277 



iS/O. Heuiicardia {Ctenocardia) fornicatum MacAndrew, Ann. Mag. Nat. Hist., (4) VI, p. 447. 



1872. Hemicardia [Fragum] fornicata Tryon, Amer. Journ. Conch., VII, p. 271. 



1884. Heviicardmm Adamsi and H. formicatuni (sic) Grasset, Ind. Test. Viv., pp. 276, 277. 



1885. Cardunn {Fragum) fornicatum Smith, "Challenger" LamelHbranchia, p. 164. 



1886. Cardium fornicatum Cooke, Ann. Mag. Nat Hist., (5) XVIII, p. 98. 



1890. Hemicardium [Ctenocardia'^ fornicatum Paetel, Cat. Conch. Samm., III, p. 119. 



1897. Cardium Adamsi Sovverby, Mar. Shells S. Africa, Supplément, p. 25. 



1899. Hemicardium [Ctenocardium) fornicatum Melvill & Standen, Journ. Linn. Soc. London 



(ZooL), XXVII, p. 193. 

 1901. Cardium fornicatum Sturany, Denkschr. Kais. Akad. Wiss. Wien, Math. -Nat., LXIX, 



p. 283. 

 1903. Cardium [Ctenocardia] fornicatum Smith, Faun. Geogr. Maldive, Laccadive Archipel., 



II, p. 625. 

 1906. Hemicardium [Ctenocardium) Adamsi Melvill St Standen, Proc. Zool. Soc. London, p. 840. 

 1906. Cardium fornicatum Smith, Ann. Mag. Nat. Hist., (7) XVIII, p. 262. 

 1909. Cardium [Ctenocardium) fornicatum Melvill, Trans. Linn. Soc. London (Zool.), XIII, p. 135. 



1909. Hemicardium [Ctenocardium) fornicatum Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat.- 



Math., (7) V, p. 261. 



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



As Smith and Lynge hâve pointed out, C. adamsii Adams & Reeve and C. virgo Reeve 

 are both synonyms of C. (C) fornicatum. Smith remarked on the peculiar sculpture of the 

 species, but as Lynge pointed out it is often impossible to distinguish shells of this species from 

 those of C. (C) imbricatum SowQvhy =z perornatum (Iredale). I hâve examined a number of shells 

 of both the species and find that the spines of C. (C.) fornicatum are much finer and more 

 closely pressed against the ridges, v^hile those of C. (C) perornatum are more distantly placed, 

 comparatively larger and better developed. 



Distribution: — C. {^C^ fornicatum is widely distributed in the Indo-Pacific, and has also 

 been recorded from the Red Sea. 



In the "Siboga" collection it is represented by spécimens collected in the Bay of Bima 

 (St. 47), Bay of Badjo, west coast of Flores (St. .50), Haingsisi, Samau Island, Timor (St. 60), 

 Anchorage off North Ubian (St. 99) and Sulu Harbour, Sulu Island (St. 104). 



17. Cardiîtm [Ctenocardia] translatum nom. nov. 



1845. Cardium rigidum Reeve (non Wood '), Conch. Icon., II, Cardium, pi. XX, fig. 105. 



Reeve's figure of C. rigidum is so entirely différent from that of Wood, that there is 

 every reason to doubt whether Reeve's figure and description of the species was based on 

 Wood's spécimens of the species. The form of the shell, the number of ribs and the sculpture 

 are so différent in Reeve's species, that I consider it quite distinct from Wood's rigidzim and 

 propose for it the name Cardium, [Ctenocardium^ translattim. 



There are in ail 32 — 38 radial ribs on the shells of this species and the scales on the 

 ribs resemble those of C. [C.) fornicatum Sowerby. 



Distribution : — The habitat of Reeve's types of the species was not know. The two 

 valves in the "Siboga" collection vi^ere collected in the Bay of Bima (St. 47). 



i) Wood, W. — Gen. Conch., p. 236, pi. LVII, figs. 2, 3 (181 5). 



