ANODON ANGULATUS. 
THE 
Lea, 
Hab. 
Anopon HeErcuLeus. 
AENSOSDEO UN. 
Prats III. 
Species 6. (Mus. Cuming in Brit.) 
An. testa cuneiformi, tenui, tu- 
mida, intis pallidé fulvd, extiis sublevigata, radiatin 
substriatd, antice pallidé viridi, postice nigrescenti ; 
latere antico brevi, anyustato, subacuminato, margine 
ventrali recto; latere postico lato, angulato, angulo 
carinato, elevato, post angulum carina obscura radia- 
to, termino acuto, margine laterali obliquo, margine 
dorsali elevato, recto. 
ANGULAR ANoDON. Shell wedge-shaped, thin, tu- 
mid, pale fawn-coloured within, rather smooth witli- 
out, radiately substriated, pale-green in front, black- 
ish at the back; anterior side short, narrow, subacu- 
minated, ventral margin straight; posterior side 
wide, angular, with keeled, elevated angle, rayed 
with an obscure keel behind the angle, end acute, 
lateral margin oblique, dorsal margin elevated, 
straight. 
Obs. Unio, 2. p. 97. pl. 16. f. 52. 
River Oregon and California. 

Species 7. (Mus. Cuming in Brit.) 
An. testa magna, oblique ovati, 

THE 
ampld, tenui, concentrice irregulariter rugata, epider- 
mide nigrescenti, postice striata, intis albido-flavida, 
margine cardinali uni-laminato ; latere antico breviori, 
margine dorsali concavo, ad terminum angulato, margine 
terminali rotundo, margine ventrali arcuato ; latere 
postico producto, subexpanso, margine dorsali concavo, 
ad terminum subalato subangulato, margine lateral 
concavo, termino producto, acuminato, sursum acclivi, 
umbonibus plicatis. 
Hercuizan ANopon. Shell large, obliquely ovate, 
full, thin, concentrically irregularly wrinkled, with 
blackish epidermis, striated posteriorly, yellowish- 
white within, with a single lamina on the hinge mar- 
gin; anterior side shorter, with dorsal margin con- 
cave, angular at the end, terminal margin rounded, 
ventral margin arched ; posterior side produced, sub- 
expanded, with dorsal margin concave, slightly 
winged, and subangular at the end, lateral margin 
concave, produced at the end, acuminated, sloping 
upwards, umboes plicated. 
GERTSFORD ? 
Hab. 
A 
? 

single valve of this large shell, named as above, is in 
the late Mr. Cuming’s cabinet without stated locality. 

April, 1867. 
