U N I 0. 



Pl.VTE LXI. 



Species 303. (Mus. Taylor.) 

 Tnio coiMPBESsus. Uii. (cstii teuid, com/invw, hild, 

 miljcinieata, Imvi^/atd, luted, fascm latis el iiltvris au- 

 ffiisli.s viridilim radiafd, inlits laded, deulihiif: liitcrn- 

 Htiii>i lamiiiiitk, iiiil/rin hn-oiliKx, //nx/icls eloiigalis, 

 (li'iil'ilinx ciirdiiiaHliiis olillijiiis ,• lali'iv postico lalo, 

 ^iihliuiiido, xiipni tilatn ■ lalerr iiiitiro aiigudo, hrcvi, 

 iiiiiboiiibus niidulatim (nljercnliilis. 

 The compressed Unio. Shell thin, compressed, broad, 

 siibcuneate, smooth, yellowish, rayed with green 

 bands, some broad and others narrow, white within, 

 lateral teeth laminated, anterior short, postci'ior 

 elongated, cardinal teeth oblique; posterior side 

 broad, slightly tumid, winged above ; anterior side 

 narrow, short, uraboes tnbereulated in waves. 

 Le.\ on Unio, vol. i. pi. 20. f. 32. 

 /fab. Ohio. 



The specimen from which our figure is taken corre- 

 sponds with the original figure and description of Lea in 

 every respect, including the very peculiar teeth and iim- 

 boues. It is the only specimen I have seen that will so 

 (•(irrespond, although the name is attached to shells in 

 various collections. 



Species 304. (Mus. Sowerby.) 



U.Mo SECUUIS. Uh. testa crassd, compresm, obliqiw sitb- 

 Inrjoud, liilcd,fascus maculiferis subviridibus radiald, 

 iiiiHH lactc'd, dentilms crams; latere postico cunealo, 

 mque ad marginem ventralem arcuatim drrlivi el on- 

 (julaio, post angulum defleclo ; latere aiitico breris- 

 shiio, nn/bombus aciitis, incurvis, margine reiitrali pon- 

 tice acitmbiato, antice rotundo. 



The hatchet Unio. Shell thick, compressed, ob- 

 liquely subtrigonal, yellow, rayed with greenish 

 spotted bands, white within, teeth thick; posterior 

 side euneate, sloped convexly to the ventral marn-in 

 and angulated, turned down behind the angle ; an- 

 terior side very short, uuiboes sharp, incurved, ven- 

 tral margin posteriorly acuminated, rounded in 

 front. 



Le.v on Unio, vol. i. p. 51. pi. II. f. 27. 

 Unio depresMH, Rafinestpie. 



llab. liiver Ohio. 



This species is very distinct from all others. 



Species 305. (Mus. Sowerby.) 



Umio I'LENUS. Un. tesld crassd, alld, tmnidd, oblii/ne 

 siib/ni/ui/d, castaned, lamgald, distanter couceidric'c 

 J'd.sr'hild. el leviUr sidcald, intus salmoiied, margiiie 

 vardiiKili el di'iit'ilms crassis ; hitere poxlico obliqui' 

 aiignlato, post iiiiijiiluiii (iiigiislo, iiiargiiie dnrsull dr- 

 cUe'i, lerm'uio Immtl't siibni-iii,iinalo, Htanj'nir i:enlral'i 

 null- aiiijiiluui subex-cacato, medio tiimido, iniibouibns 

 rtecalis, dislniilibiiii, incurvis ; latere ailtico brevissimii, 

 niargiiie dorsali redo, cniiealo, niarglne laierali redo, 

 viargine veiilrali surstim acdivi. 



The plump Unio. Shell thick, elevated, tumid, obliquely 

 subtrigonal, chestnut-coloured, smooth, distantly con- 

 centrically banded and slightly grooved, salmon- 

 coloured within, cardinal margin and teeth thick ; 

 posti'rior side obliquely angular, narrow behind the 

 angle, dorsal margin sloped, basal end slightly aen- 

 minated, ventral nuirgin subexcavated in front of 

 the angle, middle tumid, umboes elevated, distant, 

 curved inwards ; anterior side very short, with dor- 

 sal margin straight, cinic-itc, lateral nuirgin straight, 

 ventral margin sloped upwards. 



Le.\ Obs. on Unio, vol. i. p. II'J. pi. 10. f 39. 



ffab. Tennessee river. 



Diifering frc 

 ventral margin, 

 terminus. 



U. ph'/iiis in altitude from umboes to 

 d in the more produced posterior basal 



Species 306. (Mus. Taylor.) 



Unio MDLTIKadiati'S. Un. lesld ucald, injlald, salidd, 

 siibaiirahlid, fasrii.s riridibiis latinscitlis liiicalim di- 

 dsi.\- radiald, inlus laded ; latere jioslico lato,valdein- 

 flalii, i.iariiiiie dorsali elevalo, alaformi, redo, cunealo, 

 aiarijuie feiitrali atujulaliui sursmii accliri ; latere an- 

 lico rotundo, umbonlhas iiijlalis, heribus. 



The many-uayei) Unio. Shell ovate, inflated, solid, 

 slightly orange, rayed with rather wide green bands, 

 divided in lines, uiilk-uhilc uitliin; posterior side 

 wide, nuieh inllaled, dorsal margin elevated, wing- 

 shaped, straight, euneate, ventral margin angularly 

 sloped iqiwards ; anterior side rounded, umboes in- 

 iiated, smooth. 



Lea, Obs. on I'nio. vol. i. pi. 10. f 3. 



llab. Biver Ohio. 



ISGS. 



