UN 10 



Species 5. (Miis. Cuming.) 



Unio PLiCATUS. Un. tedii subquadrato-ovatii, postice 

 coMjire«sii et decUvi-truncatd, umhomhus-prominentibiis, 

 amjj/is, tumidis, oblique perainpUter pUcatis, pUcis si- 

 Huosis, prope ad marginem vmtralem ohliqui desceii- 

 dentibus ; epidermide fidvo-yiiyrd. 



The plaited Ukio. Sliell somewhat squarely orate, 

 posteriorly compressed, and slopingly truncated, um- 

 boes prominent, large, swollen, obliquely very largely 

 plaited, plaits sinuous, descending obliquely nearly to 

 the ventral margin ; epidermis fulvous-black. 



Say, Amer. Conch, pi. 1. f. 8. 

 Unio Peruviana, Lamarck. 

 Unio rariplicata, Lamarck. 

 Unio Bomhei/ana, Valenciennes. 



Hab. North America. 



Cliaracterized by the swollen proniinence of the uraboes, 



and iMldness uf the oblique sinuous plaits. 



Species 6. (ilus. Cuming.) 

 Ukio Kleinianus. Un. teddobtusi; trigond, conipressius- 

 cidd, postice declivi-truncatd, nndique nitide divarica- 

 liin liralo-plicatu, plicis parvis, nuinerosis, inteniitiis 

 concentrice tenninidcatis et siriatis ; epidi-rmide fidoo- 

 olivaced. 

 Klein's Unio. Shell obtusely triangular, rather com- 

 pressed, posteriorly slopingly truncated, neatly diva- 

 ricately ridge-plaited throughout, plaits small, nu- 

 merous, interstices concentrically finely grooved and 

 striated ; epidermis fulvous-olive. 

 Lea, Trans. Amer. Phil. Soc. Second Series, vol. 10. pi. 



17. f. 18; Obs. vol. 5. p. 21. 

 Hab. Suwanee River, Florida, North America. 



When Mr. Lea, in 1852, described this pretty species, 

 he remarked that the beaks of the only two specimens 

 then known to him were much eroded, and that he should 

 suppose " that, in perfect or young specimens the folds 

 would extend to the apex, and present a fine appearance." 

 Mr. Cuming's specimen, here figured, has much of the 

 character Mr. Lea anticipated. 



Species 7. (Mus. Cuming.) 

 Uxio c.elatus. Un. ((fstd lati sccurifornii, comipresm, 

 medio concavo-contradd, l/vvigaid, versus margines 

 posticum et ventralem radiatim verrucoso-rugatd ; epi- 

 dermide nigricante-viridi, Inteo linctd el variegald. 

 The carved Unio. Shell broadly wedge-shaped, com- 

 pressed, concavcly contracted in the middle, smooth, 

 radiately wart-wrinkled towards the posterior and 

 ventral margins ; epidermis dark green, stained ami 

 variegated with yellow. 

 CoNKAD, Frcshw. Shells, p. 29. f. 3, -1. 

 Hab. North America. 



A prettily-coloured wedge-shaped shell, compressly 

 contracted in the middle, smooth throughout, except at 

 the posterior and ventral margins, where sculpture is de- 

 veloped in strong wart-wrinkles. 



Species 8. (Mus. Cuming.) 



Unio ueros. Un. testa subquadrato-ovatd, postice late 

 expansd, snbflabelliformi, circa nmbones crispato-verru- 

 cosd, deinde oblique perampliter pUcatu, plicis siuuosis, 

 superioribns minoribns, versus marginem dorsalem ra- 

 diantibus ; epidermide fusco-nigrd. 



The hero Unio. Shell somewhat squarely ovate, pos- 

 teriorly broadly expanded, rather fan-shaped, crisply 

 verrucose around the uraboes, then obliquely very 

 largely plaited, plaits sinuous, upper smaller, radia- 

 ting towards the dorsal margin ; epidermis fuscous- 

 bla'ck. 



Say, ' Disseminator,' Lea, Syuops. p. 20. 

 Unio mnltiplical/is, Lea. 



Hab. North America. 



]\Ir. Lea claims the adoption of his name of U. midti- 

 pticatus for this species on the grounds that Mr. Say, after 

 having described it in the ' Disseminator ' with the name 

 of U. lieros, abandoned the species in his ' American Con- 

 chology ' as being a variety of U. undulatus. If Mr. Lea 

 considered Mr. Say's original view to be the right one, he 

 should have reinstated the original name. 



AuL'ust, 18C4. 



