Zoological Society. 307 



cut interstices between the ribs, which are unusually flat towards 

 the margin. 



Cardita semen. Card, testd ovatd, subcompressd, tenui, radiatim 



costatd, costis plano-convexis ; olivaceo-fuscd. 

 Conch. Icon., Cardita, pi. 9. f. 43. 



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. 



Cardita nodulosa. Card, testd ovatd, solidd, radiatim costatd, 

 costis duabus vel tribus et viginti, compressis, regulariter nodu- 

 losis; lutescente-albd, prope marginem aurantio tinctd. 

 Conch. Icon., Cardita, pi. 9. f. 44. 

 Hab. Sicily ? 



This shell may be recognized by the compressed character of the 

 ribs, and the very regular manner in which they are noduled. 

 Cardita naviformis. Card, testd trapezio-ovatd, subcompressd, 

 latere postico elongato-recto ; radiatim costatd, costis paululilm 

 curvatis, squamosis ; fuscescente. 

 Conch. Icon., Cardita, pi. 9. f. 45. 



Hab. Valparaiso, South America (dredged from sandy mud at the 

 depth of twenty-five fathoms) ; Cuming. 



Cardita compressa. Card, testd suborbiculari, solidd, valde com- 

 pressd, epidermide olivaced indutd ; radiatim costatd, costis Icevi- 

 bus, planiusculis, interstitiis angustis. 

 Conch. Icon., Cardita, pi. 9. f. 46. 



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. 



Cardita flabellum. Card, testd Jlabelliformi, radiatim costatd, 



costis leviter serratis; olivaceo-fuscd. 

 Conch. Icon., Cardita, pi. 9. f. 47. 

 Hab. Valparaiso, South America ; Cuming. 



The peculiar fan-shape of this minute species distinguishes it in 

 an eminent degree from any hitherto described. 



Cardita tegulata. Card, testd subflabelliformi, radiatim costatd, 



costis decern vel undecim, prominentibus, subtiliter squamulosis. 

 Conch. Icon., Cardita, pi. 9. f. 48. 



Hab. Valparaiso, South America (dredged from the depth of 

 twenty-five fathoms) ; Cuming. 



The sculpture of this shell reminds one of a tiled roof. 

 Cardita Cardioides. Card, testd globosd, Cardiiformi, radiatim 

 costatd, costis rotundatis, irregulariter nodulosis, interstitiis sub- 

 prof unde incisis ; albidd vel aurantid, strigis aurantiis latis, 

 transversis, vivide ornatd. 

 Conch. Icon., Cardita, pi. 9. f. 49. 



