AlIPHIDESMA.— Plate II. 



Species 12. (Mus. Cuming.) 



Amphidesma kadiata. Amph. testa subquadrato-orbicu- 

 lari, postice oblique fexuosd, crasad, striis subtiUbus 

 dense radiatd, plicis tetmibus planulatis irregularibus 

 cottcentrice sculptd ; lutescente-albd, aurantio-carneo 

 pallid^ tinctd et radiatd. 

 The hayed Amphidesma. Shell aubquadi-ately orbicu- 

 lar, posteriorly obliquely flesuous, thick, densely rayed 

 with fine striee, concentrically sculptured with thin 

 flattened folds; yellowish-white, faintly tinged and 

 rayed with orange-flesh. 

 RUPPELL, MSS. in Mus. Frankfort. 

 Hab. Eed Sea (in coral sand) ; Euppell. 



A thick obliquely flexuous orbicular shell, tinged and 

 rayed with orange-flesh, the surface being rayed with mi- 

 nute striae across thin flattened folds, which are covered in 

 part with a peculiar deciduous epidermis. 



Species 13. (Mus. Cuming.) 



Amphidesma orbiculata. Amph. testa orbiculari, pos- 

 tice Jlexuosd, latere antico paululum breviore, nmboni- 

 bits subpromintdis ; sordide albd, prope marginem fusco 

 tinctd, radiativi dense Jiexitoso-striatd, concentrice lineis 

 tenuibus elevatis fexuosis subinterruptis sculptd. 



The orbicular Amphidesma. Shell orbicular, poste- 

 riorly flexuous, anterior side a little the shorter, um- 

 boes rather prominent ; dull white, tinged with brown 

 near the margin, radiately densely flexuously striated, 

 concentrically sculptured with rather interrupted thin 

 flexuous raised Mnes. 



Say, Journ. Acad. Nat. Sci. Phil. vol. 2. p. 307. 



Hab. United States. 



A rounded F««<s-like species of denser cancellated sculp- 

 ture than the preceding. 



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