AP NCOUDE ON. 
PLATE 
Species 41. (Mus. Cuming in Brit.) 
ANODON ATROVIRENS. 
flatd, lavigatd, concentricé leviter rugaté et minute 
strigatd, obscuré olivaced, ad latera nigrescenti, pos- 
tice nigro biradiatd, prope umbones aurantio-subfuscd, 
intus subceruled ; latere postico biangulato, expanso, | 
margine dorsali subelevato, cuneato, margine laterali 
obliquo, margine terminali truncato, margine ventrali 
inflato, ad terminum valde sursum acclivi ; latere an- 
tico brevi, gradatim angustato, margine dorsali recto, 
margine ventrali longé sursum acelivi, uimbonibus sub- 
An. testé obliqué subovatd, in- | 
compressis, subconcentricée undulatim rugatis. 
THE DARK-GREEN ANoDON. Shell obliquely subovate, 
inflated, smooth, concentrically lightly wrinkled and 
minutely striped, dull olive, inclining to black at the 
sides, with two dark rays at the back, orange-brown 
near the umboes, bluish within; posterior side bi- 
angular, expanded, dorsal margin slightly raised, 
cuneate, lateral margin oblique, terminal margin | 
truncated, ventral margin inflated, much sloping up- | 
wards at the end; anterior side short, gradually nar- | 
rowed, ventral margin sloping a long way upwards, 
umboes subcompressed, somewhat concentrically, un- 

dulately rugose. | 
SHUTTLEWORTH. 
Hab. Lago di Mosano. 
This shell has fine concentric marks, which are most 
conspicuous in the lightest parts, and which distinguish it 
sufficiently from Anodon cygneus, which it otherwise ra- 
ther resembles. 

Species 42. (Mus. Cuming in Brit.) 
ANODON suBcRAssa. dn. testd subrhomboided, oblonga, | 
subcrassd, obscure fusca, levigatd, antice concentricé 
rugatd, intus subpurpured ; latere postico oblongo, ro- | 
tundatim angulato, margine-dorsali elevato, recto, 
margine laterali obliqué truncato, medio contracto, | 
compresso ; latere antico brevi, rotundo, umbonibus 
prominentibus, levigatis, subpurpureis. 
Tue THICKISH ANODON. Shell subrhomboidal, oblong, 
rather thick, dull brown, smooth, concentrically 
grooved in front, purplish within; posterior side ob- 
long, roundly angular, dorsal margin — elevated, 
straight, lateral margin obliquely truncated, middle 
contracted, compressed; anterior side short, round, 
umboes prominent, smooth, purplish. 

XIII. 
Lea, Obs. vol. vii. pl. 33. f. 115. 
Hab. Isl. Luzon, Philippines. 
Species 43. (Mus. Cuming in Brit.) 
ANODON TENEBROSA. 
compressa, solidd, concentricé tenuiter rugatd, viridi- 
An. testa oblonga, subcuneata, 
cerulescenti, postice nigro radiata ; latere postico ob- 
longo, lato, superné angulato, marginibus dorsalibus ct 
ventralibus rectiusculis, area postangulari compressa, 
umbonibus parvis, acuminatis, subviridibus ; latere an- 
tico brevi, angusto, subacuminato. 
THE DarK ANovoN. Shell oblong, slightly cuneate, 
compressed, solid, concentrically finely wrinkled, 
bluish-green, posteriorly rayed with black; posterior 
side oblong, broad, angular above, dorsal aud ventral 
margins rather straight, postangular area compressed, 
uwmboes small, acuminated, greenish; anterior side 
short, narrow, subacuminated. 
Say. 
Hab. N. America. 
This rather flat, Modiola-shaped shell is unlike others 
in form and general appearance. In colour it is bluish- 
green. 

Species 44. (Mus. Cuming in Brit.) 
ANODON IMPLICATUS. dn. testd tenui, irregulariter 
ovatd, concentrice inequaliler rugatd, olivaced, obscure 
radiata, intus albd flavescenti ; latere postico acunii- 
nato, obscure biangulato, imargine dorsali recto, mar- 
gine laterali concavo, obliquo, termino obliqué truncato, 
margine ventrali @qualiter convead ; lJatere antico 
subacuminato, margine dorsali recto, umbonibus sub- 
centralibus, subprominentibus, tuberculis magnis un- 
datis armatis. 
PLAITED ANopON. Shell thin, irregularly oval, con- 
centrically unequally wrinkled, olive, obscurely rayed, 
yellowish-white within; posterior side acuminated, 
THE 
obscurely biangular, dorsal margin straight, lateral 
margin concave, oblique, obliquely truncated at the 
end, ventral margin equally convex ; anterior side 
subacuminated, dorsal margin straight, umboes sub- 
central, rather prominent, armed with large, undu- 
lating tubercles. 
Say. 
Hab. ——? 
