CARDITA.— Plate I. 



Species 2. (Mus. Cuming.) 



Cardita radula. Card, testa subquadrato-oblongd, al- 

 bidd, depressd, costis tribus et viginti, rubido-fuscis, 

 imbricato-squamosis, squamis fornicatis , semi-erectis, 

 subacutis; costarum interstitiis crenulatis ; murgine 

 crenato. 



The rasp Cardita. Shell somewhat squarely oblong, 

 whitish, depressed, ribs three-and-twenty in num- 

 ber, covered with rather sharp, half- raised vaulted 

 scales ; interstices between the ribs crenulated ; 

 margin crenated. 



Reeve, Pro. Zool. Soc, 1S43. 



Hab. ? 



There are two or three more ribs in this shell than in 

 the following ; the dark spots are more numerous, of a 

 reddish instead of a bluish brown, and not of that pecu- 

 liar half-moon shape, and the scales are more vaulted 

 and erect. 



Species 3. (Mus. Cuming.) 



Cardita variegata. Card, testd oblongd, gibbd, albd, 

 maculis ceeruleo-fuscis lunatis pictd ; costis una et vi- 

 ginti, imbricato-squamosis, squamis fornicatis, incum- 

 bentibus ; costarum interstitiis crenulatis ; margine 

 valde crenato. 



The variegated Cardita. Shell oblong, gibbous, 

 white, painted with bluish-brown half-moon-shaped 

 spots ; ribs twenty-one in number, covered with 

 vaulted scales lying one upon the other, interstices 

 between the ribs crenulated ; margin strongly cre- 

 nated. 



Bruguiere, Enc. Meth. vers, p. 407. pi. 233, f. 6. 

 Chama calyculata ? Linnaeus. 

 Cardita calyculata, Lamarck. 



Hab. Indian and Chinese Seas. 



I quite enter into the opinion entertained by Bru- 

 guiere and Deshayes in regard to this shell not being 

 the true C. calyculata of Linnseus. 



Species 4. (Mus. Cuming.) 



Cardita pectunculus. Card, testd elongato-oblongd, 

 antice pallide luteold, postic'e olivaceo-fuscd ; costis 

 quindecim, anticis versus marginem obsoletis, posticis 

 latioribus, subangulatis ; intus albicante, postice pur- 

 pureo-fuscescente ; margine crenato, interstitiis fusco 

 tinctis. 



The small-comb Cardita. Shell elongately oblong, 

 yellowish anteriorly, olive-brown posteriorly ; ribs 

 fifteen in number, anterior ones nearly obsolete to- 

 wards the margin, posterior wider and rather angu- 

 lar ; interior whitish, except at the posterior end, 

 which is rich chocolate-brown ; margin crenated, 

 interstices stained with brown. 



Bruguiere, Enc. Meth. vers, p. 412. 

 Lister, Conch., pi. 347. f. 185. 



Chama pectunculus, Dillwyn. 

 Hab. Madagascar. 



This species, which is the largest and most character- 

 istic of the elongated portion of the Cardita, partakes in 

 great measure of the characters of the C. radiata and 

 affinis; it has, however, neither the spotted or banded 

 painting of the former, nor the small prickly scales of 

 the latter, and it differs constantly in size and other not 

 less significant characters. Lamarck seems to have 

 omitted mention of this species. 



Species 5. (Fig. a and b, Mus. Cuming.) 



Cardita radiata. Card, testd elongato-oblongd, pal- 

 lide fiavidd aut rosed, maculis aut fasciis fuscis va- 

 riegatd; costis septemdecim, anticis liris minutis 

 transversim decussatis, posticis rotundatis, costd dor- 

 sali squamiferd ; margine latissime crenato. 



The radiated Cardita. Shell elongately oblong, pale 

 yellowish or rose-colour, variegated with dark black 

 or brown spots, sometimes ranging obliquely in 

 bands; ribs seventeen in number, anterior ones 

 crossed with minute ridges, posterior rounded, the 

 dorsal rib next the ligamentary pit scaly. 



Broderip, Pro. Zool. Soc, 1832. 



Hab. Salango, West Columbia, and Panama (found in 

 muddy sand at the depth of from six to twelve fa- 

 thoms) ; Cuming. 



The specimens of this interesting species collected by 

 Mr. Cuming present a remarkable variation in the form 

 of the posterior extremity. In some (Fig. 5 a.) it is much 

 attenuated, in others (Fig. b.) it is comparatively broad, 

 whilst both varieties exhibit all other characters in corn- 



Species 6. (Mus. Cuming.) 



Cardita affinis. Card, testd subelongato-oblongd, oli- 

 vaceo-fuscd; costis septemdecim, anticis obsoletius- 

 culis, posticis rotundatis, ftexuosis, subangulatis, prope 

 umbones muricato-squamosis ; intus albicante, postice 

 purpurea -fusco tinctd. 



The allied Cardita. Shell rather elongately ob- 

 long, dark olive-brown ; ribs seventeen in number, 

 anterior ones rather obsolete, posterior rounded, 

 flexuous, somewhat angular, armed near the um- 

 bones with prickly scales ; interior whitish, stained 

 at the posterior end with dark purple or chocolate- 

 brown. 



This species may be easily distinguished by the small 

 prickly scales which appear on the posterior ribs ; they 

 appear to be deposited only during the early growth of 

 the shell. 



