164 THE VOYAGE OF H.M.S. CHALLENGER. 



Cardium (Fragum) fornicatum, Sowerby. 



Carditim foy-nicatum , Sowerby, Proc. Zool. Soc. Loud., 1840, p. 110. 

 Cardium fornicatum, Sowerby, Concb. 111., fig. 48. 

 Cardium fornicatum, Eeeve, Conch. Icon., pi. xx. fig. 110. 

 Cardium adamsii, Eeeve, Voy. " Samarang," p. 77, pi. xxii. fig. 2. 



Habitat. — Station 172, ofl'Nukalofa, Tongatabu, in 18 fathoms ; coral mu<l. 



This charming species was obtained off the Bornean coast during the voyage of the 

 " Samarang." It is easily recognised by the numerous slender costellaj, which are most 

 beautifully adorned with very numerous short hollow spines. 



Cardium (Fragum) imbricatum, Sowerby. 



Cardium imbricatum, Sowerby, Proc. Zool. Soc. Loud., 1840, p. 110. 

 Cardium imbricatum, Sowerby, Conch. 111., fig. 48. 

 Cardium imbricatum, Eeeve, Conch. Icon., vol. ii. fig. 28. 



Habitat. — Off Cape York, North Australia, in 3 to 12 fathoms (Challenger)'; Swan 

 River, West Australia (Sowerby). 



Cardium (Fragum) torresi, n. sp. (PL VIII. figs. 4-46). 



Testa parva, paulo in^quilateralis, mediocriter globosa, tenuis, albida, radiatim 

 tenuissime costellata, hie illic radiatim granulata, et liris transversis crebris inter costeUis 

 cancellata. Umbones magni, prominentes, paulo ante medium collocati. Latus anticum 

 rotundatum, posticum subquadratum, inferne subangulatum. 



This is a very beautiful little shell, and readily recognised by its remarkable 

 sculpture. It is a little longer than high, rather ventricose, slightly inequilateral, white, 

 thin, and very beautifully sculptured with about seventy very fine thread-like radiating 

 lines, separated by equally fine grooves which have very numerous cross-bars producing 

 a punctured appearance. These cross-bars do not form a concentric series, but are 

 irregularly disposed, and, like the costellse, are obsolete on the dorsal areas. In addition 

 to this ornamentation the valves are further adorned with radiating series of small 

 tubercles or blunt spines which fall not upon the costse as usual, but in certain of the 

 interstices at rather unequal distances apart. 



The anterior side is a trifle shorter than the posterior, and broadly rounded, as is also 

 the lower margin. The hinder side is slightly narrower than the front, and more or less 

 truncated, joining the ventral outline at a slight angle. The umbones are fairly 



