Cex se hentia eA, 
PLATE Ey. 
Species 11. Fig. a, b. (Mus. Cuming, in Brit.) 
CasTALIA TuRGIDA, Cas. testa subovatd, tenui, levi- 
gatd, tumidda, prope umbones obscuré subradiatim 
costatd ; fusco-nigrescenti, intus salmoned ; latere 
postico rotundatim angulato, ared postangulart 
radiatim depresso; margine dorsali subdeclivi ; 
margine lateralt obliquo, versus angulum excavato ; 
umbonibus tumidis, prominentibus ; margine ven- 
trali postice rectiusculo, antice pauld acelivi ; 
latere antico breviusculo, margine dorsali brevi, 
cuneato, margine laterali subobliquo. 
Tue TurGip Castatia. Shell subovate, thin, smooth, 
tumid, obscurely sub-radiately ribbed near the 
umboes; blackish brown, salmon-coloured within ; 
posterior side with rounded angle, postangular 
area with a radiating depression; dorsal margin 
rather sloped, lateral margin oblique, excavated 
towards the angle; umboes tumid, prominent; 
ventral margin posteriorly rather straight, a little 
sloped in front; anterior side rather short, with 
dorsal margin short, cuneated, lateral margin sub- 
oblique. 
Hurr. Castelnau’s Expedition in South America, 
page 76, plate 14, fig. 10. 
Hab. Brazil. 
Of a more ovate form than any other species; thin, 
and obscurely wrinkled. 

Species 12. Fig. a, b. (Mus. ——?) (Copied.) 
CasTALIA acuTicosTaTa. Cas. testé subtrigond, com- 
press, olivaceo-subviridi, intis salmoned ; latere 
postico angulato, infra acuminato, costis subradi- 
antibus acutis subdistantibus ornato ; ared post- 


angulari parva, depressd, subexcavata ; latere untico 
breviort, rotundo, costellis minoribus radiato ; wm- 
bonibus prominentibus. 
THE SHARP-RIBBED CasTaLiA. Shell subtrigonal, com- 
pressed, greenish olive, salmon-coloured within ; 
posterior side angulated, acuminated below, orna- 
mented with subradiating, sharp, rather distant 
ribs; postangular area small, depressed, subexca- 
vated ; anterior side shorter, rounded, rayed with 
smaller ribs; umboes prominent. 
Huré.  Castelnau’s 
page 77, plate J4, fig. 3. 
Hab. Brazil. 
Expedition in South America, 
Species 13. Fig. a, b, c. (Mus. Cuming, in Brit.) 
CASTALIA DOLABELLA. 
SJlavescenti-viridi, 
Cas. testa tenui, tumidd, trigond 
levigatissimad, ints pallidé 
ceruled, dentibus tenuibus, anticis laceratis ; latere 
postico acute angulato, ante angulum complanato, 
area, postangwari depressd, pland subexcavato ; 
margine dorsali brevi, elevato, margine ventrali ad 
terminum acuminato ; latere antico brevi, sub- 
acuminato. 
THE DOLABELLA CasTaLia. Shell thin, tumid, trigonal, 
yellowish green, very smooth, pale bluish within ; 
teeth thin, the anterior ones lacerated; posterior 
side sharply angular, flattened in front of the 
angle; postangular area depressed, flat, subexca- 
short, elevated, ventral 
vated; dorsal 
margin acuminated at the end; anterior side short, 
margin 
subacuminated. 
SowWERBY. 
Hab. ——? 
This singularly formed, angular smooth shell is in 
the Cumingian collection without any assigned locality. 
April, 1869. 
