AMPHIDESMA.— Plate VI. 



Species 41. (Mus. Cuming.) 



Amphidesma australis. Amph. testa orbiculari, con- 

 vexd, latere postico flexuoso ; alba, plus minus rosea 

 promisciie maculain et radlatd, concentrice crassipU- 

 catd, plicis suhfexuosis et Uneari-sulcatk. 



The southern Amphidesma. Shell orbicular, convex, 

 posterior side flexuous ; white, more or less promis- 

 ctiously spotted and rayed with rose, concentri- 

 cally thickly plicated, plaits subflesuous and linearly 

 grooved. 



Soweeby, Pro. Zool. Soc. 1832, p. 200. 



Hab. New Holland ; Sowerby. Lord Hood's Island, Paci- 

 fic Ocean (in the crevices of coral rocks) ; Cuming. 



Partaking of the character of A. G-rmieri, but of a more 

 rounded and convex form. 



Species 42. (Mus. Cuming.) 



Amphidesma ltjteola. Amph. testa orbiculari, ventri- 

 cosd, subaquilaterali, latere postico leviter fiexuoso ; 

 lutescente-albd, circa umbones Icevi, deinde Urii suhtili- 

 bus concentrice sculptd, interstitiis radiatim elevato-li- 

 iieatis ; intiis luted. 



The yellowish Amphidesma. Shell orbicular, ventri- 

 cose, nearly equilateral, posterior side slightly flexu- 

 ous ; yellowish-white, smooth around the umboes. 



then concentrically sculptured with very fine ridges, 

 interstices radiately elevately lineated ; interior yellow. 



Semele luteola, A. Adams, Pro. Zool. Soc. 18.53. 



Hab. ? 



A rounded faintly sculptured species of a yellowish hue. 



Species 43. (Mus. Cuming.) 



Amphidesma Martinii. Amph. testa subtrigono-ovatd, 

 crassd, convexiusculd, latere antico longiore, postico 

 subtruncato et valde fiexuoso ; albidd, cameo radiatd, 

 concentrice plicatd, plicis crassis, irregularibus, sape 

 dichotomis aut confluentibus, postice validi.oribus et 

 fiexuosis ; inlus lutescente. 



JIartin's Amphidesma. Shell somewhat triangularly 

 ovate, thick, rather convex, anterior side the longer, 

 posterior somewhat truncated and very flexuous ; 

 whitish, rayed with flesh, concentrically plaited, plaits 

 thicks, irregular, often dichotomous or confluent, pos- 

 teriorly stronger and flexuous; yellowish within. 



Semele Martinii, A. Adams, Pro. Zool. Soc. July, 1853. 



Hab. Rio. 



An interesting species, distinguished by its dichotomous 

 and solid growth, dredged in deep water ofi' Rio by M. 

 Adolphe Martin, a French captain, and diligent collector 

 of shells. 



