28o 



l8ig. Cardium biradiatuni Lamarck, Anim. sans Vertèb., VI, fig. 8. 



1824. Cardiitiii biradiatiiui Dubois, Epitome, p. jj. 



1825. Cardium biradiatiiin Sovverby, Cat. Tankerville, p. 17. 



1835. Cardium biradiatum Deshayes in Lamarck, Anim. sans Vertèb., VI, p. 404. 



1840. Cardiinn biradiatum Pfeiffer, Krit. Reg., p. 60. 



1841. Cardium biradiatum Sowerby, Concli. Illustr., p. 5. 



1843. Cardium Biradiatmn Hanley, Rec. Biv. Shells, p. 133, pi. XVII, fig. 2. 



1844. Cardium biradiatum Reeve, Conch. Icon., II, Cardium, pi. X, fig. 49. 



1845. Cardium biradiatum Catlow & Reeve, Conch. Nomencl., p. 42. 



1857. Cardium {Laevicardium) biradiatum Adams, H. & A., Gen. Rec. Moll., II, p. 457. 



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



1869. Cardium biradiatum von Martens, von d. Deckens Reise, p. 66. 



1869. Cardium [Laevicardium) biradiatum Romer in Martini-Chemn., Conch. -Cab. (N. F.), X {2), 



Cardiacea.^ p. %■], pi. III, figs. 5, 6. 

 1872. Cardium [Laevicardium] biradiatum Tryon, Amer. Journ. Conch., VII, p. 268. 

 1880. Cardium biradiatum von Martens, Môbius Beitrage Meeresf. Mauritius, Seychell., p. 323. 

 1884. Laevicardiu7ii biradiatum Grasset, Ind. Test. Viv. p. 276. 

 1886. Cardium biradiatum Cooke, Ann. Mag. Nat: Hist., (5) XVIII, p. 97. 

 1890. Cardium [Laevicardium) biradiatum Paetel, Cat. Conch. Samm., III, p. 118. 

 1899. Cardium [Laevicardium) biradiatum Melvill & Standen, Journ. Linn. Soc. London Zool., 



XXVII. p. 192. 

 1901. Laevicardium biradiatum Sturany, Denkschr. Kais. Akad. VViss. Wien, Math. -Nat., LXIX, 



p. 283. 

 1903. Cardium [Laevicardium) biradiatum Smith, Faun. Geogr. Maldive, Laccadive Archipel., 



II, p. 625. 

 1903. Laevicardium biradiatum Hidalgo, Obras Malacol., II, p. 349. 

 1905. Laevicardium biradiatum Hidalgo, Cat. Filip., p. 346. 



1909. Cardium [Laevicardium) biradiatum Melvill, Trans. Linn. Soc. London (Zool.), XIII, p. 134. 



1910. Cardium biradiatum Hedley, Austral. Ass. Adv. Sci. XII, p. 348. 



191 1. Cardium biradiatum Lamy, Bull. Mus. d'Hist. Nat. Paris, XVIII, p. 132. 

 191 1. Cardium biradiatum Pelseneer, "Siboga" Lamellibranches (Anat.), pp. 55, 56. 



19 17. Cardiinn [Laevicardium] biradiatum Odhner, Kungl. Svensk. Akad. Handl., LU, N° 16, p. 28. 

 1928. Cardium [Laevicardium] biradiatum Faustino, Summary Philippine Mar. Freshvv. Moll., p. 62. 



The characteristic pink rays radiating from the umbones on the inside of the shell, and 

 in référence to which the species was named biradiahim^ are not always well marked. The 

 species can, however, be easily recognised by its comparatively very narrow and greatly arched 

 hinge and notwithstanding the low radiating ridges on the surface an almost smooth shell. 



Distribution : — C. (Z.) biradiatum is vvidely distributed in the Indo-Pacific, and has 

 also been recorded from the Red Sea. 



In the "Siboga" collection it is represented by spécimens collected at the reef of Batjulmati, 

 Java (St. 7), Anchorage off Pulu Sarassa, Postillon Islands (St. 43), Anchorage off North Ubian 

 (St. 99), Banda Anchorage (St. 240), Anchorage east of Dangar Besar, Saleh Bay (St. 313) and 

 Anchorage east of Sailus Besar, Paternoster Islands (St. 315). 



23. Cardiîim {Laevicardmvi) australe Sowerby. 



1834. Cardium Australe Sowerby, Conch. Illustr., p. i, figs. 12, 12*. 



1841. Cardium Australe Sowerby, Proc. Zool. Soc. London (vol. for 1840), p. 105. 



1841. Cardium australe Reeve, Conch. Syst., I, p. 99, pi. LXXV, figs. 12, 12*. 



1843. Cardium Australe Hanley, Rec. Biv. Shells, p. 135, pi. XVII, fig. 37. 



