U N I 



Species 293. (Mus. Tnvlov.) 



I'Nio suPERBUS. Uii. testa suhijlohond, teiiiii, iiijlatd, 

 ahitii, st ramhieil, jwstiee fasciis viriJi/jus rmHata, intus 

 alhiilo-xnJjcanled ; latere pod'wo injlafo, expanse, 2'ro- 

 fundi aiigulato, marrjine dorsali clevalo, sitljcompresso, 

 c/dieato, maryine laterali cniiealo, tenuiiio ad anyu- 

 liiiii acum'mato, niargiue reiitraU ad niujulmn sursmii 

 acclim, ii\fm angnlalo ; latere aiitico anguatato, sul)- 

 rugaio, murgine dorsali area coniplaiiatd iiiipresso, 

 iermiiio acuunitato, snbqnculralo, margiiie ventrali huge 

 siirsum acclivi, tmibonibm magnis, inflatis, sut/aiignlat/s. 



The superb Unio. Shell subglobose, thin, inflated, 

 alatcd, straw-coloured, rayed posteriorly with green 

 bauds, bluish-white within; posterior side inflated, 

 expanded, with a deep augle, dorsal margin elevated, 

 subcompressed, cuneate, lateral margin cuneate, end 

 acuminated at the angle, ventral margin sloped up- 

 wards at the angle, angiilar beneath ; anterior side 

 narrow, rather wrinkled, dorsal margin impressed 

 with a flat area, end acuminate, somewhat square, 

 ventral margin sloped upwards for some length, um- 

 boes large, inflated, subangnlar. 



Lea, Obs. on Unio, vol. iv. p. 32. pi. 42. f. 11. 



/lad. New Holland. 



Shorter, more inflated, and more globose than U. gra- 



iiidnld, mills pallulc J.ilc! iridrscenll ; latere post iro 

 roliiiiJal'im iiiiijiilalo, jirudiiclo, iiiargine dorsali recto, 

 inargiiie laterali obliijiio, teruiino subacumiiiato, mar- 



gme 



u trail vers 



elevalo, medk 



Species 290. (Mus. Taylor.) 



I Nio CoxGAR.EUS. Till, tesld sMrapezoided, coiiiplanatd, 

 hemgatd, fused, obscure radiatd, iiitus cup red ; latere 

 posiico subquadrato, biangulaio, angido antico elevato, 

 margiiie dorsali rectiuscido, termino inter anguloa 

 iruiicato ; latere antico aiigustato, termiiio rotundo, 

 margiiie dorsali depresso, declivi, margiue vent rail recto, 

 niiibonihus lavibus, angulafis. 



The Congakee Unio. Shell subtrapezoidal, flattened, 

 smooth, brown, obscurely rayed, copper-coloured 

 within ; posterior side squarish, biangular, front angle 

 elevated, dorsal margin rather straight, end trun- 

 cated between the angles ; anterior side narrow, end 

 rounded, dorsal margin depressed, sloped, ventral 

 margin straight, uraboes smooth, angular. 



Lea, Obs. on Unio, vol. i. p. 82. 



U. gibber, Lea? Caryferk river, Tennessee. 



Hab. Congaree river, Columbia. 



traclo ; latere antico brevi, aiigitsto, murgine dorsa/i 

 sitbdeclivi, cnneato, wnbuuibiis Imibiis. 



The marginal LT^io. Shell oblong-ovate, thin, very 

 smooth, somewhat inflated, covered with a blackish- 

 brown shining epidermis, pale iridcsceut-fawn within ; 

 posterior side roundly angular, produced, dorsal mar- 

 gin straight, lateral margin oblique, end subaeumi- 

 nated, ventral margin raised towards the end, very 

 slightly contracted in the middle ; anterior side <hort, 

 narrow, dorsal margin sliglitly sloped, enncate, inn- 

 boes smooth. 



Lamarck, Anim. sans vert., Unio, n. -il. 



Eab. Bengal. 



This species is remarkable for the shining smoothness 



of the epidermis. 



Species 297. (Mus. Taylor.) 



Unio jiarginalis. Un. lestd oblongo-ovald, ieuici, la- 

 cissiii/d, ■inbiiijlatd, epiderniide fnsco-nigrescenti nitenli 



Species 298. (Mus. Taylor.) 



Unio DOLABRiEioRJiis. Un. tesld globoso-siditrigond, 

 crassd, injlald, hevigald, olivaced, viridi (postic'e prte- 

 cipiie) radiatd, intiis albd rel rosed ; latere posiico 

 iiijlato, expanse, elevaiim angidato, murgine dorsali 

 elevalo, brevi, margiue laterali obliquo, termino -sab- 

 acnminato, inargine reiitraU ad terminiim elevato, infra 

 snbangulato, medio convexo ; latere antico angitsto, 

 margine donali depresso, breri, cnneato, margiue ren- 

 trali versus ierminum gradatim acclivi, nmboiiibnx 

 maxiinis, rotundis, heribiis. 



The HATCHET-SHAPED Unio. Shell globose-subtrigo- 

 nal, thick, inflated, smooth, olive, r^yed (principally 

 at the back) with green, white or pink within ; pos- 

 terior side iullaled. expanded, with an elevated angle. 



end subaeuminated, ventral margin raised at the 

 end, slightly angular beneath, convex in the middle; 

 anterior side narrow, dorsal margin depressed, short, 

 cuneate, ventral margin gradually rising towards llii- 

 end, umboes very large, rounded, smooth. 

 Lea, Obs. on Unio, vol. ii. p. 103. t. 24. f. 113. 



Unio e.tcavala?, Lea. 

 Kab. Georgia. 



There is a rather close resemblance between this species 

 and Unio ventricosus of Barnes. It is indeed (juite pos- 

 sible they may be the same, although the posterior angle 

 is much stronger in the i'onuer than in latter. 



September, ISC 7. 



