AWN OLDE ON. 
IPT ATE MVE 
Species 10. (Mus. Brit.) 
ANODON puLVINATUS. An. testd subrotundd, ovatd, 
valde inflatd, concentricé lineatim strigatd, olivaced, 
subiridescenti, leviter radiaté ; latere antico acute 
angulato, late hianti, margine dorsali recto, margine 
ventrali subsinuato, surstim acclivi, umbonibus rotun- 
datis, prominentibus ; latere postico biangulato, mar- 
gine dorsali elevato, recto, angulato, margine ventrali 
valde convexo. 
THE VERY FULL ANODON. Shell rather round, ovate, 
much inflated, concentrically linearly striped, olive, 
slightly iridescent, lightly rayed; anterior side 
acutely angular, widely gaping, dorsal margin 
straight, ventral margin rather sinuous, sloping up- 
wards, umboes round, prominent; posterior side bi- 
angular, dorsal margin elevated, straight, angular, 
ventral margin very convex. 
Hure, (Leila,) Exp. Amér. du Sud. 
Hab. Aga and Rio Janeiro. 

Species 11. (Mus. Cuming in Brit.) 
ANODON SUBORBICULATUS, An. testd compressa, magni, 
late expansd, conceatrice distanter rugatd, obscure 

olivaced, fusco-subviridi concentricé fasciatd, fuscit 
angustis numerosis radiald, margine dorsali utrinque 
oblique recto, umbonibus parvis, compressis, margine 
ventrali convexo ; latere antico supra angulato, infra 
sursum acclivi; latere postico biangulato, termino 
acuminato, oblique subtruncato, super angulos alato, 
margine laterali concavo, margine ventrali sursium 
validé acelivi. 
THE SUBORBICULAR ANODON. Shell compressed, large, 
broadly expanded, concentrically distantly wrinkled, 
dull olive, concentrically banded with greenish- 
brown, rayed with numerous narrow bands, dorsal 
margin obliquely straight on both sides, umboes 
small, flat, ventral margin convex; anterior side 
angular above, sloping upwards beneath; posterior 
side biangular, acuminated at the end, obliquely sub- 
truncated, winged above the angles, lateral margin 
concave, ventral margin strongly sloping upwards. 
Say, Amer. Conch. t. 11. 
Hab. River Oregon. 
This species, expanded in form and rather resembling 
A. gibba, is much more compressed, has very small, fat 
umboes, and no sinus in front. 

April, 1867. 
