144 PKOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



moderately developed ; habitat chiefly mountain streams, less 

 frequently in lakes and ditclies. 



Type : altitude 11, breadth 5 mm. ; altitude of aperture 6-5, breadth 

 of aperture 3mm. A small specimen: altitude 7, breadth 3 mm. A 

 large specimen: altitude 16, breadth 6mm. 



Coast llange System. 



Santa Cruz Mountains, California : Spring, Wrights (type and small 

 cotype) (H. Hannibal); Adobe Creek, near California Camino Ileal 

 (large cotype) (H. Hannibal, H. M. Edson) ; creek at Congress 

 Springs (H. M. Edson); San Andreas Reservoir (H. Hannibal); 

 Crystal Springs Reservoir (H. Hannibal) ; Matedero Creek, near 

 California Camino Eeal (H. Hannibal, H. M. Edson) ; Lagunita, 

 Stanford University (Dr. J. P. Smith, R. E. Snodgrass, H. Hannibal, 

 H. M. Edson, S. S. Berry Jide Berry MS.) ; San Francisquito Creek, 

 Stanford University (H. Hannibal, H. M. Edson, S. S. Berry fide 

 Berry MS.); San Francisco (W. Wood), Jide Wood & Raymond!; 

 Allanbee Gulch, Portola Valley (H. M. Edson, H. Hannibal); 

 water-trough, Boulder (H. Hannibal) ; Stone Water-trougli Gulch 

 between Boulder and Ben Lomond (H. Hannibal) ; creeks near Santa 

 Cruz (J. G. Coo\)er), fide Cooper. 



Santa Clara Valley: near San Jose (H. Hemphill), ^r/^ Cooper; 

 near Santa Clara (Miss A. E. Laws) ; Cottle-Malavous Slough, 

 Artesian Belt (H. Hannibal). 



Diablo Range : San Miguel Caiion (Miss A. E. Laws) ; Tienan's 

 bog, Hall Valley (H. Hannibal); near Oakland, Jide Tryon. 



Gavilan Range : Bird Caiion at forks, 8 miles west of Hollister 

 (H. Hannibal) ; Tres Pinos Creek, 2 miles south of Tres Pinos 

 (H. Hannibal). 



San Joaquin Valley : irrigating ditches near Fresco (C. E. Jenney) ; 

 slough 8 miles west of Antioch (Miss Ward), Jide Carlton ! 



This little Lij)nn(ea, abundant in the mountain streams of middle 

 Western California, from its inconspicuous size and general similarity 

 to L. ( Galba) ohrussa, a species not known to occur within 200 miles, 

 has commonly masqueraded under one or another of the names applied 

 to that species. On careful inspection it may be distinguished by the 

 compressed nearly shouldered whorls, narrower aperture, and entirely 

 different thin gyrate pillar. Carlton's reference of this species to 

 L. lepida, Gould, is interesting on account of the general similarity 

 of Cooperi to stagnalis at one-fourth scale. The writer takes pleasure 

 in perpetuating the name of the late Dr. J. G. Cooper, who, during 

 the last generation, did more than any other writer to make known 

 the freshwater shells of Western North America. 



Lymn-SIa (Galea) tbuncatula (Miiller). 



Buccinum iruncatulum, Miiller, 1774; Lymneus humilis, Say, 1822; 

 L. tnodicellus, Say, 1825 ; Limncea umbilicata, C. B. Adams, 1840 ; 

 Z. parva, Lea, 1841 ; L. Griffithiana, Lea, 1841 ; X. curta, Lea, 

 1841 ; L. rustica, Lea, 1841 ; L. exigun, Lea, 1841 ; L. IlolhoUi, 

 Beck in Mcirch, 1857; L. {Leptolimnea) Pihbnji, Hemphill, 1890 

 (syntonic form); L. '■ desidiosa, Say', Dall, 1897; L. Stcrkii, 



