AMPHIDESMA. 



Plate VI. 



Species 35. (Mus. Cuming.) 



Amphidesm.\ modesta. Amph. testa stthtrigmo-orhku- 

 lari, compresso-contexd, reqailaterali, concentrice dense 

 plicatd, plicis crassiusculis, irrei/iilaribus, Mc ilUcJIex- 

 uosis, interstitiis radialim miuutissinw elevato-siriatis ; 

 albidd, lirieis interruptis roseis otiscure radiatd. 



The modest Amphidesma. Shell somewhat triangu- 

 larly orbicular, compressly convex, equilateral, con- 

 centrically densely plicated, plaits rather thick, irre- 

 gular, here and there flexuous, interstices radiately 

 very minutely elevately striated ; whitish, obscurely 

 rayed with interrupted rose lines. 



Semele modesta, A. Adams, Pro. Zool. Soc. July, 1S53. 



Hab. Cape Palmas, West Africa ; Eedfield. 



A bluntly plaited species of a peculiar AstarteAike^ form. 



Species 36. (Mus. Cuming.) 



■ Amphidesma icteriea. This species is figured in the 

 genus Lucina at PI. X. fig. 60, with a remark that it par- 

 takes materially of the characters of Amphidesma. : 



Species 37. (Mus. Cuming.) ^. 



Amphidesma purphrascens. Amph. testa ovati , latere 

 antico rotimdato, postico anyidato, leviter Jlexuoso ; 

 concentrice dense acute liratd ; fidvescente, timbonibus 

 purpurascentibns, albiradiatis, intus pnrpiirascente. 



The purple Amphidesma. Shell oval, anterior side 

 rounded, posterior angled, slightly flexuous ; concen- 

 trically densely sharply ridged ; light fulvous, umboes 

 purple, white-rayed, purple in the interior. 



Sowekby, Pro. Zool. Soc. 1832, p. 199. 



Hab. St. Elena, West Columbia; Cumiug. 



The odd valve of this elegant species, here figured, was 

 picked up by Mr. Cuming on the sands at the above- 

 named locality. 



Species 38. (Mus. Cuming.) 



Amphidesma vestalis. Amph. testd orbiculari, latere 

 postico contorto-flexuoso ; albd,undiqiie concentrice dense 

 subtiliter striato-lamellatd, lamellis ad marginem ere- 

 mdatis, interstitiis nitide radiatim cancellatis. 



The vestal Amphidesma. Shell orbicular, posterior 

 side twistedly reflected ; white, concentrically densely 

 finely striately lamellated, lamella? crenulated along 

 the edge, interstices neatly radiately cancellated. 



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



ffab. China Seas. 



The lamellated and cancellated sculpture of this species 

 is the same as that which is so characteristic of the genus, 

 on an luiusually smaU pattern. 



Species 39. (Mus. Cuming.) 



Amphidesma lekticularis. Amph. testd orbiculari, 

 tenui, subventricosd, latere postico leviter jiexnoso ; albd, 

 striis fiUformibus snbjlexuosis concentrice sculptd, striis 

 impressis minutissimis radiantibus decussatd. 



The lens-shaped Amphidesma. Shell orbicular, thin, 

 subventricose, posterior side slightly flexuous ; wliite, 

 sculptured concentrically with thread-like subflexuous 

 striae, decussated with very minute impressed striae. 



Sovn-erby, Pro. Zool. Soc. 1832, p. 200. 



Sab. St. Elena, West Columbia (in sandy mud at six 

 fathoms) ; Cuming. 



A thin subventricose shell, with the scidpture rather 

 faintly developed. 



Species 40. (Mus. Cuming.) 



Amphidesma sponsa. Amph. testd orbiculari, ventrico- 

 siusculd, solidd, aquilaterali, latere antico rotimdato, 

 postico subangulato, Jlexuoso ; albd, concentrice dense 

 lamellatd, lamellis tenuibus, acutis, margine subtilissime 

 crenulalis, ad latera prodnctis, interstitiis hie illic con- 

 centrice tenuiliratis. 



The bride Amphidesma. SheU orbicular, rather ven- 

 tricose, solid, equilateral, anterior side rounded, 

 posterior subangled, flexuous ; white, concentrically 

 densely lamellated, lamellae thin, sharp, very finely 

 crenulated along the edge, produced at the sides, in- 

 terstices here and there concentrically finely ridged. 



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



ffab. Island of Zebu, Philippines ; Cuming. 



A fine solid ventricose shell of a pure white, elegantly 

 meUated throughout. 



November, 1853. 



