ANO 
PLATE 
Species 122. (Mus. Brit.) 
Awopon Cuminert. An. testd rhomboided, subcomplanata, 
crassa, fusco-nigricanti, polita, prope umbones obscuré 
divaricatim rugatd, intis et ad umbones cupred ; 
latere antico brevi, angusto, margine dorsali recto, 
depresso, cuneato, ventrali surs&m acclivi ; medio 
planulato, umbonibus parvis, margine ventrali recto ; 
latere postico tumidiusculo, acuté biangulato, inter et 
post angulos planulato, ad terminum truncato. 
Cumina’s Anopon. Shell rhomboidal, rather flat, 
thick, blackish brown, polished, near the umboes 
obscurely divergently wrinkled, within and at the 
umboes coppery; anterior side short, narrow, 
with dorsal margin straight, depressed, cuneate, 
ventral sloped upward; middle flattened, umboes 
small, ventral margin straight; posterior side 
rather more tumid, acutely biangular, between 
and behind the angles flattened, truncated at the 
end. 
Lea. MS. Mus. Brit. 
Hab, Malacca. 
Species 123. (Mus. Brit.) 
ANODON TENEBRICOSUS. An. testa oblonga, subcylindraced, 
olivaceo-fuscd, striata, rugosd, solidd, intés cupred ; 
latere antico brevi, angusto, margine ventrali sinuato, 
hianti ; latere postico elongato, subquadrato, recto 
oblique truncato ; umbonibus subretusis, cupreis. 
THE DARKENED Anopon. Shell oblong, subcylindrical, 
olive-brown, striated, rugose, solid, coppery with- 
in; anterior side short, narrow, with ventral 
margin sinuated, gaping; posterior side elongated, 
subquadrate, straight, obliquely truncated; um- 
boes subretuse, coppery. 
bea, Ann. Pho'Tr;, 1837, t- 12; £36. 
Hab. River Parana. 
The sinus in the anterior margin gives a twisted 
appearance to the more mature specimens of this 
species. 

DON. 
XXXI. 
Species 124. (Mus. Brit.) 
ANODON BREVIS. An. testd tumidd, crassa, brevi, fusco- 
nigricanti, sinuatim striata, intus aurantid, margine 
crasso ; latere antico tumido, rotundo ; latere postico 
oblongo, subrostrato, obscure biangulato, ad terminum 
acuminato. 
sHort Anopon. Shell tumid, thick, short, blackish 
brown, sinuously striated, orange within, with thick 
THE 
margin ; anterior side tumid, rounded; posterior 
side oblong subrostrated, obscurely biangular, 
acuminated at the end. 
Sowersy. 
Hab. Rio Plata. 
This compact little species is prettily marked with 
orange within, and is noticeable for the rounded bulk 
of the anterior side. 

Species 125. (Mus. Brit.) 
ANopon ANSERINUS. An. testd obliqué subovata, magna, 
inflata, polita, pallidé flavido viridi ; postice fasciis 
viridibus radiata, intus iridescent’; latere antico 
brevi, contracto, ad marginem ventralem hianti ; 
medio subcompresso, umbonibus purpureis, prominen- 
tibus, ad apices leviter undulatis; latere spostico 
expanso, inflato, leviter biangulato, margine dorsali 
recto, elevato, alato, margine terminalt subtruncato. 
Tue Goose's Anopon. Shell obliquely subovate, large, 
inflated, polished, pale yellowish green, rayed 
posteriorly with green bands, iridescent within; 
at the 
umboes 
at the 
apices ; posterior side expanded, inflated, slightly 
biangulated, dorsal margin straight, elevated, 
winged, terminal margin subtruncated. 
Sprx. Test. Brasil., pl. 21. 
Hab. Brazil. 
More depressed in the middle, and more oblique than 
An. Blainvilleanus. 
anterior side short, contracted, gaping 
ventral margin; middle subcompressed, 
purple, prominent, slightly undulated 
June, 1870. 
