AMPHIDESMA. 



Plate II. 



Species 7. (Mus. Cuming.) 



Amphidesma Jukesii. Amph. testa orhiculari, compres- 

 siusculd, albidd, concentrice lamellosd, lamelUs subin- 

 crmsatis, eleganter minute crenulato-Jimbriatis, ad latera 

 productis, intersfidis temdssime coirugato-liratis, la- 

 tere antico rotundato, postico amjulato, ad marginem 

 veritralem Jlexuoso ; area excavatd utrhiqne cardinem 

 oblongd, nubpivfundd ; intus luted. 



JuKEs's Amphidesma. Shell orbicular, rather compressed, 

 whitish, coucentricnlly lamellose, laraellte rather thick- 

 ened, elegantly minutely creiiulately fimbriated, pro- 

 duced at the sides, interstices very finely wrinkle- 

 edged, anterior side rounded, posterior angled, flexu- 

 ous at the ventral mai-gin ; excavated area on each 

 side of the hinge oblong and rather deep ; yellowish 

 within. 



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



Hab. Torres Straits, Australia; Jukes. 



Most exquisitely wrinkled-ridged and crenulated beneath 

 the lens. 



Species 8. (Mus. Cuming.) 



Amphidesma ceenulata. Amph. testa suborbiculari, 

 convexd, subrude incrassatd, subtequilaterali, latere pos- 

 tico Jlexuoso ; sordide alba, nndique concentrice densii 

 minute Jimhrialo-lamellatd, interstitiis liris radianlibus 

 exilissime cancellatis. 



The crenulated Amphidesma. Shell somewhat or- 

 bicular, convex, somewhat inidely thickened, nearly 

 equilateral, posterior side flexuous ; dull white, con- 

 centrically densely minutely fimbriately lamellated 

 throughout, interstices very finely cancellated with 

 radiating ridges. 



SowERBY, Species Conch, (inedit.) Amphidesma, f. 13. 



Hab. Indian Ocean. 



A rudely thickened convex shell, very beautifully mi- 

 nutely frilled and cancellated throughout, like honey-comb. 



Species 9. (Mus. Cuming.) 



Amphidesma rupium. Amph. testd subovali vel subor- 

 biculari, subirreg atari, radiatim striata, liris interrup- 

 tis concentrice rugosd ; umbone Icemgato ; intus albd; 

 dentibus lateralibus subapproximatis, brevibus, crassis, 

 margineque doisali posticd purpureis. 



The eock Amphidesma. Shell suboval or suborbicu- 

 lar, rather irregular, radiately striated, concentrically 

 wrinkled with interrupted ridges ; umbo smooth ; 

 white within ; lateral teeth rather approximated, 

 short, thick, and, with the posterior dorsal margin, 

 purple. 



SowERBY, Pro. Zool. Soc. 1833, part 3. p. 199. 



Hab. Lord Hood's and Galapagos Islands, Pacific Ocean 

 (in the crevices of rocks and coral reefs) ; Cuming. 



A Petricola-\i\.e: species, of irregular growth, varying, 

 doubtless, more or less, according to the nature of its 

 habitat. 



Species 10. (Mus. Cuming.) 



AMPHIDES^[A SOLIDA. Amph. testd ovato-orbiculari, 

 crassd, spadiceo-albd, intus versus cardinem purpuras- 

 cente, liris undatis rugaformibus undique concentrice 

 sculptd. 



The solid Amphidesma. Shell ovately orbicular, 

 thick, fawn-white, purple in the interior towards 

 the hinge, concentrically sculptured throughout with 

 waved wrinkle-like ridges. 



Gray, Spicilegium Zoologicum, part 1. p. 6. pi. 6. f. 6. 



Hab. Valparaiso ; Cuming. 



A fine species of solid growth, sculptured externally with 

 concentric wavy wrinkle-like ridges. 



Species 11. (Mus. Cuming.) 



Amphidesma subtruncata. Amph. testa subquadrato- 

 orbionlari, tenuiculd, suhmquilaterali, latere postico 

 truncato, jlexuoso ; lutescente-albd, nitente, lineis roseis 

 subinterruptis promiscite radiatd, plicis tenuibus obtusis 

 flexuosis concentrice sculptd. 



The sub-truncated Amphidesma. Shell somewhat 

 squarely orbicular, rather thin, nearly equilateral, pos- 

 terior side truncated, flexuous ; yellowish-white, shin- 

 ing, promiscuously rayed with rose lines, and scidp- 

 tured concentrically with thin obtuse flexuous folds. 



SoWERBY, Species Couch, (inedit.) Amphidesma, f. 19 

 and 30. 



Hab. Island of Nevis, West Indies (in sandy mud at the 

 depth of six fathoms) ; Captain Powers. 



A dehcately rose-rayed Tellina-li\e species. 



October, 1853. 



