AEN OUD: ON. 
PLATE 
Species 186. (Fig. a, 6, Mus. Brit.) 
Aynopon Sruartt. An. testd parvd, tenui, levigatd, 
ovali, fumeo-fuscd vel cupreo-aured, postice radiata ; 
latere antico semirotundo, brevi ; medio subcom- 
presso, umbonibus parvis, acuminatis ; latere pos- 
tico producto, obscure angulato, acuminato, margine 
dorsali rectitisculo, ventrali inflato, verstiis terminum 
surstim acclivi. 
Struart’s Anopon. Shell small, thin, smooth, oval, 
smoky-brown, or coppery-gold, rayed posteriorly ; 
anterior side semirotund, short; middle subeom- 
pressed, umboes small, acuminated ; posterior side 
produced, obscurely angular, acuminated, dorsal 
margin rather straight, ventral inflated, sloped 
upward towards the end. 
Apams and ANG@As. 
Hab. ? 
Pro. Zool. Soc. 


Species 187. (Mus. Brit.) 
Anopon ScuomBurcianus. An. testd brevi, altd, subin- 
flatd, fumeo-stramined, tenuissime concentricé et 
radiatim striata; intus vivide iridescenti, latere 
antico parvo, rotundo ; wmbonibus inflatis, mar- 
gine ventrali convexo ; latere postico expanso, suban- 
gulato, supra angulum lird conspicud radiato, 
margine dorsali elevato, laterali obliqué trun- 
cato. 
Scuombpure’s Anopon. Shell short, elevated, subin- 
flated, smoky-straw-coloured, very finely concen- 
trically and radiately striated; vividly iridescent 
within; anterior side small, rounded, with the 
umboes inflated, ventral margin convex ; posterior 
side expanded, subangular, above the angle rayed 
with a conspicuous ridge, dorsal margin elevated, 
lateral obliquely truncated. 
Sowersy. 
Hab, British Guiana. 
This species, interesting for the distinct ridge above 
its posterior angle, was collected by R. H. Schom- 
burg, Esq. 

Species 138. (Mus. Brit.) 
An. testa  ovato-globosd, recta, 
inflata, pallidé olivaced, sparsim 
ANODON  VIRENS. 
tenut, valdé 


XXXIV. 
radiata, levigatd, subcequilaterali, intus ceruled ; 
latere antico rotundo, medio inflato, umbonibus 
rotundis, subcentralibus, ad apices tenuiter tuber- 
culato-undulatis ; latere postico longiusculo, angu- 
lato, post angulum viridi nigricanti radiato, mar- 
gine dorsali brevi, recto, laterali obliquo, terminali 
subtruncato, ventrali surstim acelivi. 
Tue verpant Anopoy. Shell ovate-globose, straight, 
thin, much inflated, pale olive, sparingly rayed, 
smooth subequilateral, bluish within; anterior 
side round, middle inflated, umboes round, sub- 
central, finely undulated, with tubercles near the 
apices; posterior side rather the longer, angu- 
lated, rayed behind the angle with blackish green, 
dorsal margin short, straight, lateral oblique, 
terminal subtruncated, ventral sloped upward. 
Lea. Obs. on Unio, vol. v. p. 46, pl. 28, f. 53. 
Hab, River Euphrates. Red River, Alexandria. 
There is a fine series of this globular species in the 
drawers of the British Museum. 
Species 159. (Mus. Smithson. Inst.) 
Awopon Kennertevi. An. testd subcylindraced, oblonga, 
tenuissimd, subdiaphand, recta, tenuidd, valdé in- 
equilateral, luteo-olivaced, striata ; intis albidé ; 
latere antico brevissimo, subtruncato ; medio sub- 
complanato, umbonibus subterminalibus, retusis, ad 
apices minutissime undulatis, margine ventrali 
recto ; latere postico producto, obtusissime biangu- 
lato, area postangulari subtrigono, elevato. 
Kennertey’s Anopon Shell subcylindrical, oblong, 
very thin, subdiaphanous, straight, whitish within; 
anterior side very short, subtruncated ; middle a 
little flattened, umboes nearly terminal, retuse, 
very minutely undulated at the apices, ventral 
margin straight; posterior side produced, very 
obtusely biangulated, post-angular area subtri- 
gonal, elevated. 
Lea. Obs. on Unio, vol. viii. p. 112, pl. 18, fig. 256. 
Hab. Chiloweyuck depot, near Puget Sound, Wash- 
ington Territory. 
Collected in the above locality by C. B. Kennerley, 
Ksq. 
June, 1870. 
