GAGS Tae Ey ix: 
Puate II. 
Species 6. (Mus. Brit.) 
Castatia CaroLinensis. Cas. testd parva, ovato-sub- | 
quadrata, solida, rugis acutiusculis subradiantibus 
via divergentibus impressd ; 
quadrata, margine dorsali recto ; margine laterali 
viz obliquo » margine ventrali pauld concavo ; latere 
latere postico sub- 
antico brevi, margine dorsali valde declivo. 
Tue Carotrna Castatra.—Shell small, ovate-sub- 
quadrate, solid, impressed with rather acute sub- 
radiating, scarcely divergent wrinkles; posterior 
side subquadrate, with dorsal margin straight ; 
lateral margin scarcely oblique; ventral margin 
a little convex ; anterior side short; dorsal margin 
much sloped. 
Sowersy. 
Hab, South Carolina. Shepherd. 
But for the localities, this little shell might be 
thought a young specimen of Castalia retusa. 

Species 7. Fig. a, b. (Mus. Brit.) 
CasTaLia QuapraTa. Cas. testd solidd, subquadratd, 
levigata ; stramined, intus subceruled ; ad wm- 
bones suleis subradiantibus acute angulatis im- 
ad 
marginem ventralem cuneato ; latere antico brevi, 
rotundo ; wmbonibus prominentibus, tumidis, sub- 
quadratis. 
pressis ; latere postico quadrato, angulato, 
THe square Casraria. Shell subquadrate, 
smooth, straw-coloured, bluish within, impressed 
solid, 
at the umboes with subradiating, acutely angu- 
lated, diverging sulci; posterior side square, 
angular, cuneated at the ventral margin ; anterior 
side short, rounded; umboes prominent, tumid, 
subquadrate. 
Sowerby. 
Hab. 

() 

Species 8. (Mus. Brit.) 
CasTaLia corpaTa. Cas. testd trigond, subcomplanata, 
subcompressd, obliqua, laevigata, prope umbones et 
medio rugis angulatis, subradiantibus medio con- 

vergentibus lyraté ; itis subceruled , latere pos- 
April, 
tico obliquo, ad marginem biangulato, ad umbones 
acute biangulato, area postangulari unisulcata, de- 
pressd; murgine dorsali rectiusculo, margine laterali 
obliquo ; latere wntico trigono, acuminato ; umbo- 
nibus subprominentibus, angulatis. 
Tue corparr Castanta. Shell trigonal, rather flat 
and compressed, oblique, smooth, wrinkled near 
the umboes and in the middle with angular sub- 
radiating ridges converging to the centre; bluish 
within ; posterior side oblique, with double angle 
towards the margin and a single sharp angle at 
the umboes; postangular area with a single 
groove, depressed ; dorsal margin rather straight ; 
lateral anterior side tri- 
margin oblique ; 
gonal, acuminated; umboes rather prominent, 
angular. 
Humrurey. MS. in Mus. Cum. 
Hab. British Guayana. 
The comparative flatness of the surface and sharp- 
ness of the umbonal angle, with the less tumidity of 
the upper part, distinguish this species from Castalia 
ambigua, although the two are confounded in many 
collections. 
Species 9. Fig. a, b. (Mus. —— ?) (Copied. ) 
CasTALIA MULTICOSTATA. Cas. testd subviridi, tenui, 
compressi, trigond, omnino costis depressis diva- 
ricatim divisis subradiantibus rugata ; latere pos- 
tico lato, subrotundatim angulato ; area postan- 
gulart sulco mediano impressé ; latere untico 
angusto, acuminato. 
THE MANY-RIBBED CasTaLia. Shell rather green, thin, 
compressed, trigonal, wrinkled all over with de- 
pressed, divergently divided subradiating ribs; pos- 
terior side wide, with a rather rounded angle; post- 
angular area impressed with a median groove; 
anterior side narrow, acuminated. 
Hure. South 
page 75, plate 14, fig. 4. 
Hab. Brazil. 
Castelnau’s Expedition in America, 
The wrinkles in this species are more subdivided 
than in most of the other species. 
1869. 
