838 MESSRS. MELVILL AND STANDKX ON [Nov. 13, 



Cahdium (Acanthocardia) asiattcum Chemn. {=^coronaiuiii 

 Speiigler). 



I. Ivarachi (^F. W. T. and Major Baker ; the hitter us Jinibriatiivi 

 Wood). Bombay [Ahercrombie). Bombay Harbour, southwards 

 to Ratnagiri, Panjim, and Goa {Lt.-Col. H. D. Olivier). 



After detailed examination of many examples in all stages of 

 gi'owth, it is the opinion of Mr. Alexandei' Aberci'ombie that 

 corovatum Spenglei' is synonymous. 



Cardium (Acanthocardia) exochum* Melvill,sp. n. (Plate LIII. 

 %-6.) 



C. testa parva, incequilaterali, fere roianda, iKillide straminea 

 velsalmonea; valvis convexis, cequalihus, solidulis ; tdinhonibus 

 ohliquis contignis vix proviimdis, latere antico rotimdato, 

 posiico obscure quadratulo, salmoneo-tincio, margine ventrali 

 7-ot'undccto, dorsali utrinque leniter dejiexo ; costulis radiantibus 

 numero ad 35, pidcherrirae et arete imbricato-squaniosis, 

 inter stitiis siib lente angustissimis, unisulculosis, d'uobus 

 dentibus cardinalibtis in utraque valva prcedita, lateralibibs 

 parvis ; pagina interna alba, postice salmoneo-tinctq, margine 

 jndchre serridato. 

 Alt. 9, lat. 8, diavi. 8 mm. 

 Hab. P.G. Thairi. 



Allied to the larger C. sueziense Issel, but more globular and 

 highly coloured, and with close imbricating scales. Also resembling 

 somewhat in form, though not altogether in sculptui-e, the recently 

 described C. gilchristl Sowb.t, from South Africa. The squamse 

 are all of the same charactei-, closely imbiicated and latticed. In 

 form it is roundly convex, peculiarly stained both without and 

 within posteriorly with salmon-pink, being a most refined and 

 delicate species. 



Cardium (Acanthocardia) omanense Melvill, sp. n. (Plate LIII. 

 fig. 5.) 



0. testa parva, fere rotunda^ iticequdaterali, albida; umbonibus 

 subpro7nimdis, elevaiis, contiguis; valvis subconvexis, wqualibus, 

 solidis, lateribus antice, sivnd ac postice, rotundatis, latere 

 postico superne obscure quadrattdo, costis radiantibus ad 25, 

 crassis, nodtdis squamosis consjyicuis prceditis, inter stitiis angus- 

 tissimis, sitb lente cancellatis ; pagina interna alba, cardine 

 normali. 



Alt. 5, lat. 5'50, diam. 3 rjim. {sp. nutj.). 



Hab. Persian Gulf: Gulf of Oman. Lat. 24° 58' N., long. 

 56° 54' E. ; 156 fathoms, shell-sand. 



A small species, with libs coarse proportionately speaking to the 



* iiS,oxos, prominently distinguished. 



f 'Marine Investigation in South Africa.' Molhisca by G. B. Sowerby, p. 11, 

 pi. vii. fig. 1. 



