108 



Cardium subelongatum, Conch. Illustr. f. 61. Card, testd ovali, 

 subventricosd, elongald, erased, post'ice pauld liianle ; albd,fusco 

 rubioffie maculatd, epidcrmidejtavicante indutd ; costis 32, qua- 

 rum anticis hiangulaUs, crcnulatis ; mediis Icevibiis, biangulatis ; 

 posticis rotundotis, Icevihus, tuberculin ohliquis ornatis. 



Long. 1-85; lat. 1-40; alt. 2-35 poll. 



Hab. ad Sanctse Thomse insulam (Ind. occidentalis) . 



The above name has been given, to indicate the near alliance be- 

 tween this species and the true C. elongatum of Brug., with which 

 it has been confounded. Our shell resembles some of the figures to 

 which Lamarck refers for his C. marmoreum, and which Bruguifere 

 quotes for C. elongatum. It is much longer and smoother than the 

 former, and does not agree with the description. The true C elongatum 

 is described by Brug., from a specimen in the collection of M. de La- 

 marck, as an elongated, ventricose shell of 39 or 40 ribs, and attain- 

 ing a large size. It seems to have been a matter of dispute between 

 the two conchologists, whether the above-named species were iden- 

 tical. We were unable to meet with a shell agreeing with Bru- 

 guiere's description, until the arrival of Mr. Cuming with fine spe- 

 cimens sufficiently characteristic to set the matter at rest. The 

 present species has fewer ribs and is less ventricose. 



Cardium enode. Conch. lUustr. f. 51. Card, testd ovali, ventri- 

 cosd, postice subc.xpansd, forlisshne dentatd ; pallidefulvd rosea 

 fasciatd, intiis albd, sub umbonibus Jlavidd, ad marginem purpu- 

 rea; costis 38, planulatis, anlicis leviter crenalis; iiiterstitiis 

 angustissimis. 

 Long. 2-30; lat. 1-60; alt. 2-60 poll. 

 Hab. ad insulam Ceylon. 



Much more spread than C. elongatum, with the ribs flatter, and 

 terminating in very strong overwrapping teeth. 



Cardium stjbrugosum. Conch. Illustr. f. 34. 71. Card, testd 

 crassd ovali ventricosd, cetale postice subacuminatd ; costis Z^, 

 quarum 25 anterioribus rotundatis, crenulalis ; extremis Icevibus 

 vix elcvatis ; epidermide fused, 



Var. testd albd, purpureo maculatd. 



Var. testd postice albd, antice flavidd. 



Long. 2-30; lat. 1-70; alt. 2-40 poll. 



Hab. ad insulam Ceylon. 



The ribs are not so deep as in C rugosum, and the eight posterior 

 ones are so little raised as to leave the surface nearly smooth. 



Cardium alternatum. Conch. Illustr. f. 64. Card, testd oblique 

 ovali, compressd, postice subexpansd, albd, luteo vclfusco-fia- 

 vescente fasciato-maculatd ; epidermide ftisco indutd; costis 32, 

 anticis crcnulatis, subangulatis ; deinde posteriuribus angulati& 

 antice Icevibus ; extremis muricalis ; interstitiis convexis, utrin-. 

 que sulcatis. 



Long. 2-40; lat. 130; alt. 2-60 poll. 



