AMPHIDESMA.— Plate IV. 



tint ; concentrically lamella-ribbed, ribs nearly equal, 

 produced at the sides, interstices very minutely stria- 

 rayed, with a concentric raised line. 



Hanley, Recent Shells, Supp. pi. 13. f. 7. 

 Semele gratiosa, A. Adams. 



Hab. Moluccas. 



Of an obliquely oblong-oval form, densely ribbed with 

 recurved lamella;. 



Species 26. (Mus. Cuming.) 



Amphidesma punctata. Ampli. testa ovali, crassius- 

 cuM, albicante, sparsim rosea fidvoqtie mamdatd ; pos- 

 ticK subtruncald, plica, Jlexuosd posticali distincta; disco 

 externa concentrice impresso-punctato, marffinibus, in- 

 feriori costis nomiullis concentricis latis, dorsalibus 

 utritique roseo maculatis. 



The dotted Amphidesma. Shell oval, rather thick, 

 whitish, sparingly dotted with rose and fulvous ; pos- 

 teriorly somewhat truncated, with a distinct posterior 

 flesuous fold ; outer disk concentrically impressly 

 dotted, dorsal margins, the lower of wliich has some 



broad concentric ridges, spotted at both ends with 



rose. 

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

 Hab. GaUapagos Islands. 



A very characteristic, rudely sculptured species, of ob- 

 long-oval compressed form, sparingly dotted with rose. 



Species 27- (Mus. Cuming.) 



Amphidesma Formosa. Amph. testa ovali, albicante, 

 roseo radiatd et purpureo maculatd, concentrice costatd, 

 costis confertii, antice posticeque rugulosis ; umbonibus 

 intus Intescentibus. 



The beautiful Amphidesma. Shell oval, whitish, 

 rayed with rose, and blotched with purple, concen- 

 trically ribbed, ribs close-set, anteriorly aud poste- 

 riorly rugidose ; umboes yellowish interiorly. 



Sowerby, Pro. Zool. Soc. 1833, p. 199. 



Hab. St. Elena, West Columbia (dredged in seven fathoms 

 water) ; Cuming. 



A fine, large, richly coloured species, of TeWiwa-like as- 

 pect. 



: 



