A M P H I D E S iM A . 



Plate V. 



Species 28. (Mas. Cuming.) 



Amphidesma Sinensis. Amph. testa, siibohlongo-orbicu- 

 lari, aquilaterali, compressiusculd, albidd, epidermide 

 sub/used partim indutd, liris niimerosis temulus uiidi- 

 qve dense cancellatd ; latere antico rotundato, postico 

 truncaio, subflexuoso ; umbonibm rosacets, ItEvibus. 



The Chinese Amphidesma. Shell rather oblong-orbi- 

 cular, equilateral, rather compressed, whitish, par- 

 tially covered with a light brownish epidermis, densely 

 cancellated throughout with numerous fine ridges ; 

 anterior side rounded, posterior truncated, rather flex- 

 nous ; umboes pink, smooth. 



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



Hab. China. 



The concentric ridges have a thread-like appearance, 

 while those which radiate fi'om the vicinity of the umboes 

 are obtuse and somewhat irregular. 



Species 29. (Mus. Cuming.) 



Amphidesma reticulata. Amph. tesld orbiculari,aqui- 

 laterali, compressiusculd, lutescente-albd, liris tenuibiis 

 Jiliformibus concentrice sculptd, interstiliis sub lente 

 minute radiatim striatis ; latere antico rotundato, pos- 

 tico truncato, subjiexuoso ; intus lutescente. 



The reticulated Amphidesma. Shell orbicular, equi- 

 lateral, rather compressed, yellowish-white, sculptured 

 with fine thread-like concentric ridges, the interstices 

 between which are, beneath the lens, finely radiately 

 striated ; anterior side rounded, posterior truncated 

 and slightly flexuous ; interior yellow. 



Sowerby, Species Conch, (inedit.) Amphidesma, f. 11 

 and 13. 



Hab. Brazils and West Indies (in sandy mud). 



Sculptured with concentric thread-like ridges, compara- 

 tively rather distant, with the interstices very minutely 

 radiately striated. 



Species 30. (Mus. Cuming.) 

 Amphidesma cordiformis. Amph. testa orbiculari, 

 crassiusculd, aquilaterali, compresso-convexd, albidd, 

 liris tenuibus undique dense minuti} decussatd, lateribus 

 subtrigotiis, postico truncato, leviter Jlexuoso ; uniboni- 

 bus rosaceis, lavibus, areis utrinque tmibones lineis 

 roseis subdistantibus ornatis. 



The heart-shaped Amphidesma. Shell orbicular, 

 rather thick, equilateral, compressly convex, whitish, 

 densely minutely decussated throughout with fine 

 ridges, sides somewhat triangular, posterior side 

 truncated, slightly flexuous ; umboes rose, smooth, 

 areas on each side the umboes ornamented with 

 rather distant rose lines. 



Sowerby, Species Conch, (inedit.) Amphidesma, f. 7. 



Hab. Indian Ocean ; Humphreys. 



An extremely rare species, closely allied to A. Sinensis, 

 but of a more orbicular form, rather thicker, and more 

 finely sculptured. 



Species 31. (Mus. Cuming.) 



Amphidesma elliptica. Amph. testd elliptico-ovatd, 

 alba, subobliqud, lavi, epidermide sordidd; latere an- 

 tico longiore, rotundato, postico oblique subtruncato, 

 superficie concentrice Urato-striatd, strlis subtitissimis 

 impressis radiatd. 



The elliptic Amphidesma. Shell elliptic-oval, white, 

 rather oblique, smooth, with a dirty epidermis ; ante- 

 rior side the longer, rounded, posterior obliquely sub- 

 truncated, surface concentrically ridge-striated, radi- 

 ately marked with very fine impressed striaB. 



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



Hab. Monte Christe, West Columbia (in sandy mud at 

 nine fathoms) ; Cuming. 



A fine species, of a peculiar elliptic-oval form, simply 

 stria-sculptured. 



Species 32. (Mus. Cuming.) 



Amphidesma amabilis. Amph. testd oblongo-ovatd, 

 compressd, albidd, concentrice lamellosd, lamellis eleva- 

 tis,plicatis, margine crenulatis, ad latera productis, in- 

 terstitiis striolatis, lira filiformi concentricd sculptis ; 

 latere antico vix longiore, postico Jlexuoso. 



The lovely Amphidesma. Shell oblong-ovate, com- 

 pressed, whitish, concentrically lamellose, lamellae 

 raised, plicated, crenulated along the edge, produced 

 at the sides, interstices finely striated, and sculptured 

 with a concentric filiform ridge ; anterior side rather 

 the longer, posterior flexuous. 



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



November, 1853. 



