ANOS DSO ON: 
Prate XII. 
Species 36. (Mus. Cuming in Brit.) 
Anopon pouitus. An. testa oblique ovata, subalatd, 
compress@, politd, obscuré olivaced, medio leviter ra- 
diatim striata ; latere postico lato, expanso, elevatin 
angulato, margine dorsali elevato, ad terminum cunea- 
to, margine laterali obliquo, termino acnminato, mar- 
gine ventrali ad terminum sursum acclivi, tum valde 
convexo ; latere antico brevi, angusto, termino rotun- 
do, margine dorsali brevissimo, euneato, umbonibus 
concentrice rugatis. 
THE poLIsHeD ANopoN. Shell obliquely ovate, sub- } 
alate, compressed, polished, obscurely olivaceous, 
lightly radiately striated in the middle ; posterior side 
wide, expanded, with a raised angle, dorsal margin 
elevated, terminating in an angle, lateral margin ob- 
lique, acuminated at the end, ventral margin sloping 
upwards at the end, then very convex ; anterior side 
short, narrow, rounded at the end, dorsal margin very 
short, cuneate, umboes concentrically undated. 
Movsson. 
Hab. Siam. 


Species 37. (Mus. Cuming in Brit.) 
ANODON CHARPENTIERT. An. testa tenui, levigatd, stra- 
mined, inflata, alata ; latere postico expanso, biangu- 
lato, ared postangulari compressa, elevata, trigond, 
margine dorsali elevato, cuneato, margine laterali ob- 
liqué subconvexo, termino truncato, margine ventrali 
ad terminum sursum acelivi, tum inflato, medio con- 
tracto ; latere antico brevissimo, angusto, rotundo, | 
umbonibus planulatis, concentricé rugatis. 
CHARPENTIER’S ANODON. Shell thin, smooth, straw- 
coloured, inflated, alate; posterior side expanded, bi- 
angular, with postangular area compressed, elevated, 
trigonal, dorsal margin elevated, cuneate, lateral mar- 
gin obliquely subeconvex, truncated at the end, ven- 
tral margin sloping upwards at the end, then inflated, 
contracted in the middle; anterior side very short, 
narrow, rounded, umboes flattened, concentrically 
wrinkled. 
Kiisrer. 
Anodon tumida, Kiister, included. 
On carefully comparing specimens believed to represent 
Kiister’s two species, I am obliged to conclude that there 
is no essential difference between them. 


Species 38. (Mus. Cuming in Brit.) 
ANoDON CarLiaupit. An. testd rotunda, superne an- 
gulata, inflatd, crassa, olivaceo-viridi, levigatd, ad 
latera concentric? minutissime rugatd, radiatim tenui- 
striata ; latere postico magno, alato, margine dorsali 
in alam expanso ; latere antico brevissimo, contracto, 
margine dorsali cuneato, declivi, wnbonihus rotundis, 
levigatis, prominentibus. 
CaILLatp’s ANopon. Shell rounded, angular above, 
inflated, thick, olive-green, smooth, concentrically 
very minutely wrinkled at the sides, radiately finely 
striated; posterior side large, alated, dorsal margin 
expanded into a wing ; 
¢; anterior side very short, con- 
tracted, with dorsal margin wedge-shaped, sloping, 
umboes rounded, smooth, prominent. 
Lea, Obs. vol. x. p. 31. pl. 45. f. 297. 
Hab. Brazil, M. Caillaud. 
The rounder forms of Anodon latimarginatus, etc., or 
A. rotundus, Spix, are quite distinct from this shell, 
which, having no hiatus in front, can scarcely be con- 
sidered as even belonging to the Lela group. 

Species 39. (Mus. Cuming in Brit.) 
ANopon ontusvs. dn. testd obscure olivaced, postice vi- 
vidi radiata, ovali-subquadratd, inflaté, concentricé 
striaté, inlis alba, vivide iridescente ; latere postico 
expanso, inflato, termino lato, subquadrato, medio con- 
tracto, compresso, umbonibus rotundis, prominentibus, 
levigatis, subincurvis ; latere antico brevi, angusto, 
acuminatim rotundo. 
OBTUSE ANODON. 
with grey, oval-subquadrate, inflated, concentrically 
striated, within white, brilliantly iridescent; poste- 
rior side expanded, inflated, the end broad, subquad- 
THE Shell dull olive, rayed posteriorly 
rate, contracted in the middle, compressed, umboes 
rounded, prominent, smooth, curved slightly for- 
wards; anterior side short, narrow, acuminately 
rounded. 
SPix. 
Hab. Brazil. 

Species 40. (Mus. Taylor.) 
ANopoN simpLicipus. dx. testa tenui, inflaté, pallidé 
stramined, levigatd, medio contract, compressa, 1're- 
gulariter ovali; latere postico elongato, biangulato, 
June, 1867. 
