AON OTD ON. 
PuLaTe XXX. 
Species 117. (Mus. Wheatley.) 
Anopon Wyant. An. testd ellipticd, subinflata, 
crassa, anticé crassissimd, cinnamomed, subrugosa ; 
intus subrosed, vivide iridescenti ; latere antico 
angusto, medio subcontracto ; latere postico oblique | 
inflato, lira elevatd oblique radiato, ad terminum 
acuminato, margine ventrali surstim acclivi. 
Wrman’s Anopon. Shell elliptic, subinflated, thick, 
anteriorly very thick, cinnamon, rather rough ; 
rosy and very iridescent within; anterior side 
narrow, middle rather contracted, posterior side 
obliquely inflated, obliquely rayed with a raised 
ridge, acuminated at the end, with ventral margin 
sloped upwards. 
Lea. Obs. on Unio, vol. x. p. 26, pl. 44, f. 294. 
Hab. Uruguay River, South America, 
Species 118. (Mus. Lea.) 
ANODON RuUBICUNDUS. An. testd subrotundd, levigatd, 
alata, subequilaterali, inflata, solidd, tenebroso 
rufo-fuscd, intus rufo-salmoned, iridescenti ; latere 
antico parvitusculo, rotundo ; umbonibus rotundis ; 
latere postico alato, cuneato, liris duabus radiato. 
Tue rvpicunp Anopon. Shell subrotund, smooth, 
winged, subequilateral, inflated, solid, dark red 
brown, reddish salmon within, iridescent; anterior 
side rather small, round; umboes round; pos- 
terior side winged, cuneated, rayed with two 
ridges. 
Lea. Obs. on Unio, vol. x. p. 28, pl. 46, f. 299. 
Hab. Uruguay River, South America. 
Remarkable for its rounded and alate form, and the 
reddish tint of its pearly lining. 

Species 119. (Mus. Wheatley.) 
Anopon Forsestanus. An. testd oblonga, levigatd, 
subquadratd, crassiisculd, inflata, luteo fusca, 
polita, intus albidd, vivide iridescenti; latere 
antico producto, angustiort, margine dorsali de- 
presso, recto; medio vix planulato, umbonibus 
plenis, margine ventrali recto ; latere postico sub- 
June, 18 
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expanso, oblongo, subquadrato, rotundatim angu- 
lato, margine dorsale elevato. 
Forses’s Anopon. Shell oblong, smooth, subquadrate, 
rather thick, inflated, yellowish brown, polished, 
whitish and very iridescent within; anterior side 
produced, narrower, dorsal margin depressed, 
straight; middle very slightly flattened, umboes 
full, ventral margin straight; posterior side 
slightly expanded, oblong, subquadrate, roundly 
angular, dorsal margin elevated. 
Lea. Obs. on Unio, vol. x. p. 29, pl. 47, f. 301. 
Hab. Uruguay River, South America. 
This shell is distinguished by its quadrate oblong 
form. 

Species 120. (Mus. Wheatley.) 
Anopon Amazoniensis. An. testd transverse elongatd, 
crassa, ventricosd, recta, fusco-nigricanti, minute 
striata, intts alba, valdé iridescenti ; latere antico 
brevi, rotundo, medio tumido, margine ventrali 
recto; latere postico elongato, acuminato, tri- 
costato. 
Amazon ANODON. 
thick, 
minutely striated, white, very iridescent within ; 
THE Shell transversely elongated, 
ventricose, straight, — blackish-brown, 
anterior side short, round, middle tumid, ventral 
margin straight; posterior side elongated, acu- 
minated, three-ribbed. 
Lea. Obs. on Unio, vol. x. p. 32, pl. 46, f. 300. 
Hab, Upper Amazon, Brazil. 
An. 
ficured as An. Amethystus, mihi, sp. 95, in having 
Differing from Wheatleyi, Lea, erroneously 
three posterior ridges, and in not having the cinnamon- 
coloured epidermis and pinky interior. 

Species 121. (Mus. Lea.) 
Anopon UruGuayensis. An. testd brevi, ovata, crassa, 
inflata, tenebroso olivaced, inttis cceruleo-albd ; 
latere antico brevissimo, subrotundo, margine dor- 
sali depresso, ventrali sursim acclivi, medio rotundo, 
umbonibus subelevatis ; latere postico expanso, ob- 
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