HANNIBAL: CALIFOKNIAN FEESHWATER MOLLUSCA. 171 



M. regularis. Lea, 1841; If. exarata, Lea, 1841 (preocc.) ; 

 J/J«r^/^rt, Lea, 1841; 7l/.r/r«i'rt, Lea, 1841 ; M. product a, 'Liia.,\^A2; 

 II. Foremanii, Lea, 1842 ; II. mrvatiim, Lea, 1842 ; M. torquata. 

 Lea, 1842; M. Ordiatia, Lea, 1842; M. torta, Lea, 1842; 

 M. fikm, Lea, 1845 ; II. peniodosa, Lea, 1845 ; II. Brumhyi, 

 Lea, 1852 ; M.gradata, Aiitliony, 1854 ; M.planogyrum, Anthony, 

 1854; II. eximia, Anthony, 1854; M. glans, Antliony, 1854 

 (preocc); II- incrassa, Anthony, 1854; M. fastigiata, Antliony, 

 1854; M. oj)aca, Anthony, 1860; II. po7iderosa, Anthony, 1860; 

 M. grossa, Anthony, 1860; If. mfra/asciata, Anthony, 1860; 

 If. glandula, Anthony, 1860 ; If. iostoma, Anthony, 1860 ; 

 If. nigrostoma, 'Anth. MS.,' Eeeve, 1860; II. rorata, Reeve, 

 1860 ; lo gracilis, Lea, 1861 ; /. rohista, Lea, 1861 ; /. viridula, 

 Lea, 1861; Tryphmiosloma dux, Lea, 1862; T. Troodii, Lea, 

 1862; T.viride, Lea, 1862; T. ligatum, Lea, 1862; T. Shoival- 

 therii, Lea, 1862; T. Thornton'ii, Lea, 1862; T. trivittatim. 

 Lea, 1862; T. PosteUii, Lea, 1862; T. inciirvmn. Lea, 1862; 

 T.AlfibainenscLea, 1862; T.Florencense,'Leii, 1862; T. olivaceum, 

 Lea, 1862; T. simplex, Lea, 1862; T. canalitium, Lea, 1862; 

 T. Clarkii, Lea, 1862; T. Anthony i. Lea, 1862; T. mori forme, 

 Lea, 1862; T. Pylasii, Lea, 1862; T. Jayi, Lea, 1862; 

 T. Hartmanii, Lea, 1862; T. bivittattim, Lea, 1862; T. Spill- 

 manii, Lea, 1862; T. tortum, Lea, 1862 ; I'. Tennessee' nse, 

 Lea, 1862; T. minor, Lea, 1862; T. dignum. Lea, 1862; 

 T. moniliferuyn. Lea, 1862 ; T. trochnlus. Lea, 1862 ; T. pumiliwn, 

 Lea, 1862; T. Christy i, Lea, 1862; T. Tuomeyi, Lea, 1862; 

 T. labiatum, Lea. 1862; T. Zewisii, Lea, 1862; T. curtatum. 

 Lea, 1863; P. plicatiim, Trjou, 1863; T. Roanense, Lea, 1864; 

 T. Lesley i. Lea, 1864 ; T. wiivittatum. Lea. 1864 ; T. subrobtisttim, 

 Lea, 1864; T. cinctmn. Lea, 1864; T. cylindraceum. Lea, 1864; 

 T. napoideum, Lea, 1864 ; T. affine. Lea, 1864 ; P. Leaii, Tryon, 

 1873; P. Parlcerii, Tryon, 1873. 

 Shell large, rather broadly conical, whorls closely appressed, sutures 

 not impressed, periphery sub-rounded or angular, aperture elliptical 

 anil more or less produced below, the outer lip sinuate and cliannelled 

 at base ; habitat chiefly streams. 



Oliio, Tennessee, and Alabama Eiver Systems, American Province. 



PlEUROCERA FLUVIATILIS AUMIGEEA (Say). 



Ifclania armigera. Say, 1821 ; If. stygia. Say, 1829; If. tuberculata, 

 Lea, 1830 (preocc); If. Duttoniana, Lea, 1841; If. Jayana, 

 Lea, 1841; If. Spixiana, Lea, 1848; If. robulina, Anthony, 

 1850; lo rota, Reeve, 1860; Z. fasciolata, Reeve, 1860; 

 If. nodata. Reeve, 1860; Angitrema Wheatleyi, Tryon, 1866. 

 Shell of moderate size, broadly conical, Avh oris appressed, peripherj'- 



subangular and more or less nodose on body-whorl, apertnre elliptical 



and slightly produced below, outer lip barely sinuate and channelled 



at base ; habitat streams. 

 Cumberland, Wabash, and lower Tennessee Rivers, Alabama, American 



Province. 



