2i22 



bone laevigato; intus alba; clentibus lateralibus subapproxi- 

 matis, brevibus, crassis, margineque dorsali postica pm;- 

 pureis. 



Long. 1-25 polL, lat. 065 poll, alt. 1 poll.; Iong.l-3poll., 

 lat. O-TpoIL, alt. 1'2 polL 



Color variat albus. 



Legit H. Cuming in Oceano Pacifico (at Lord Hood's 

 Island; at the Gallapagos Lslands). 



Proceedings. 1832. p. 199. 



4 Amphidesma formosum G. B. Soii^erbt/. 



Amph. tesla ovali albicante, roseo-radiata et purpurco- 

 maculata, concenlrice costata, costis confertis, antice posti- 

 ceque rugulosis; umbonibus intus lutescentibus. 

 - Long. 2 poIL, lat. 0-7 poIL, alt. 1-6 poll. 



En pulcherrimum amphidesmatum! 



Legit H. Cuming ad St. Elenam. 



Proceedings. 1832. p. 199. 



5. Amphiclesma paHidum G. B. Soii-erhy. 



Amph. testa ovali, pallide purpurascenti-lulva, umbo- 

 nibus saturatioribus, tenuissime concentrice striata, epider- 

 mide teuui, subiridescente induta; latere postico subtrun- 

 cato, dorsali rotundato. 



Long. 1-25 poIL, lat. 0-45 polL, alt. 09 poIL 



Juniores testae pallidiores et magis fulvae. 



Legit H. Cuming ad Salango Columbiae occidentalis. 



Procecdings. 1832. p. 199. 



6. A m p h i d e s m a 1 a e V e G. B. Sowerhy. 



Amph. testa ovata, alba, laevigata, epidermide cornea, 

 tenui induta; latere postico breviore, rotundato, antico lon- 

 giore subacuminato ; sulco obsoleto posticali, ab umbone 

 ad marginem ventralem decurrente. 



Long. 1-45 poIL, lat. 0*35 poIL, alt. 1-1 polL 



Legit JL Cuming ad Xipixapi Columbiae occidentalis. 



Proceedings. 1832. p. 199. 



