are rather worn and do not show the true 

 sculpture of the species. 



Measurement of Holotype: — length 27.5 mm., height 20 mm., diameter 17.8 mm. 



Habitat : — Three shells of this new species were dredged at the Anchorage off Lirung, 

 Salibabu Island (St. 133). 



i) See Reevé, L. — Conch. Icon., II, Cardium^ pi. XVIII, fig. 88 (1845). 



