160 THE VOYAGE OF II. M.S. CHALLENGER. 



This species is found at the Philippine Islands, on the east and west coasts of Australia, 

 and also on the shores of Tasmania. I fail to appreciate the distinctions pointed out by 

 Eeeve with regard to Cardium j^ctUidum and Cardium radiatvm. 



All the forms have exactly the same kind of epidermis, and diifer only in the amount 

 of colour and somewhat in outline. Some of the specimens from Port Jackson are very 

 pretty, having the riljs pinkish -red interrupted hy concentric pale irregular zones. 

 Other examples from Swan Piver are more or less suffused throughout with a pinkish 

 tint, the interior exhibiting a vivid purple-pink below the beaks. 



Cardium {Bucardium) an st rale, Sowerby. 



Cardium australc, Sowerby, Proc. Zool. Soc. Lond., IStO, p. 105. 

 Cardium ausfrale, Sowerby, Conch. 111., figs. 12, 12*. 

 Cardium, australe, Eomer, Conch.-Cab., ed. 2, p. 70, pi. xii. fiprp. 8, 9. 

 Cardium australe, Reeve, Conch. Icon., vol ii. pi. six. fig. 97. 

 Cardium jmlcJirum, Eeeve, loc. cit., fig. 98. 



Habitat. — Off Levuka, Fiji, in shallow water ; and Station 208, Philippine Islands, 

 in 18 fathoms. 



This species has already been recorded from the coasts of Australia and China, from 

 the Cape of Good Hope, the island of Kodriguez, and the Mauritius. Apparently it 

 never attains nearly so large a size as Cardium tenuicostatum, which it closely 

 resemliles in many respects. It is, however, rather higher in jDrojJortion to the length, 

 has more prominent iimbones, is narrower above, smoother, more glossy, differently 

 coloured, has stronger sculpture between some of the posterior riblets, which are not 

 carinate clown the middle, and it is not apparently adorned with an epidermis, judging 

 from the series of specimens which I have examined. 



A single .shell from Station 208 constitutes a peculiar variety, differing from the 

 jiormal form in being higher and narrower, and rather more finely and more numerously 

 costate anteriorly and upon the central portion of the valves. It is also remarkable in 

 having the umljo of the left valve stained purplish-red, that of the right being white. 



Cardium (Bucardimn) midtispinosum, Sowerby. 



Cardium multispinosum, Sowerby, Proc. Zool. Soc. Lond., 1840, p. 106. 



Cardium midtisjnnosum, Sowerby, Conch. 111., figs. 38, a, h. 



Cardium multispinosum, Hanley, Eec. Biv. Shells, pp. 137 and 3G3, pi. xvi. fig. 58. 



Cardium vmltispinosum, Eeeve, Conch. Icon., vol. ii. pi. ii. fig. 10. 



Cardium multispinosum, Roiner, Conch.-Cab., ed. 2, p. 67, pi. xii. figs. 1, 2. 



Habitat. — Stations 188 and 189, both west of Cape York, North Australia, at dephs 

 of 28 and 25 fathoms ; green mud. 



