U N I . 



Plate VIII. 



Species 2S. (Miis. Cuming.) 

 LImo cypHIUS. Un. testa ohliqui ovatd, aiitice hrevi, 

 postice compressa, suLattmuald, concmtrice rude ni- 

 fjatd, ill medio radialim ol/tuse luberculald, pallide 

 fulco-olivaced. 

 The taulted Unio. Shell obliquely-ovate, autei-iorly 

 short, posteriorly compressed and somewhat altenu- 

 ated, concentrically rudely wrinkled, in the middle 

 radiately obtusely tuberoled ; pale fulvous-olive. 

 K.\FiNES(jUE, Men. Coq. de la riv. Ohio, Ann. Geu. Sc. 

 Phys. Brux. 1820, vol. v. p. 287. 

 Uiiio JEsopus, Green. 

 Hub. North America. 



An oblique, rudely-sculptured shell, generally of a pe- 

 culiar pallid-olive colour. 



Species 29. (Mus. Cuming.) 



Unio brom.as. Un. testa oblique sultpi/rifundi, anlu-i 

 brevissimd, postice curvald, concentrici niijuld, in me- 

 dio radiatim obsolete nodulatd ; fulvo-olivaced, viridi 

 radiatiiii variegatd. 



The duo.medaey Unio. Shell obliquely somewhat pear- 

 shaped, anteriorly very short, posteriorly curved, con- 

 ceutrically -wrinkled, in the middle radiately obso- 

 letely noduled; fulvous-olive, radiately variegated 

 with green. 



Lea, Trans. Amer. Phil. Soc. vol. v. pi. 10, f. 29 ; Obs. 

 vol. 1. p. 182. 



Hub. Tennessee, North America. 



Of a characteristic obliquely-curved growth, the um- 

 boes standing out like two humps. 



Species 30. (Mus. Cuming.) 



Unio striatiis. Uh. testa oblique suborbiciduri, postice 

 rotundato-producld, concenlrice irregidanter nodoso- 

 tuberculatd ; ulivaceo-bnii/ned. 



TuR STRIATED Unio. Shell obliqucly suborbicular, pos- 

 teriorly rotuudately produced, concentrically irregu- 

 larly nodosely tubercled ; olive-brown. 



itric stnaB of growth, and 



cles. 



Species 31. (Mus. Cuming.) 



Unio cicatricosus. Uti. testa elougato-eordatd, aiitice 

 brevissimd, postice valde productd, cunceittrice ruijutd, 

 medio spursini obtuse verrucosa ; fulvo-bruiuied. 



The cicatriced Unio. Shell elongately-cordate, ante- 

 riorly very short, posteriorly very much produced, 

 concentrically wrinkled, in the middle sparingly ob- 

 tusely warted ; fulvous-brown. 



Say. 



Unio varicosus. Lea. 



Ilab. North America. 



The normal form of this species will be found at Phde 

 XII L Fig. -tU. Its extremest variation of growth is re- 

 presented in the characteristic specimen here figured, in 

 which the umboes arc prominently terminal and beaked, 

 and its posterior side very nuieh produced. 



August, 1SG4. 



