ANODON. 
PLate 
Species 59. (Mus. Cuming in Brit.) 
ANODON INcERTUS. dn. testa oblongo-ovatd, inflata, te- 
nul, polita, prope umbones leviter concentrice rugatd, 
fasciis viridibus latis postice nigrescentibus radiata, 
interstitiis flavidis linearibus, intus alba ; latere antico, 
brevi, subrotundo ; latere postico elongato, margine dor- 
sali recto, cuneato, imargine laterali subconcavo, ter- 
mino elevato, obliqué truncato, margine ventrali versns 
terminum valide sursum acclivi, medio rectiusculo, um- 
bonibus planatis, tenuiter undulatis. 
THE UNCERTAIN ANODON. Shell oblong-ovate, inflated, 
thin, smooth, slightly concentrically wrinkled near 
the umboes, rayed with green, wide, posteriorly 
darkening bands, interstices yellowish, linear, inside 
white ; anterior side short, rather rounded ;_ posterior 
side elongated, with dorsal margin straight, cuneate, 
lateral margin subconcaye, elevated at the end, ob- 
liquely truncated, ventral margin towards the end 
strongly sloped upwards, rather straight in the mid- 
dle, umboes flat, finely undulated. 
Lea on Unio, vol. v. p. 158. pl. 6. f. 16. 
Anodonta imbecillis ?, Say. 
Hab. River Ohio. 
This shell, being equally inflated throughout its length, 
has something of a cylindrical form. 

Species 60. (Mus, Cuming in Brit.) 
ANODON EDENTULUS. 
tenui, levigatd, obscure olivaced, posticé et ad margines 
nigrescenti, ad umbones cupred, intus albido-lutescente ; 
latere postico oblique et obscure biangulato, ared post- 
angulari elevatd, subalatd, cuneatd, margine laterali 
An, testa subovatd, subcompressd, 
obliquo, subconcavo, termino acuminato, margine ven- 
trali equaliter convexo; latere antico supra subcuneato, 
umbonibus acute tuberculatis. 
THE TOOTHLESS ANoDON. Shell subovate, subcom- 
pressed, thin, smooth, dark-olive, blackish at the 
back and margins, copper-coloured at the umboes, 
yellowish-white within ; posterior side obliquely and 
obscurely biangular, postangular area elevated, sub- 
alate, cuneate, lateral margin oblique, slightly con- 
cave, end acuminated, ventral margin equally convex ; 
anterior side somewhat cuneate above, umboes with 

acute tubercles. 
September, 15 
XVII. 
Lea, MS. 
Anodon areolatus ?, Swains. Zool. Mlustr. 
Hab. North America. 

Species 61. (Mus. Cuming in Brit.) 
ANODON FRaGILIs. An. testd oblongd, tenui, subcompla- 
natd, utringue concentrice rugatd, obscure olivaced, ad 
umbones cupred; latere postico obliquo, acuminato, 
obscure biangulato, ared postangulari elevatd, margine 
dorsali recto, ad terminum rotundato, margine loterali 
perobliquo, termino inter angulos oblique truncato, 
margine ventrali versus angulum sursum acclivi, medio 
subcontracto, anticé subinflato ; latere antico subgquad- 
rato, wumbonibus tenuiter undulatis. 
THE FRAGILE ANopon. Shell oblong, thin, rather flat- 
tened, concentrically wrinkled on both sides, dark 
olive, copper-coloured at the umboes ; posterior side 
oblique, acuminated, obscurely biangular, postangular 
area elevated, dorsal margin straight, rounded at the 
end, lateral margin very oblique, end between tie 
angles obliquely truncated, ventral margin sloped up 
towards the angle, slightly contracted in the middle, 
rather inflated anteriorly ; anterior side subquadrate 
umboes finely undulated. 
Lamarck, Anim. sans vert., Anodonta, n. 4. 
Hab. River Ohio. 

Species 62. (Mus. Cuming in Brit.) 
Anopon NewrTonensis. Ax. testé oblonga, inflata, tenui, 
ad umbones et anticé concentricé rugald, omnino le- 
vigatd, olivaced, ad umbones cupred; latere postico lato, 
inflato, acuminatim producto, obliqué triangulato, an- 
gulo inferiori acuto, margine dorsali convexo, termino 
triangulato, margine ventrali versus angulum sursum 
acelivi ; latere antico subproducto, angusto, rotundo. 
Newtown Anopon. Shell oblong, inflated, thin, 
concentrically wrinkled at the umboes and in front, 
THE 
smooth in every part, olive, copper-coloured at the 
umboes; posterior side wide, inflated, acuminately 
produced, obliquely triangular, lower angle sharp, 
dorsal margin convex, the end triangular, ventral 
marein sloped up towards the angle; anterior side 
rather produced, narrow, rounded. 
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