UNIO.— Plate XXXVI. 



compressS, ienui, intiis cupred, exiiis kevigatd, olivacm, 

 viridi radiatd, latere antico breti, rotundo, medio sub- 

 coarclato, lalere postico laliiiscido, peroblique hiamju- 

 lato, inter anffulos inuicato, tiiaryine dorsali etevnto, 

 Hubalato. 



The coppeu Unio. Shell narrow, elongated, oblique, 

 depressed, thin, copper-coloured within, smooth, olive, 

 radiated with green without, anterior side short, 

 round, middle slightly contracted, posterior side rather 

 broad, very obliquely biangulated, truncated between 

 the angles ; dorsal margin raised, subalate. 



Lea, Unio iv. p. 38. pi. 41. f. 9. 



Ilab. Black Creek, Florida. 



Remarkable for the coppery or bronzed colour of the 



Species 19.5. (Mus. Cumiug.) 

 Unio olivarius. Un. testa ovali,mbdepream, tenuissimd, 

 intiis alba, extus tenuiter striata, pallide viridi, latere 

 antico brevittsculo, rotimdo, latere postico lata, sub- 

 acuminato, margine postico-laterali obliquo, niaryiiie 

 dorsali elevato, brevi. 

 The olive-green Unio. Shell oval, rather depressed, 

 veiy thin, white within, finely striated, pale-green 

 without ; anterior side rather short, round, posterior 

 side broad, rather acuminated, postero- lateral margin 

 sloping, dorsal margin elevated, short. 

 //„/,. ? 



Species 196. (Mus. Cuming.) 

 Unio fabalts. Un. testa snbovali, depressd, solidu, int/is 

 alba, extus lavigala, olivaced, viridi obscure radiatd, 

 latere antico brevissimu, rotundo, medio subcontracto, 

 latere postico attenuato, subacmninato, margine dorsali 

 declivi. 

 The bean Unio. Shell ratin-r oval, depresssed, solid, 

 white within, smooth, olive, obscurely rayed with 

 green without, anterior side veiy short, round, middle 

 rather contracted, posterior side attenuated, rather 

 acuminated, dorsal margin sloping. 



Lea, I'nio i. p. 90. pi. .\. f. 16. 

 Hab. Ohio River; Lea. 



It is more compressed than U. ylaiis, and it is rayed. 



Species 197. {-Mus. Cuming.) 

 Unio CuMBERLANDlCliS. Un. testa ovali, cnmpressd, 

 tenui, intiis catruleo et cameo iridescenti, extus lavi- 

 gala, subaiirautid, viridi radiatd, lalere antico brevi, 

 rotundo, latere postico laliusculo, oblougo, vix angidato, 

 •margine dorsali rectiusculo, margine postico-laterali 

 subexcavato, vmbonibns rugafis. 



The Cumberland Unio. Shell oval, flat, thin, irides- 

 cent with blue and fiesh-colour inside, smooth, 

 orange-coloured and green-rayed outside, anterior 

 side short, round, posterior side rather wide, oblong, 

 hardly angulated, dorsal margin rather straight, pos- 

 terior lateral margin slightly e.si'avntcd. undjoes 

 wrinkled. 



Lea, Unio ii. p. 2.5. pi. vii. f. 19. 



Hab. Cnmherlan.l River. 



Very beautifully covered with green rays on a bright- 

 orange ground. 



Species 198. (Mus. Cuming.) 



I'nio I'UJiiLLS. Un. testa parvd, subquadratd, tumidd, 

 iuhis alba, e.vtus olivaced, latere antico brevi, subde- 

 clivi, aiigusto, latere postico quadralo, subangulato, 

 marginibus dorsali et ventrali rectis, umbonum regione 

 nndatim rugatd. 



The dwarf Unio. Shell small, rather square, tumid, 

 white inside, olive without, anterior side short, rather 

 sloping, narrow, posterior siile square, rather angular, 

 dorsal and ventral margins straight, region of the 

 umboes wavily wrinkled. 



Lea, Unio ii. ]). 23. pi. vii. f 17. 



Hab. Black River. North Carolina. 



A VI 



lare shell. 



