182 PROCKEDINGS OF THK MALACOLOGICAL SOCIETr, 



Reeve, 1860 ; S. ShowaUherii, Lea, 1860 ; S. castaneum, Lea, 

 1860 ; S. pumilum, Lea, 1860 ; S. globosum, Lea, 1860 ; S. glam, 

 Lea, 1860. 

 Shell as in olivula. but tlie outer lip sinuate and tei-minating above 

 in a rather broad deep sutural pleurotomariform cleft, body-whorl 

 sub-suturally nodose ; olivula stiv^e passed during adolescence; habitat^ 

 streams. 



Coosa River, Alabama ; American Province. 



GyEOTOMA LiEXA INCISA (Lea). 



Melania {Schizostoma) incisa, Lea, 1842; Schizostoma pagoda, Lea, 

 1845; S. Babglo7iictwi, Lea, 1845; S. fu)iicula(um, Lea, 1845; 

 S. JBuddii, Lea, 1845; S. constrictum, Lea, 1845; Gyrotoma 

 pyramidata, Shuttleworth, 1845 ; <S. Wetumpkaeiise, Lea, 1860 ; 

 S. Alahamense, Lea, 1860 ; S. Ilartmanii, Lea, 1860 ; S. glandula, 

 Lea, 1860; S. virms, Lea, 1860; G. qnadrata, Anthony, 1860 ;;i 

 G. rohusta, Antliony, 1860 ; G. salehrosa, Anthony, 1860 ; ;| 

 G. recta, Anthony, 1860; G. demissa, Anthony, 1860; Melatoma i 

 ornata, 'Anth. MS.,' lleeve, 1860; M. Antlionyi, Reeve, 1860; 

 S. Spillmanii, Lea, 1861 ; S. ShowaUherii, Lea, 1864 (preocc.) ; 

 S. Shoivaltherianum, Tryon, 1873. 

 Shell similar to Iceta, but the outer lip somewhat sinuate and 

 terminating above in a very deep narrow pleurotomariform cleft, 

 whorls sub-nodose below the suture ; Iceta stage passed during 

 adolescence ; habitat streams. 



Coosa River, Alabama ; American Province. 

 Like the preceding a well-marked northern or western race. 

 Unrecognized: Melania {Goniohasis) Furuhjelmi, Mayer, 1869. 

 Miocene (?) of Alaska. 



Family MELANOPSID^, H. & A. Adams, 1854. 



Genus Pachychiltjs, Lea. 



Pachychilus, Lea, 1850 {P. Camingii, Lea); Pachycheilm, H. & A. 

 Adams, 1854 (emended form). 



Type, Pachychilm Cumingii, Lea. 



Three Melanoids from the sub-tropical Eocene and Miocene deposits, 

 evidently allied to one another, but not grouping closely with any of 

 the known genera of Pleuroceridte, may be tentatively placed in this 

 Mexican group. Their true generic position remains to be established. 



Pachychilus Tayloui (Gabb). 



Melania Taylor i, Gabb, 1866; 3Ielania {Goiiioha.iis?) scnlptis, Meek, 

 1870, not of Lea, 1852 ; M. {G.?) subsculptis, Meek, 1870. 



Shell of moderate size, slender-conical, whorls appressed and 

 rather long, sutures somewhat impressed, periphery rounded, aperture 

 elliptical, outer lip slightly sinuate ; habitat apparently lacustrine, 

 at least in part. 



Eocene : Payette Lake beds, Idaho and Oregon ; Truckee Lake 

 beds, Nevada. 



