UNIO. -Plate LXVIII. 



nnf/iilij-f Iruncato, nreii (UKjulari clfvidd, mi'd'ui ohliqui 

 dcjjressu, margiae veidrali. contracto ; lalen aiiliru 

 hrevi, aiigusto, declivi, umbonibus lavigatis, tiiinidis. 



Downe's Unio. Shell thick, tumid, narrow, subrhoin- 

 boidal, chestiiut-colom-ed, smooth, salmon - tinted 

 within, teeth large, jagged ; posterior side biangular, 

 truncated between the angles, angular area elevated, 

 middle obliquely depressed, ventral margin con- 

 tracted ; anterior side short, narrow, sloped, nmboes 

 smooth, tumid. 



Lea, Obs. on Unio, vol. ii. p. 29. pi. 9. f. ii. 



Hal). Hopetown, Georgia. 



.V reuiarkablv thick, solid, subcvlindrieal shell. 



U.NIO REGULAKls. I'll, ti'stii ti'Hiii, injlalii, ovatd, obficure 

 fused, coiiceiilrici' KKhnnjDm, intus ctipreo-subviridi ; 

 latere postico lata, miinjini- dorauli couve.ro, elevato, 

 terniino siibuciimiiialo, iiiargiiie veidrali rotuiido, medio 

 subcoiitraclo, uiubonibm liroibus, antici decUvis ; latere 

 uiitico anijiatalo, leruiwo rotimdo. 



The regular Unio. Shell thin, inflated, ovate, dull 

 brosvn, conceiitricallv' subrugose, greenish copper- 

 coloured within ; posterior side wide, dorsal margin 

 convex, elevated, end subacumiiiated, ventral margin 

 round, middle slightly contracted, nmboes smooth, 

 sloped in front; anterior side narrow, end rounded. 



Lea, Obs. on Unio, vol. iii. p. 81. pi. 2.5. f. 59. 



n,ib. French Broad liiver, Kast Teimc-:ee. 



