CASTALIA LATERIQUADRATA. 
CASTALIA.—P tate II. 
Species 10. (Mus. 

?) (Copied.) 
Cas. testd subcompressa, 
planatd, subtrigond, alté ; costis magnis subradi- 
antibus, prope laterem anticum angulatim diver- 
gentibus rugata ; latere postico valide angulato, 
tumiddé; ared postangulari radiatim obscuré sul- 
cata, margine dorsali elevato, declivi ; latere antico 
ad marginem ventralem acuminato, margine ven- 
trali rectiusculo. 

THE SQUARE-SIDED CASTALIA. 
D’Orpsieny. 
Hab. 
Shell sub-compressed, 
flattened, subtrigonal, elevated; wrinkled, with 
large subradiating ribs angularly divided near the 
anterior side; posterior side with a strong angle, 
tumid; postangular area obscurely radiately 
grooved, dorsal margin elevated, sloped ; anterior 
side acuminated at the ventral margin; ventral 
margin straight. 
Voyage dans l’Amérique Meridionale. 
River Amazon. 
