208 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Cooper, J. G. " On some Pliocene Freshwater Fossils of California " : Proc. 



Calif. Acad. Sci., ser. il, iv, pp. 164-72, pi. xiv. 1894. 

 Stearns, R. E. C. "The Fossil Freshwater Shells of the Colorado Desert, 



their distribution, environment, and variation": Proc. U.S. Nat. Mus., • 



xxiv, No. 1256, pp. 271-99, pis. xix-xxiv, 1902. 



New Groups ]'ROPosed in this Paper. 



Those preceded by a t are proposed on fossil forms. 



Unionoii>ej<;. 



Qiiadrulidae, sub-fuuiilj- Pleurobemiuse, u.siib-fanj. 



Lanipsilidae, sub-family Propteriuge, ii.sub-fani. 



Ificjranaja, ii.gen. {Unio littoralis, Lam.). 



Arnoldina, n.gen. {Anodo7ita dejecta, Lewis), 

 \G(iiiidea, sub-gen. Livmohasilissa, n. sub-gen. {MargavHana suhangn- 



lafu, J. G. Cooper). 

 ]- .lliirf/(in'f(ina {Psendnnio) Ilerrei, sp. nov. 

 ]Uiiio frtn/spaci/ica, Arnold & Hannibal, n.sp. 

 ] Gonidca HempJtiUi, n.sp. 



Cyrenoide.?':. 



Coi'neocj'cladidae, ii.n. (Pisidiadse, Grav, not available). 

 ■\Sph(eriuin (Aniesoda) Hoqefsi, n.sp. 

 f/S. {Amesoda) Atidenonii-vniim, n.sp. 

 f 5. (Amesoda) CatherhKB, n.sp. 

 \ Corneocyclas {Pisidimn) Meehi, u.sp. 



C. Tremperi, n.sp. 



LvMNOIDE^. 



Lymnteidiie, sub-family Acellinae, ii.sub-fam. 

 Ancylidae, sub-family Laevapecinse, ii.sub-fam. 

 Ancylidoe, sub-family Latiiiife, n.sub-t'am. 

 Aucylidfe, sub-family Neoplauorbinae, n.sub-fam. 

 Fisherola laucides, n.gen. et n.sp. 

 \Zal()phancylus Morani, n.gen. et n.sp. 

 Lanx, sub-gen. WaJheroIa, n. sub-gen. (Z. ( WaReroIa) Klamatlienain, 



n.sp.). 

 Giuidlnchia, sub-gen. Kincaidilht, n. sub-gen. [Ancylus fragtits. 

 Tryon). 

 ] Helisoma, sub-gen. PerriniUa, n.sub-gon. (ZT. [PcrriniUa) Cordil- 



lerana, n.sp.). 

 \ Planorbis {Segme?itina) Mojavensis, n.sp. 

 Lymncea Cooper i, n.sp. 



MELANOir)E,?<:. 



Ellipstomidae, n.fam. 



Pleuroceridce, sub-family Gyrotominse. n.sub-fam. 

 \ Amhloxns Olequaensis, Arnold &: Hannibal, n.sp. 

 ] Pacliychilns Lawsoni, n.sp. 

 f /*. Brakei, Arnold »fc Hannibal, n.sp. 



lllSSOIDE.T^. 



Pulimidae, n.n. (Bytliiniidse, Tryon, not available). 

 ] Bra7inerillus physispiniH, n.gen. et n.sp. 



