UN 10. 



Plate XII. 



Species 43. (Mus. Cuming.) 

 Unio bullatus. Tin. testa subcordato-orbiculari, postice 

 quadrato-truncatd, promiscue (iniildo-verrticosd, ver- 

 rucis ad latus podkuvi plicato-radiantibus ; oUvaceo- 



The bubbled Unio. Shell somewhat cordately orbieu- 

 lar, posteriorly squarely truncated, promiscuously 

 tumidly warted, warts plicately radiating on the 

 posterior side ; olive brown. 



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

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

 Unio jmstulosiis. Lea. 



JIab. North America. 



A subrotund shell, rather prominent at the umboes, 



s(|uarely truncated on the posterior side. 



Species 44. (]\Ius. Cnuiing.) 



Unio irroeatus. Uti. testa subtrigouo-corduld, postice 

 arciiato-declivi, concentrice varicoso-lii-atd, liris mo- 

 dice nodulatis ; lutescente-olivaced, punctis viridibits 

 copiosH radiald. 



'I'he bedewed Unio. Shell somewhat triangularly cor- 

 date posteriorly arcuately sloping, concentrically va- 

 ricosely ridged, ridges moderately noduled ; yellow- 

 ish-olive, copiously rayed with green dots. 



Lea, Trans. Amer. Phil. Soc. 1827 ; Obs. vol. i. p. 11. 

 pi. 5. f. 5. 



llnb. North America. 



It appears to be a character in this species that the 

 radiatmg bands of green are composed of numerous 

 small dots. 



Species 45. (Mus. Cuming.) 



Unio stegarius. Uti. testa suborbicidari, depressiuscidd, 

 medio modice concavo-jlexuosu, postice. snbtnoicatd, 

 concentrice rnriroso-Hn/tii. prnfini^ irretpitariter ver- 

 rucosa ; liifesreiite-olivdci'd, piinvtif: ririilib/is rupiosi' 

 radiatd. 



The bedecked Unio. Shell nearly orbicular, rather 

 depressed, moderately concavely flexuous in tin mid- 

 dle, posteriorly slightly truncated, concentrically \a- 

 ricosely ridged, profusely irregularly wartcd ; ydluw- 

 ish-olive, copiously rayed with green dots. 



Eafinesque, Mou. Coq. de la riv. Ohio, Ann. Gen. Sc. 

 Phys. Brux. 1S20, vol. v. p. 287. 



Hab. North America. 



Very like the preceding species in details of character. 



but of quite a ditt'erent form. 



Species 46. (Mus. Cuming.) 



Unio PERNODO-SUS. Z7«. trxlil suhipiadrdio-omld, ^ 

 declivi-expansd, deiiide triincutd, tnmido-veri 

 verrucis ad aream poslicaiii plicnlo-riiJiinilibn. 

 tescente-oVu-nced. 



The mucu-knotted Unio. Shell somcuhat s(| 

 ovate, posteriorly slopingly expanded, then 

 cated, tumidly warted, warts plicately radiali 

 the posterior area ; yellowish-olive. 



Lea, Trans. Amer. Phil. Soc, Second Series, vol. \. 

 Obs. vol. iv. p. 45. pi. .3. f. 8. 



Hab. North Carolina, North xUncrica. 



The posterior side ha- 

 form, and its area is espei 

 ranging in radiating folds 



•r qu 



August, 1864. 



