201 



intus iutense purpurca, marginc posteriori iridesccnte, — 

 Th. M. 



Mensura desideratur. 



Simills u, alato Say et u. lugubri Say (= atro Lea). 

 Margo cardinalis leviler arcuatus; lunbones applanali; dcn- 

 les cardinales oblirpie retrovcrsi, crassi, sulcati, dentes la- 

 terales breves, granulati, a cardinalibus valde remoli. 



Legit Conrad satis frequcntem in Black Warrior ilu- 

 mine Alabamae borealis, 



Conrad, new fresh water sliells. p. 25. ct tab. L 



10. U II i o t a e n i a t u s T. •^. Conrad. 



Un. testa elliptica, convexa, crassiuscula, infra arcuata; 

 umbonibus rotundatis, apice prominulis; pube linca imprcssa 

 notata; epidcrmide tenuiter rugosa, olivacea, radiis regula- 

 ribus viridibus interruptis ornata; intus caerulescenti - alba, — 

 Th. M. 



Mensura desideratur. 



Affinis u. fasciolari Rafin., scd brevior magisque elli- 

 pticus et convexus. similis et u. fasciato Rafiu. Dentes car- 

 dinales et latei-ales prominentes. 



Hab. in Flint flumine comitatus Morgan in Alabama. 



Conrad, new frcsh water shells. p. 26. et tob. IV. fig. 2. 



11. Unio trabalis T. Jl. Conrad. 



Un. testa anguste elliptica, subrostrata, auterius crassa, 

 postice attcnuata, obtusc rotundata; margine posteriori recto, 

 oblique desccndcntc; umbonibus latis, prominentibus, apice 

 erosis; epidcrmide profunde olivaceo-brunnea, radiata; in- 

 tus alba, postcrius iridesccnte. — Th. M. 



Mensura desideratur. 



Similis u. nasuto Say, sed dilTert umbonibus magis pro- 

 minentibus ct rostro cum basi fcre rcctilinco. Forsan si- 

 milis quoquc u, subrostrato Say (qucm auctor non vidit), 

 a quo testa antice crassiori difl^ert. — Icon ab aucfore 

 picta formam regularitcr ovatam exhibet! 



Patria desideratur. 



Comad, uew hcsh waler shells. p. 27. el iab. III. fig. 5. 



