CARD IT A. 



Plate IX. 



Species 42. (Mus. Cuming.) 

 Cardita concamerata. Card, testa ovato-oblongd, ra- 

 diatim costatd, costis nodulosis, subirregularibus ; 

 valvis planiusculis, camerd parvd vel pocillo interne 



munitis. 

 Phe chambered Cardita. Shell ovately oblong, ra- 



diately ribbed, ribs nodulous and rather irregular ; 



valves flattish, furnished internally with a small 



cup or chamber. 

 Bruguiere, Enc. Meth. vers, vol. i. part 2. p. 409. 



Chama concamerata, Chemnitz. 

 Hab. Cape of Good Hope (found under stones). 



The curious internal cup-like structure which is pe- 

 culiar to this species is formed by a fold of the calca- 

 reous lining of the valve, and it has been ascertained 

 by Mr. Sowerby to be destined to contain the ovaries. 

 '■The eggs," says that author, "appear to remain in them 

 until they are perfectly developed and ready to disclose 

 the complete animal with its shell. 



Reeve, Pro. Zool. Soc, 1843. 

 Hab. Sicily ? 



This shell may be recognised by the compressed cha- 

 racter of the ribs, and the very regular manner in which 

 they are noduled. 



Species 43. (Mus. Cuming.) 



(Figure considerably magnified.) 

 Cardita semen. Card, testa ovatd, subcompressd, tend, 

 radiatim costatd, costis plano-convexis ; olivaceo- 



fuscd. 

 The seed Cardita. Shell ovate, somewhat compressed, 

 thin, radiately ribbed, ribs flatly convex; olive- 

 brown. 

 Reeve, Pro. Zool. Soc, 1843. 



Hab. Mexillones, Desert of Atacama, Bolivia (found at 

 the depth of three fathoms) ; Cuming. 

 This minute species is the smallest of the genus ; it 

 looks like a little radiated seed. 



Species 44. (Mus. Cuming.) 

 Cardita nodulosa. Card, tcstd ovatd, solidd, radiatim 

 costatd, costis duabus vel tribuset viginti, compressis, 

 regulariter nodulosis ; lutescente-albd, prope rnargi- 

 nem aurantio tinctd. 

 The nodulous Cardita. Shell ovate, solid, radiately 

 ribbed, ribs two or three and twenty in number, 

 compressed, regularly noduled ; yellowish white, 

 stained near the margin with orange. 



Species 45. (Mus. Cuming.) 

 (Figure considerably magnified.) 

 Cardita naviformis. Card, testa trapezio-ovatd, sub- 

 compressd, latere postico elongato-recto ; radiatim 

 costatd, costis paululum curvatis, squamosis ; fusees- 

 cente. 

 The boat-shaped Cardita. Shell trapeziformly ovate, 

 somewhat compressed, posterior side elongately 

 straight; radiately ribbed, ribs a little curved, 

 scaly ; brownish. 

 Reeve, Pro. Zool. Soc, 1S43. 



Hab. Valparaiso, South America (dredged from sandy 

 mud at the depth of twenty-five fathoms) ; Cuming. 

 The shape of this little species is peculiar, though it 

 approaches in great measure to that of the C. trapezia. 



Species 46. (Mus. Cuming.) 

 (Figure considerably magnified.) 

 Cardita compressa. Card, tcstd suborbiculari, solidd. 

 vald'e compressa, epidermide olivaced indutd; radia- 

 tim costatd, costis lavibus, planiusculis, interstitiis 



angustis. 

 The compressed Cardita. Shell nearly orbicular, 

 solid, very compressed, covered with an olivaceous 

 epidermis; radiately ribbed, ribs smooth, rather 

 flat, interstices between them very narrow. 



Reeve, Pro. Zool. Soc, 1843. 



Hab. Valparaiso, South America (dredged from coarse 

 sand at the depth of from twenty to sixty fathoms) ; 

 Cuming. 

 Several specimens of this little species were found by 



Mr. Cuming at the great depth above-mentioned ; it has 



the appearance of the C. borealis in miniature. 



Species 47. (Mus. Cuming.) 



(Figure considerably magnified.) 



Cardita flabellum. Card, testa flabelliformi, radia- 



September 1843. 



