Zoological Society. 307 



cut interstices between the ribs, which are unusually flat towards 

 the margin. 



Cardita semen. Card, testd ovatd, suhcomj}ressdy tenui, radiatim 



costatd, costis plano-convexis ; olivaceo-fuscd, 

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



Hah. Mexillones, Desert of Atacavna, Bolivia (found at tlie 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 vet trihus et vigi7iti, compressis, regulariter nodu- 

 losis; lutesccnte-albd, prope margineru aurantio tinctd. 

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

 Hah. 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, siibcompressd, 

 latere postico elongato-recto ; radiatim costatd, costis 2)aululum 

 curvatis, sqiunnosis ; fuscescente. 

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



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

 depth of twenty-five fathoms); Cuming. 



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

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

 hus, platiiusculis, interstitiis angustis. 

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



Hah. 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. horealis in miniature. 



Cardita flabellum. Card, testd Jlabelliformi, radiatim costatd, 



costis leviter serratis ; olivaceo-fuscd. 

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

 Hah. 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 suhjlahelliformi, radiatim costatd, 



costis decern vet undecim, jy^'ominentihus, subtiliter squamulosis. 

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



Hah. 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 glohosd, Cardiiformi, radiatim 

 costatd, costis rotundatis, irregulariter nodulosis, interstitiis siih- 

 profunde incisis ; alhidd vel aurantid, strigis aurantiis latis, 

 transversis, vivide ornatd. 

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



