CARDIUM, 



Plate XIII. 



Species 47. (Mus. Cuming.) 

 CARDiint leucostoma. Card, testa depresso-ovatd, sub- 

 obliqud; radiatim costatd, costis ml tribus <■/ triginta, 

 plano-convexis, peculiariter separatis, lateraliter sub- 

 tilissime serratis, costis anticis crenatis ; lutescente aut 

 rosaceo-ficscescente, rosacea aurantioque marmoratd ; in- 

 tus alba, marginibus aurantiis, radiisque binis aurantiis 

 infra umbones interdum tinctd. 

 The white mouth Cockle. Shell depessrly ovate, some- 

 what oblique ; radiately ribbed, ribs thirty-three or four 

 in number.flatly convex, peculiarly separated from each 

 other, laterally very finely serrated, anterior ribs ere- 

 nated ; \ ellowish, or light pinkish brown, marbled \\ ith 

 pink and orange ; interior white, edges stained with 

 orange, sometimes two faint orange rays beneath the 

 umbones. 

 Born, Mus. Cass. Yind. pi. 3. f. 6 and 7. 



Cardimn marmoreum, Lamarck. 

 //,///. Singapore (found in sandy mud at lowwatt r); Cuming. 

 M. Deshayes very properly urges the propriety of re- 

 storing to this species the name under which it was origi- 

 nally published by Born, and adopted by Chemnitz. Lister 

 may have used the word " marmoreum " in describing it, hut 

 the titles applied by the great founder of the ishmolean 

 collection to Ins figures of shells, have become obsolete 

 through not being 111 accordance with the admirable form 

 of nomenclature, now in use, which was subsequently intro- 

 duced by Linnaeus. 



The ribs of the Cardinm leucoitmna are developed with 

 peculiar distinctness, owing I 

 decision of the grooves which separate then 

 very well portrayed by Mr. Wood m the 

 of a specimen which he has erroneously 

 ■General Conchology,' PL LIII. f. 3, for the 



gatum. In his a unt of that species he 



an oblong oval shell, with forty longitudinal 



to Bruguiere, bul our specimens have only thirty-four ;'• 



the specimens he had 



doubt Cardimn leucosto 



and 



gured in the 

 i 'arditim elon- 

 :iys, " This is 

 ■ihs according 



_■!• consideration were 



tarum interstitik cowoexu, utrinque imprmo-sidcatis ; 

 albidd mil earned, luteo maculatd, margines versus 

 rufescente-fusco interdum vivide tinctd ; marginibuz 

 intus uiolaceo-brunneis. 

 The alternated Cockle. Shell depressly ovate, rerj 

 oblique, posteriorly slightly angulated and a little 

 gaping; radiately ribbed, ribs two and thirty in num- 

 ber, angulated, the posterior especially ; anterior ribs 

 crenated, posterior prickly; interstices between the 

 ribs convex, peculiarly impressly grooved down each 

 side; whitish or flesh-colour, spotted with yellow, 

 sometimes richly stained with pinkish brown towards 

 the margins; margins violet-brown interiorly. 

 Sowerby, Pro. Zool. Soc., 1840. 



Hub. Island of Ticao, Philippines (found in coral sand on 

 the reefs) ; Cuming. 

 This line species may he distinguished by its very ob- 

 liquely curved growth, and bj the peculiar sculpture of the 

 interstices between the ribs, which present the appearance 



of having a minute alternate rile 



lievoiid 



es 6! 



Cardioi alternatum 

 obliqud, postice mxc 

 costatd, costis duabu 

 cipue; costis antici 



. (Mus. Cuming.) 



Card, testa depresso-ovatd, valde 

 <qulatd,paululum Mante ; radiatim 

 et triginta, angulatis, posticis pns- 

 crenatis, posticis murkatis; cos- 



Januarj 1845 



Species 66. (Mus. Cuming.) 

 Caedium Nuttallii. Card. testa cordato-ovatd, I 



formi, radiatim costatd, costis duahes et triginta, pos- 

 tremis creberrimis mbobsoletis, cateris rotundatis un- 

 dique arcuatim nodnloso-crenatis .■ albidd, epidermide 

 olivaceo-fusca crassii ■■■ uld indutd. 

 Nuttall's Cockle. Shell cordately ovate, Venus-shaped, 

 radiatelj ribbed, ribs two and thirty in number, the 



extreme posterior ribs very close and almost obsolete, 

 the rest rounded, nodulouslj crenated in an arched 



manner throughoui ; whitish, covered with a rathi r 



thick olive-brown epidermis. 

 Conrad, Journal Academy .Nat.Sci. Philadelphia, p. 229. 



pi. 17. f. 3. 



llab. Sitka, North West cast of \i ca 



Xhis is a uoble pecies though not exhibiting an; 

 tive display of colours ; the ribs are rounded, and regularly 

 crena t e d, in a peculiar arched style, from the mat 

 the summit of the umbones. AJ1 the specimens thai bavi 

 come undernrj notice are curiou l; i 

 distinct epochs of growth. The firsi stage of growth is 

 completed within about the radius of an inch from the um- 

 bones, and it is .succeeded b\ other 

 throughout. 



at rather less intervals 



