CARDIUM. 



Species 54. (Mus. Cuming.) 

 Cardium Icelandicum. Card, testa subdepresso-ovatd, 

 tenuiculd, inaquilaterali, lateribus rotundatis, antico 

 brevissimo ; radiatim costatd, costis quaternis quinisve 

 1 1 triginta, parvis, angustis, medio mbtilissime st rratis; 

 albidd, epidermide crassd Jictili indutd; umbonibus plus 



miiin-sre ero-si.s. 



The Iceland Cockle. Shell somewhat depressly ovate, 

 rather thin, very inequilateral, sides rounded, the an- 

 terior very short ; radiately ribbed, ribs four or five 

 and thirty in number, small, narrow, finely serrated 

 down the middle; whitish, covered with a thick 

 earthy epidermis; umbones more or less eroded. 



Chemnitz, Conch. Cab. vol. vi. p. 300. pi. 19. f. 195-6. 

 Cardium Arcticiim, Sowerby. 

 Testa juvenis. — Cardium pubescens, Courthouy. 



Hub. Iceland. 

 The form of this shell is very much like that of a Cytlwrea. 



Species 55. (Mas. Cuming.) 

 Cardium subrugosum. Card, testa subehngato-ovatd, 

 umbones versus attenuatd, valde obliqud, latere antico 

 peculiariter rotundato ; radiatim costatd, costis ad tri- 

 cenis, pluribus minoribuwe, postremis Ixoibus, eateris 

 rugoso-crenatis; lutescente-albd, pallide rosacea, epider- 

 mide luteo-fuscd margines versus interdum indutd. 

 The slightly-wrinkled Cockle. Shell rather elon- 

 gately ovate, attenuated towards the umbones, very 

 oblique, anterior side peculiarly rounded ; radiately 

 ribbed, ribs about thirty, more or less, the extreme 

 posterior ribs smooth, the rest rugoselj crenated; 

 yellowish white faintly tinged with rose, sometimes 

 covered towards the mar-ins with a brown epidermis. 

 Sowerby, Pro. Zool. Soc, 1840 ; Conch. lUus. f. 34. 

 Hob. Ceylon, Philippine Islands, and Zanzibar. 



The extreme posterior ribs of this species are smooth 

 and nearly obsolete, whilst the middle ribs are most deli- 

 cately wrinkled ; and the wrinkles, increasing gradually in 

 size and distance from each other, impart to the anterior 

 portion of the shell, a distinctly crenated ch 



Species 56. (Mus. Cuming.) 



Cardium Panamense. Card, testa subelongato-ovatd, ven- 

 tricosd, umbones versus attenuatd, latere antico rotun- 

 dato, postico subangulato ; radiatim costatd, costis ad 

 vicenis, magnis, conspicuis, primum angulatis, demum 

 rut a mlii lis ; albidd, epidermide olivaced indutd ; mar- 

 ginibus posticis nit"* purpurascentibus. 



The Panama Cockle. Shell rather elongately ovate, ven- 

 trieose, attenuated towards the ami ds ai 



rounded, posterior rather angulated ; radiately ribbed, 

 ribs about twenty in number, large, conspicuous, first 

 angulated, then rounded ; whitish, covered with an 

 olive epidermis, posterior mar-ins purple within. 



Sowerby, Pro. Zool. Soc., 1st:!. 



lint). Panama (found in sandy mud at the depth of about 

 ten fathoms); Cuming. 

 This is a truly noble species, very closely allied t > tin 



Cardium procerum, but easily distinguished by its more 



elongated form, and by the marked development of the ribs. 



Specie- 57. (Mus. Cuming.) 

 Cardium suiselonoati m. Curd, trstd w''V'w ; /'" - 



oblongd, radiatim ro.sta/d, costis ad duabrn vel tribus 

 it triginta, urn/" angulatis, interstitiu profunda exca- 



Vatis, rustic jinxtrrmis ti'brrrn/ati.s, mediiniix t/r-ribns. 

 in// iris rrrn/i/is : albidd ant jlacirantr, rubra tii/rtd >■/ 



iiiiirnlnld. 



The slightly-elongated Cockle. Shell rather i lon- 

 gatelj ovate, oblique, radiately ribbed, ribs about two 

 or three and thirty in number, sharply angled, inter- 

 stices between them deeply excavated, the extreme 

 posterior ribs armed with small tubercles, the middle 

 ribs smooth, the anterior crenated; whitish or yel- 

 lowish, stained and spotted with red. 



Sowerby, Pro. Zool. Soc., L840. 



Hob. Island of St. Thomas, West Indies. 



The deep-ploughed interstices between the ribs are very 



characteristic in this 



Species 58. (Mus. Cuming.) 

 Cardium maculatum. Card, testa obhngo-ovaM, valde 

 obliqud, umbones versus attenuatd, latere antico peculi- 



aril i r mtinidatii; radiatim rustutd, /■as/is dm/bus trit/i/sr, 



rl triginta, plano-convexis, approximatis, 

 cherrime erenulato-rugosis ; rufi 

 vivide tinctdet maculatd, umboni 

 The spotted Cockle. Shell oblong-ovate, very 



attenuated towards the umbones, anterior side pecu- 

 liarly rounded, radiately ribbed, ribs two or three and 



thirty in number, flatly convex, approximated, the 



anterior ven beautifully erenulatcly wrinkled; reddish, 

 stained and spotted with bright red. umbones « bitish 

 Sowerby, Conch. Dlus. Cat. Card. Sp. 56. f. L8. 



I [id of Tres Marias, Gulf of Mexico. 



The ribs of this beautiful species mv flattened and pecu- 

 liarly approximated, the interstices exhibiting all the ap- 

 pearance of deep narrow cuts. The delicate crenulatcil 

 sculpture of the/ entsavery striking effect. 



