DIONE.— Plate XI. 



riifo copiose radicdd, coucentrice dense striata, maryiiie 

 venti-ali, luniiht et area Ugamenti ustulato-purpurek. 



The subpelluciu Dione. Shell somewhat obliquely 

 ovate, rather compressed, thin, fulvous white, co- 

 piously rayed with rust-red, couceutrically densely 

 striated, ventral margin, lunule, and ligamentary area 

 scorched purple. 



Cjltlierea snhpellucida, Sowerby, Thes. Conch, vol. i. p. 639. 

 pi. 133. f. 136. 

 Dione suhpellucida, Deshayes. 



llah. Island of Luzon, Pliilippines ; Cuming. 



Kather broad in dimensions from the umboes to the 

 ventral margin, which, together with the lunule and liga- 

 mentary area, are strongly tinged with scorched livid 

 purple. 



Species 53. (Mus. Cuming.) 



Dione cKOCEA. Bion. testa globoso-subcordatd, tenui- 

 ciild, eximie croced, ant vitelliiw, versus nmbones ro- 

 sacea tinctd, Iteviffotd, niiente, coiictiiirici dense ieniii- 

 striatd. 



The saffron Dione. Shell globosely snijcordate, rather 



thin, delicate saffron, or yolk, tinged with rose to- 

 wards the umboes, smooth, shining, concentrically 

 densely finely striated. 



Deshayes, MS. in Mus. Cuming. 



Hob. Philippine Islands ; Cuming. 



Coloured both within and without with a rose-tinged 

 salfron, inclining to a wann yolk-yelloiv. 



Species 54. (_Mus. Cuming.) 



Dione erl'BEScens. Bimi. testa ghboso-cordatd, tenui, 

 ivfatd, lacted, versus nmbones roseo-tinctu, nitente, 

 conccntrice dense lirato-striatd, Itmntd ampld, iridis- 

 tinetd. 



The blushing Dione. Shell globosely cordate, thin, 

 inflated, cream colour, tinged with rose towards 

 tlie umboes, shining, concentrically densely ridge- 

 striated, lunule large, indistinct. 



Hab. Ceylon ; E. L. Layard. 



Somewhat like the preceding species in general aspect, 

 but more heart-shaped, while, on examination with the 

 lens, the surface will be found to be sculptured concentri- 

 caUv with distinct ridges. 



