UN 10. 



Plate VI. 



Species 21. (Mus. Cuming.) 



Unio Foesheyi. Un. testa mibquadmto-orliadari, pos- 

 tice subobscnre liangidatd, deinde conipresse jiroditdd, 

 iindiqiie copiose nodoso-tuberculatd ; fidvo-ollvaceCi. 



Fokshey's Unio. Shell somewhat squarely orbicu- 

 lar, posteriorly rather obscurely two-angled, then 

 compressly produced, copiously nodosely tubcrckJ 

 throughout ; fulvous-olive. 



Le.\, Journ. Acad. Nat. Sci. Philad. Second Series, vol. iv. 

 pi. 60. f. 182 ; Obs. vol. viii. p. 39. 



Hob. Texas and Alabama, North America. 



An extremely pretty species, doubly angled and flexu- 



ously compressed on the posterior surface, and studded 



throughout with neat, nodose tubercles. 



Species 22. (Mus. Cuming.) 



Unio FLEXUOSUs. Un. testa ovatd vd quadrato-ovatd, 

 Iceviuscidd, medio et postice late rude cosiatd, costis ad 

 extremitates iuterdum prodiwtis et lobatis ; fuho-oU- 

 vaced vel brumied, virldi interdum rudiatim liueatd. 



The flexuous Unio. Shell ovate or squarely-ovate, 

 rather smooth, broadly rudely ribbed in the middle 

 and posteriorly, ribs sometimes lobed at the extre- 

 mities, sometimes produced aud lobed ; fulvous-olive 

 or brown, sometimes radiately liueated with green. 



Rafinesque, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. 

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

 Unio foliatits, Hildreth. 



Hab. North America. 



The more flexuous form of tliis species is the curious 



lobed variety of which we give a representation at Plate 



XIII. Fig. 53. According to recent observations it is 



said to be the male of the species, the form here figured 



beins; the female. 



Species 23. (Mus. Cuming.) 



Unio REFLEXUS. Un. testa subtriyono-ovatd, postice ob- 

 scure flexiioso-aiigidatd, taviusculd, medio radiatim tu- 

 berciiliilii, Inherciilis distantibus, compressis, quasi cor- 

 nulix, (iri'ii liijinui'iiH rufjaid ; fulvo-oUvaced. 



The EEi'Li.rcED I'mo. Shell somewhat triangularly 

 ovate, posteriorly obscurely flexuously angled, rather 

 smooth, radiately tubercled in the middle, tubercles 

 distant, compressed, as if horned, ligamentary area 

 wrinkled ; fulvous-olive. 



Rafinesque, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc. 

 Phys. Brux. 1830, vol. v. p. 287. 

 Unio cornutus, Barnes. 



Hub. North America. 



The tubercles have a peculiar pinched growth, the inter- 

 stices between them being hollowed. 



Species 2-t. (Mus. Cuming.) 

 Unio quadratus. Un. testa suborbiculari-ovatd, }iostice 

 obscure biangulatd et compresse Jlexuosd, radiatim ver- 

 rucoso-tuberculatd, (ubercidis promiscui.s, hie illic dis- 

 tantibns ; riri'sn'iilt'-iiHrnccd. 

 The saUARE Imo. Shrll somewhat orbicularly ovate, 

 posteriorly ob>cunl\ biaiigled and compressly Hexu 

 ous, radiately verrueosely tubercled, tubercles promis- 

 cuous, here and there distant ; greenish-olive. 

 Rafinesque, Mon. Coq. de la riv. Ohio, Ann. Gen. Sc 

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

 Unio quadrulus, Say. 

 Unio asperrimus, Lea. 

 Rab. Ohio river. North America. 



A tine, posteriorly flexuous species, in which the radia- 

 ting warts are curiously promiscuous in their development 



August, ISG-t. 



