AMPHIDESMA.— Plate VII. 



Species 49. (Mus. Cuming.) 



Amphidesma virginea. Amph. testa oblongo-ovatd, 

 temd, subpellucido-albd, plick filiformihus subdislanti- 

 bus concentrice sculptd, interstillis radiaiim cnberrime 

 minute striatis ; lateribas angulato-rotimdatis, postico 

 vkcfltxuom. 



The virgin Amphidesma. Shell oblong-ovate, thin, 

 subtransparent-white, sculptured concentrically with 

 rather distant thread-like plaits, interstices radiately 

 very closely minutely striated; sides angularly rounded, 

 posterior side scarcely flexuous. 



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



Hab. Basay, Isle of Samar, Pliilippines ; Cuming. 



A semitransparent white shell, sculptured with rather 



distant thread-like plaits. 



Species 50. (Mus. Cuming.) 



Amphidesma l.j;vis. Amph. tedCi subelliptico-ovatd, la- 

 tere antico multo longiore, postico rotundato, produdo, 

 subjlexuoso, sulco ab umbone ad marginem dectirrente ; 

 albd, lavigatd, sub lente minute decussatim striata, epi- 

 dermide tenuissimd nitente versus marginem indutd. 



The smooth Amphidesma. Shell somewhat elliptically 

 ovate, anterior side much the longer, posterior 

 rounded, produced, rather flexuous, with a groove 

 running down from the umbo to the margin ; white, 

 smooth, minutely decussately striated beneath the 

 lens, covered towards the margin with a thin shining 

 epidermis. 



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



Hab. Xipixapi, West Columbia (in sandy mud, at the 

 depth of ten fathoms) ; Cuming. 



A delicate smooth white species, of a peculiar sub-elliptic 

 ovate form. 



Species 51. (Mus. Cuming.) 



Amphidesma compta. AmpJi. testd orbicidari-ovatd, 

 compressd, requilaterali, lateribus rotmidatis, postico 

 vix fiexuoso ; alhidd, luteo-fuscescente obscure radiatd, 

 concentrice Urato-striatd, striis minutis impressis dense 

 radiatd. 



The NEAT Amphidesma. Shell orbicularly ovate, com- 

 pressed, equilateral, sides rounded, posterior scarcely 

 flexuous ; whitish, obscurely rayed with yellowish 

 light brown, concentrically ridge -striated, densely 

 rayed with minute impressed striae. 



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



Hab. ? 



Comparatively smooth in appearance, but elaborately 

 decussately sculptured beneath the lens. 



Species 53. (Mus. Cuming.) 



Amphidesma amcena. Amph. testd subtrigono-orbiculari, 



ventricosiusciild, tenelld, subcBquilaterali, latere postico 

 subproducto, paululmn fiexuoso ; alhidd, nmbonibus pur- 

 purascentibus ; concentrice flexuoso-striatd, striis minu- 

 tis radiantibus. 



The delicate Amphidesma. Shell somewhat triangu- 

 larly orbicular, rather ventricose, thin, nearly equi- 

 lateral, posterior side rather produced, a little flexu- 

 ous ; whitish, umboes purple-tinged ; conceutrically 

 flexuously striated, with minute radiating stria;. 



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



Hab. ? 



Sculptured with fine concentric ridge-like striae, similar 

 to the preceding species. 



Species 53. (Mus. Cuming.) 



Amphidesma simplex. Amph. testd oblongo-ovatd, la- 

 tere postico vix breviore, concentrice dense flexuoso-stri- 

 atd, striis mhiutissimis radiantibus decussatd ; rosaceo- 

 albd, ttmbonibus rosek. 



The simple Aaiphidesma. Shell oblong-oval, posterior 

 side scarcely shorter ; concentrically densely flexu- 

 ously striated, decussated with very minute impressed 

 stricB ; pinkish-white, umboes pink. 



Adams and Peeve, Zool. Voy. Samarang, MoU. p. 81. 

 pi. 24. f. 11. 



Hab. China Sea. 



A nearly equilateral TeUina-\)ke species, tinged with 

 pink, especially in the vicinity of the umboes. 



