u 



LAND AND FRESH- WATER SHELLS OF N. A. [PART II, 



Fig. 119. 



Pompholyx 



effu/ta, 



enlarged. 



PomiJlaolyx effiisa, Lea, — Shell small, striate, 

 roundly gibbous, rather thiu, effuse, reddish koru-colored ; 

 whirls five, flattened above, convex below ; aperture sub- 

 rotund, dilated, within white, spotted. , 



Sacramento River ; Dr, Trask, (Lea.) 



Pompholyx effnsa, Lea, Proc. Phila, Acad. VIII, 80 (1856) ; 

 Jour, de Conch. 2d series, II, 208 (trans.), 1857. — 

 H. & A. Adams, Gen. Rec. Moll. pi. cxxxviii, f. 11. 



Fig. 119 is drawn from Mr, Lea's type. 



CARIXIFEX. 



Tentacles — ? Mantle — ? Foot — ? 



Shell dextral, spiral, inflated, angular, horn-colored ; spire ter- 

 raced, whirls numerous, angular, visible above, last whirl very 

 large, broad above, very rapidly attenuated below ; umbilicus 

 funnel-shaped ; aperture triangular, broad above, narrow below ; 

 inner lip slightly thickened ; outer lip thiu, acute, angular above, 

 flexuose. 



Jaw — ? Lingual membrane — ? 



The general appearance of the shells for which the generic 

 name of Carinifex is proposed would place them 

 among the Limnseidee. Nothing is known of the 

 generic characteristics. The base of the shell re- 

 sembles somewhat Taphius, but that subgenus has 

 the upper surface of Planorbis, flattened, spire 

 sunken, whirls rounded. 



Carinifex iie\%'l>erryi, Lea.— Shell light hom- 

 colored, depressed, turreted, very minutely striated, above 

 and below acutely carinated, broadly and deeply umbili- 

 cated, whirls five, fiat ; aperture large, light horn-colored, 

 subtriangular. 



Klamath Lake and Canoe Creek, California : Dr. J. S. 

 Newberry. {Lea.) 



