UN 10 



Species 75. (ilus. Cumiiig.) 



Unio lenior. Uii. testa ohlongo-ocatd, temdculd, antic!; 

 attenuato-rotundatd, posfice lata prodiicld, gibbosius- 

 ciild, ad extremitatem Jlexuoso-siibpartitd, prope mar- 

 giiwm linean-sulcatd ; fulvescente-olivaced. 



The smoother Unio. Shell oblong-ovate, rather thin, 

 anteriorly attenuately rounded, posteriorly broadly 

 produced, rather gibbous, flcxuously subpartite at 

 the extremity, linearly grooved near the margin ; ful- 

 vous-olive. 



Le.\, Trans. Anier. Phil. Soc. 184.0. Obs. p. 42. pi. 15. 

 f. IS. 



ILih. Tennessee, North America. 



A delicate, small species, having somewhat the appear- 

 ance of a Modiola. 



Species 76. (Mus. Cuming.) 

 Unio H.\nley.\nus. Un. testa obloiigo-cuneiforini, cras- 



siusculd, versus umbones gibbosd, utriiKiue rotinuhild, 



latere postico oblique decUvi, vix angulato ; fulw-oU- 



raced,fusco coiicentrice remote fasciatd. 

 H.inley's Unio. Shell oblong wedge-shaped, rather 



thick, gibbous towards the umboes, rounded at each 



end, posterior side obliquely sloping, scarcely angled ; 



fulvous-olive, concentrically distantly banded with 



brown. 

 Le.\, Trans. Amer. Phil. Soc. Second Series, vol. x. ; Obs. 



vol. V. p. 35. pi. 33. f. 37. 

 Jlab. Georgia, North America. 



Of a gibbous, oblong-ovate form, although partaking of 

 the character of the wedge-shaped species of the preceding 

 Plate. 



Species 77. (-Mus. Cuming.) 



Unio medius. Uu. testa oblhiue cniieifurmi, uiitice valde 

 (/ibbusd, postice attenuato-compressd, obscure Jlexuoso- 

 aiii/ulatd; fulvo-olivaced, fasco coiicentrice remote fas- 

 ciatd. 



The middle Unio. Shell obliquely wedge-shaped, an- 

 teriorly very gibbous, posteriorly attenuately com- 



pressed, obscurely flexuously arigled ; fulvous-oli' 

 concentrically distantly banded with brown. 



Lea, Pro. Acad. Nat. Sci. Phil. IS'il. p. 40 ; Ob., vol. \ 

 p. 82.pl. 10. f. 227. 



llab. Alabama, North America. 



Particularly swollen and gibbous towards the umboes 



Species 7S. ("Mus. Cuming.) 



Unii) suBROSTR.iTUS. Uii. testd elomjatu-ovatd, cotiipns- 

 siusculd, utrinque rotunduld, postice subattenuatd, la- 

 viijald, obscure concentrice riigatd; lutescetite-oUiiaced. 

 riridi nndique intemipts radiatd. 

 The slightly-beaked Unio. Shell elongately-ovate, 

 rather compressed, rounded at each end, posteriorly 

 rather attenuated, sraootli, obscurely concentrically 

 wrinkled ; yellowish-olive, interruptedly rayed through- 

 out with green. 

 S.iY, Anthony, IMS. in Mus. Cuming. 

 Hub. North America. 



There is a marked regularity about the interruptedly- 

 rayed painting of this species. 



Species 79. (Fig. «, male ; Fig. b, female ; Mus. Cuming.) 

 Unio Caps.'eeoumis. Vn. testd ovatd, tenuiculd, autice 

 attenuato-rotundatd, postice interdnm decUvi-angulald, 

 interdum late compresse expansd ; virescente-olivaced, 

 intense viridi eopiose Uneari-radiatd el tinctd. 

 The CaI'sa-shaped Unio. Shell ovate, rather thin, 

 anteriorly attenuately rounded, posteriorly sometimes 

 slopingly angled, sometimes broadly eompressly ex- 

 panded; greenish-olive, copiously linearly rayed and 

 stained with dark-green. 

 Lea, Trans. Amer. Phil. Soc. ls:jl ; Obs. vol. i. p. I4:i. 



pi. 2. f. 4. 

 llab. Cumberlau.l liiver, North America. 



The two specimens here figured are giviMi, on the au- 

 thority of Mr. Anthony, as the n.ale and female of the 

 same species. 



Novemljcr, 1SC4. 



