110 



taken specimens of this species in sandy mud, at the depth of seven- 

 teen fathoms. 



Cardium parvum. Conch. Illustr. f. 33. Card, testa ovali, subqua- 

 dratd, postice subangulatd, antice rotundatd, pallide Julvd, fusco 

 rubescente angulatini maculatd ; costis numerosis, subplanulalis ; 

 sulcis angustis. 



Long. 0-50 ; lat. 0-40 ; alt. 0-43 poll. 



Hai. ? 



Cardium fornicatum. Conch. Illustr. f. 50. Card, testa subqua' 

 dratd, postice angulatd, antice rotundatd ; albd, purpureo-macu- 

 latd, intus aurantiacd, ad margines jmrpureo-rufcscente macu- 

 latd : costis 35, quaruni anteriorum 23 biangulatis, imbricalis, ad 

 latera minutissime spinoso-crenulatis. 

 Long. 1- ; lat. 0-75; alt. T poll. 



Hah. ? Mus. F. J. Stainforth. 



A very beautiful shell, in some respects resembling C. medium, 

 but not so angular, and having the ribs richly ornamented by vaulted 

 imbrications in the centre, and very minute crenulations raised into 

 points at the sides. Unfortunately, we possess no information re- 

 specting the locality. 



Cardium imbricatum, Conch. Illustr. f. 48. Card, testa crassd, 

 ventricosd, antice rotundatd, postice subquadratd, angulatd; 

 albd, intus aurantiacd, purpureo maculatd : costis 28, quorum 19 

 anterioribus valde imbricatis, postremis sublcevibus, subangulatis ; 

 imbricatis prope umbones, angulatis, fornicatis, prope marginem 

 ventralem obtusis. 



Long. 1-20; lat. 1-05; alt. 1-30 poll. 



Hab. ad oras Australiae (S\?an River). 



Like C. medium in general form, but having vaulted imbrications 

 on the ribs. These are much thicker and larger than in C. fornica- 

 tum, and the sides of the ribs are not crenulated as in that species. 



Cardium subretusum. Conch. Illustr. f. 24. Card, testd albd, ob- 

 lique subquadratd, ventticosd, postice subcarinatd, acuminata, 

 antice subrotundatd ; post angulum complanatd, leviter sulcatd ; 

 costis ante angulum sex, tuberculatis ; interstiliis punctatis ; 

 ante umbones cavernuld cordiformi, intiis leviter callosd. 

 Long. 0-90; lat. 1-20; alt. 1 30 poll. 

 Hab. 



Thus we have three species presenting the character in common, 

 of having a callosity within a heart-shaped cavity, close under the 

 umbones, namely, the true C. retusum ; the var. " (2.) testa punctis 

 sanguineis picta" of Lam., which has been named C. auricula by 

 Forskall, and the present species, which resembles the original C. re- 

 tusum in general appearance, but it is more elongated and smoother 

 behind the angle, the cavity is not so deep, and the callosity is more 

 strongly marked. 



