ANG OF DO Ne 
PLATE. X. 
Species 25, 
(Mus. Cuming in Brit.) 
ANODON cataracrus. An. testdé tenni, oblongo-ovald, 
concentrice subrugata, viridi, levigatd, inflata ; latere 
antico brevi, supra angulato, tufra rotundato, medio 
margine ventrali leviter convexo, umbonibus undula- 
tim rugatis ; latere postico producto, acuiminato, sub- | 
angustato, oblique angulato, post angulum viridi ni- 
grescenti radiato. — * 
THe cataract ANODON. 
centrically slightly wrinkled, green, smooth, inflated ; 
Shell thin, oblong-ovate, con- 
anterior side short, angular above, rounded beneath, 
middle with the ventral margin slightly convex, um- 
boes wavily wrinkled; posterior side produced, acu- 
minated, rather narrowed, obliquely angular, rayed 
with blackish-green behind the angle. 
Say. 
Hab. River Ohio. 
As compared with 4. Gesveri, this species is more acu- 
minated posteriorly. It is also wrinkled at the umboes. 
It differs from 4. plana, Lea, in being more deepened 
from apex to ventral margin. 

Species 26. (Mus. Cuming in Brit.) 
ANODON MopDEsTUs. An, testé subrhomboided, subcom- 
pressd, tenut, levigatd, leviter olivaced, posticé viridi 
vivide biradiatd, intuis subceruled ; latere antico subro- 
tundato, medio subdepresso, margine ventrali subsinuato, 
umbonibus parvis, acute tuberculatis ; latere postico 
oblongo, obscurissime angulato, margine dorsali subro- 
tundo, margine laterali obliquo, termino subacuminato. 
MODEST ANODON. 
compressed, thin, smooth, liglt-olive, with two bright 
green posterior rays, rather bluish within; anterior 
side nearly round, middle slightly depressed, with 
ventral margin a little sinuous, the umboes small, 
sharply tuberculated ; posterior side oblong, very ob- 
THe Shell subrhomboidal, rather 
scurely angular, with dorsal margin rather rounded, 
lateral margin oblique, acuminated at the end. 
Lea, Obs. vol. viii. p. 46, pl. 63. 
Hab, Pond near Kalamazoo, Michigan. 

Species 27. (Mus. Cuming in Brit.) 
ANODON RETICULATUS. 

An. testi subrhomboided, sub- 
June, 
compressa, fusco-nigrescenti, rugis tenuibus concentricis 
et slriis subdistantibus radiantibus reticulata, intis 
glaucd ; latere antico subangustato, medio subdepresso, 
margine subsinuato, umbonibus levigatlis, olivaceis ; 
latere postico oblongo, oblique bisulcato, obscure angu- 
lato, margine dorsali recto, margine lateral obliquo, 
termino vix acuininato. 
THE RETICULATED ANODON. Shell subrhomboidal, ra- 
ther compressed, blackish-brown, reticulated with 
thin concentric wrinkles and subdistant radiating 
striae, glaucous within; anterior side subangular, 
middle slightly depressed, with margin a little sinuous, 
umboes smooth, olive; posterior side oblong, obliquely 
bisuleated, obscurely angular, dorsal margin straight, 
lateral margin oblique, end scarcely acuminated. 
GOULD. 
Hab. River Amazon. 
This shell is easily distinguished by its reticulated sur- 
face. 

Species 28. (Mus. Cuming in Brit.) 
ANODON AREOLATUS. dn. test oblique ovatd, hianti, in- 
flata, levigatd, olivaced, tenuni, imequilaterali ; latere 
antico brevi, infra sursum acelivi, termino rotundo, 
supra cnneato, margine dorsali brevi, recto, in aream 
complanatan depresso, medio subdepresso ; latere pos- 
tico wiflato, perobliquo, expanso, oblongo, oblique bi- 
angulato, post angulum viridi radiato, margine dor- 
sali elevato, ligamento infosso, margine laterali obli- 
quo, termino subtruncato. 
Tue AREOLATE ANODON. Shell obliquely ovate, gaping, 
inflated, smooth, olive, thin, inequilateral; anterior 
side short, sloping upwards beneath, rounded at the 
end, cuneated above, with dorsal margin short, 
straight, depressed into a flattened area, middle sub- 
depressed ; posterior side inflated, very obliquely ex- 
panded, oblong, obliquely biangular, rayed with green 
behind the angle, dorsal margin elevated, ligament 
imbedded, lateral margin oblique, subtruncated at 
the end. 
SOWERBY. 
flab. 

Differs from A. Blainvilled in the greater inequality of 
the sides aud obliquity of the posterior, and in the narrow 
flattened area which characterizes the hinge. 
