CARD IT A. 



Plate III. 



Species 7. (Fig. If, Mus. Cuming.) 

 dita crassicostata. Variety y. (for description 

 vide Car dita, PI. II.) 



Species 9. (Fig. a and 6, Mus. Cuming.) 

 dita gubernaculum. Card, testd ovato-oblongd, de- 

 pressd, antice brevissimd, angustd, postice latissime 

 rotundatd, subalatd ; brunned, luteo purpureoque urn- 

 bones versus tinctd; costis plus minusve squamosis, 

 superioribus perpaucis, majoribus, inferioribus an- 

 giitis numerosis ; intus brunned, antice albicante. 

 \ rudder Cardita. Shell ovately oblong, depressed, 

 very short anteriorly, widely rounded and rather 

 wing-shaped posteriorly ; brown , stained with purple 

 or yellow towards the umbones ; ribs more or less 

 scaly, upper ribs very few and large, lower ribs nu- 

 merous and narrow; interior brown, white ante- 

 riorly. 



Variety (i. (Fig. 9 b.) 



ta alba, f usee- vix tincta. 

 >ll white, scarcely stained with brown. 

 kve, Pro. Zool. Soc, 1843. 

 b. Zanzibar. 



rhis is the nearest allied species to the C. semi-orbicu- 

 I the dark variety might indeed be easily mistaken 

 it, were it not for the scales and peculiar elongation 

 the ventral portion of the shell. 



Species 10. (Mus. Brit.) 



,r DI ta semi-orbiculata. Card, testa oblongo-ovatd, 

 antic* brevissimd, postice latiore compressd, lins em- 

 libus noduliferis ab umbonibus undatim divergentibus, 

 totaliter tectd ; rubido-et nigerrimo-fuscd, antice albd. 



JE semi-orbicular Cardita. Shell oblong-ovate, 

 very short anteriorly, wide and compressed poste- 

 teriorly, entirely covered with very fine nodulous 

 ridges, diverging in rather a waved manner from 

 the umbones; reddish and blackish brown, white 



anteriorly. 

 ruguiere, Enc. Meth. vers, vol. i. part 2. p. 410. 



Chama semi-orbiculata, Linnaeus. 



Chama phrenitica, Born, Chemnitz. 



Cardita plirenitica, Lamarck. 

 lab. Islands of Mindoro and Ticao, Philippines (under 



stones at low water) ; Cuming. 



Neither Born, Chemnitz nor Lamarck appears to have 

 been satisfied that this well-known shell, which they de- 

 scribed under the title of C. phrenitica, is the Chama or- 

 biculata of Linnaeus. Bruguiere, however, was of a dif- 

 ferent opinion; *' il est tres-vraisemblable," says that 

 author, " que e'est ici la coquille que Linne a decnt, 

 sous le nom de Chama orbiculata, et qui n'a point 6t< 

 reconnuepour telle par les auteurs, quoique sa description 

 aie €te faite avec assez d' exactitude, sans doute, parce- 

 que ce naturaliste n'avoit point cite de figures." And 

 Deshayes, in his new edition of Lamarck's ' Animaux 

 sans vertebres,' vol. vi.p.430, note, says, "La description 

 que Linne donne, dans le Museum de la Princesse Ul- 

 rique, de la Chama semi-orbiculata est telle que l'on ne 

 peut douter quelle soit exactement la meme que celle- 

 ci ; il conviendra done de lui restituer son nom Lin- 

 neen." 



Species 11. (Fig. a and b, Mus. Cuming.) 

 Cardita incrassata. Card, testa oblongd, elliptico- 

 ovatd, antice brevi. turgidd, albicante, fusco umbones 

 versus obscure maculatd, epidermide luteo -fitscescente 

 tenuiindutd; costis quindecim sedecimve.incrassatis, 

 rotundatis, latescentibus.arcuatim radiantibus; antic* 

 plus minusve crenatis, interdum subnodulosis ; intus 

 albd. 



The thickened Cardita. Shell oblong, elliptically 

 ovate, short anteriorly, swollen, whitish, obscurely 

 spotted towards the umbones with pale brown, and 

 covered with a thin yellowish-brown epidermis; 

 ribs fifteen or sixteen in number, thickened, round- 

 ed, increasing gradually in width, and radiating in 

 a curved direction ; anterior ribs more or less cre- 

 nated, sometimes slightly nodulous ; interior white. 



Sowerby, App. Tank. Cat., p. v. 



Chama incrassata, Wood (Ind. Test. Supp.). 



Variety /3. 

 Testa pallide cornea aut fulva ; costis purpureo-roseis, ru- 



bido maculatis et variegatis. 

 Shell pale flesh-colour or yellowish; ribs rose-tinted, 

 spotted and variegated with ruddy blotches. 

 Cardita rubieunda, Menke (Moll. Nov. Holl.). 

 Hab. New Holland. 



I have the best authority for stating that the shell 



July 1843. 



