A M P H I D E S M A . 



Plate III. 



Species 14. (Mus. Cuming.) 



Amphidesma DUPLiCATA. Amph. testd ovali-orbicidari, 

 eompressd, subaguilaterali, postice Jlexuosd ; lutescente- 

 alM, lideo roseoque promiscue punctata et paUidi ra- 

 diatd, concenlrice subirref/nlariter dense dupUcato-U- 

 raid, liris interditiisque siriis radianiibus minute sca- 

 brosis crenulatis. 



The double-kidged Amphidesma. Shell oval-orbicu- 

 lar, compressed, nearly equilateral, posteriorly flexu- 

 ous; yellowish-white, promiscuously dotted and faintly 

 rayed with yellow and rose, concentrically somewhat 

 irregularly densely double-ridged, ridges and inter- 

 stices crenulated with minute scabrous radiating striae. 



SowEEBY, Species Conch, (inedit.) Amphidesma, f. 14 

 and 15. 



Hub. Antigua. 



An exquisitely sculptured species in which the concen- 

 tric ridges are arranged in pairs, delicately and beautifully 

 painted. 



Species 15. (Mus. Cuming.) 



Amphidesma decora. Amph. testd orbiculari, subaqtd- 

 laterali, compressiusctdd, liris concentricis et radianti- 

 bus undique eximie reticulata, latere antico sublongiore, 

 rotundato, postico subtnmcato, valde flexuoso ; intus 

 albd. 



The graceful Amphidesma. Shell orbicular, nearly 

 equilateral, rather compressed, delicately reticulated 

 throughout with concentric and radiating ridges, ante- 

 rior side rather the longer, rounder, posterior slightly 

 truncated, very Hexuous ; white within. 



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



Hab. ? 



Closely reticulated over by small delicate concentric and 

 radiating ridees. 



Species 16. (Mus. Cuming.) 



Amphidesma lamellosa. Amph. testd subquadrato- 

 ovatd, subplano-compressd, laieribus subarigulatis, pos- 

 tico flexiwso ; marmoreo-albd, concentrice lamellato-U- 

 ratd, liris elevatis, recurvis, exienie crispato-cremdatis, 

 ad latera pjroductis et conferlis. 



The lamellose Amphidesma. Shell somewhat squarely 

 ovate, rather flatly compressed, sides somewhat angled. 



posterior flexuous ; marble-white, concentrically la- 

 meUarly ridged, ridges raised, recurved, outwardly 

 crisply crenulated, produced and crowded at the 

 sides. 



SowERBY, Species Conch. Part 2 (inedit.) Amphidesma 

 f. 9 and 19. 



Hub. Australia. Java. 



The lamellar ridges which characterize this species are 

 curled over towards the umboes, showing the outer surface 

 to be crisply crenulated. 



Species 17. (Mus. Cuming.) 



Amphidesma rosea. Amph. testd suborbiculari, rosed, 

 concentrice costatd, epidermide fused lucidd indutd ; 

 latere postico sidiemarr/inato ; coslis confertis, acutis. 



The rose Amphidesma. Shell nearly orbicular, rose, 

 concentrically ribbed, covered with a brown lucid 

 epidermis ; posterior slightly emarginated ; ribs close- 

 set, sharp. 



SowEEBY, Pro. Zool. Soc. 1832, part 2. p. 199. 



Hab. Tumbez, Peru ; Cuming. 



A fine characteristic species, described originally by Mr. 

 Sowerby from a single valve, obtained by Mr. Cuming in 

 the above-named locality. 



Species 18. (Mus. Cuming.) 



Amphidesma casta. Amph. testd oblongo-ovali, compres- 

 siusculd, inaquilaterali, latere antico lonyiore, rotun- 

 dato, postico subangulato-rotundato, flexuoso ; albd, um- 

 bonibus inlerdum flavescentibus ; radiatim striata, con- 

 centrice dense lamellosd, lamellis tenuibus, pulcherrime 

 Jimbriatis, ad latera prominentioribus. 



The chaste Amphidesma. Shell oblong-oval, rather 

 compressed, inequilateral, anterior side the longer, 

 rounded, posterior rather angularly rounded, flexuous ; 

 white, umboes sometimes yellowish ; radiately striated, 

 concentrically densely lamellated, lamellje thin, very 

 beautifidly frilled, more prominent at the sides. 



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



Hab. Moreton Bay, Australia ; Strange. 



Most elegantly and beautifully sculptured, the whole of 

 the fine lamella? being delicately frilled at the edge. 



October, 1853. 



