ANODON.—Puate XVII. 
Lea, Obs. on Unio, vol. i. p. 79. t. 21. f. 66. 
Hab. Newtown Creek, New Jersey, near Philadelphia. 
The undulations of the umbonal region are more elon- 
gated and regularly concentric in this species than in 4. 
fluviatilis. My. Lea’s original specimen being much older 
than that in the Cumingian cabinet (named by Mr. Lea), 
the angles and undulations are much more obscured. 

Species 63. (Mus. Cuming in Brit.) 
ANOoDON OrEGONENSIS. Aux. testd lata, subcomplanata, 
tenui, intus albd, ceruleo et flavido nebulatd, epider- 
mide obscure fusca, concentrice striato-laminatd, la- 
minis laceratis; latere postico expanso, biangulato, 
post angulos subalato, inter angulos truncato, margine 
dorsali elevato, cuneato, margine ventrali versus angu- 
lum elevato ; latere antico angustiore, superné subcu- 
neato, umbonibus divaricatim undulatis. 
Orreon Anopon. Shell broad, rather flat, thin, 
white within, clouded with blue and yellow, epidermis 
dull brown, concentrically striato-laminar, with the 
lamin ragged ; posterior side expanded, biangular, 
slightly alate behind the angles, truncated between 
them, dorsal margin elevated, cuneate, ventral margin 
elevated towards the angle; anterior side narrower, 
shghtly cuneate above, umboes divergently undu- 
lated. 
Lea, Obs. on Unio, vol. ii. p. 80. pl. 21. f. 67. 
THE 
Hab. Wahlamat, near its junction with the Columbia 
river. : 
A much broader shell than 4. cygneus, and concentri- 
cally striped and striated. 

Species 64. (Mus. Cuming in Brit.) 
Anopon Lucastr. dn. testa oblonga, tumidd, subcylin- 
draced, olivaced, nitenti, levigatd, ad latera leviter 
rugatd, antice pauciradiatd, intus ceruleo-iridescenti ; 
latere postico subattenuato, acuminato, obscure biangu- 
| lato, margine dorsali recto, subcuneato, margine ter- 
minali oblique curvilineari, margine ventrali equaliter 
convexd ; latere antico rotundo, umbonibus cupreis 
planulatis, tenuiter undulatis. 
Tue Lucas’s ANopon. Shell oblong, tumid, subcylin- 
drical, olivaceous, shining, smooth, lightly wrinkled 
at the sides, sparingly rayed in front, iridescent blue 
within ; posterior side rather attenuated, acuminated, 
obscurely biangular, dorsal margin straight, subeu- 
| neate, terminal margin obliquely curvilinear, ventral 
margin equally convex; anterior side rounded, um- 
boes copper-coloured, flat, finely undulated. 
More.er, Moll. ter. et fluv., ete. 
Hab. Algeria. 
Of nearly equal depth (or width) throughout, and 
equally tumid, so as to present a rather cylindrical ap- 
| pearance. 

