MODIOLA.— Plate VIII. 



arched, ratber thin, gibbous, smooth, posterior side 



obtusely rounded, anterior compressly produced ; 



shining-olive, tinged with purple. 

 Vohella subpurptirea, Duuker, Pro. Zool. Soc. 1856, p. 



362. 

 Hab. Senegal. 



Of a somewhat horny substance, and dark shining pur- 

 plish-olive colour. 



Fig. 45. (Mus. Cuming.) 

 A full-grown specimen of .¥. arcuatida, described at 

 Plate VI. Kg. 27. 



Species 46. (Mus. Cuming.) 

 MoDiOLA Petagnj;. Mod. testa elongatd, tenuksimd, 

 postice longitudinaliter striata, nilente-corned, antice 

 concentrice striata, pulchre iridescente-aruginosd, li- 

 neis ru/escentibtts undique palUde reticulata. 

 Petagn's Modiola. Shell elongated, very thin, posteri- 

 orly longitudinally striated, shining horny, anteriorly 

 concentrically striated, beautifully iridescent-verdi- 

 gris, faintly reticulated throughout with reddish lines. 

 ScACCHi, Phil. Enum. Moll. Sicil. vol. ii. p. 51. 

 Hab. Mediterranean, and Galveston, Texas. 



A beautifully delicate transparent shell, having the pos- 

 terior side horny and shining, while the anterior is of a 

 delicate verdigris-colour and iridescent. 



dio contractd, midique dense sulcata, lateribus rotunda- 

 tis, antico subangulato ; fulvo-castaned, postice niteiite- 

 corned, antice sparsim setigerd. 



The geooved Modiola. Shell oblong, gibbous, con- 

 tracted in the middle, densely grooved throughout, 

 sides rounded, anterior slightly angled ; fulvous-chest- 

 nut, posteriorly shining horny, anteriorly sparsely 

 bristly. 



Volsella submlcata, Duuker, Pro. Zool. Soc. 1856, p. 364. 



Eab. Bay of Manila ; Cuming. 



The form of this species is rather gibbous throughout, 

 the entire surface being closely finely grooved. 



Species 48. (Mus. Cuming.) 



Species 47. (Mus. Cuming.) 

 Modiola subsulcata. Mod. testa oblonga, gibbosd, me- 



MoDioLA GLABEKKIMA. Mod. testd subtrigono-elongatd, 

 tenui, lavigafd, nitente, latere postico parvo, attenuate, 

 antico gradatim latiore, margine oblique rotundato ; 

 pallide olivaceo-comed, terugineo-purpurascente radia- 

 tim lineatd et concentrice strigatd. 



The glossy Modiola. Shell somewhat triangularly 

 ovate, thin, smooth, shining, posterior side small, 

 attenuated, anterior gradually broader, obliquely 

 rounded at the margin ; pale olive-horny, radiately 

 lineated and concentrically streaked with light bronze- 

 purple. 



Folsella glaberrima, Pro. Zool. Soc. 1856, p. 363. 



Hab. Sydney. 



A very delicate horny shell, decussated with character- 

 istic lines and bands of red-bronze purple. 



