CRETACEOUS FOSSILS. 131 



tracted in advance. Outer lip acute, sinuous; inner lip thinly 

 incrusted. Canal gently curved. 



Length, .75 inch; width of body whorl, .25 inch. 



Locality: Common at Pence's Eanch, twelve miles north of Oroville, Butto 

 County. (Div. A.) 



LITTORINA, Ferussac. 

 ? L. compacta, n. s. 



PI. 20, Pig. 89. 



Shell small, subglobose, thick; spire moderately high; whorls 

 five, convex; suture minutely impressed. Surface marked by 

 numerous, fine, rounded, revolving ribs, crossed occasionally by 

 minute, oblique lines of growth. Sometimes these latter lines are 

 entirely absent; but they can usually be detected where the sur- 

 face is in the least weathered. Mouth nearly circular ; outer 

 lip acute on the margin, rapidly thickening behind; inner lip 

 thickened, bordered externally by a ridge, a continuation of the 

 outer edge of the mouth; slightly excavated inside of this ridge. 



Height, .35 inch; width of body whorl, .3 inch. 



Locality: Texas Plat, Placer County; not rare. I have not observed this shell 

 at any other locality. 



TURRITELLA, Lam. 



T. IXFRALINEATA, 11. S. 

 PI. 20, Fig. 87. 



Shell elongated; whorls increasing vevy gradually in size, 

 sides nearly parallel, convexly excavated below; suture im- 

 pressed, placed at the base of an angular channel. Surface 

 marked by three principal square ribs, one placed at the upper 

 angle of the whorl, one at the lower angle, and the third nearest 

 the Lower one; between the third and the upper one are two 

 smaller ribs, the lower of which is largest, the upper being 



