CRETACEOUS FOSSILS. 101 



by a few indistinct, oblique, revolving lines. Upper part of colu- 

 mella and aperture unknown; lower portion of the columella 

 tortuous. 



Figure, natural size. The outline is in part restored from another fragment. 

 The species is founded on the fragment figured, and another, still more imperfect, 

 of the body and preceding volution. I describe it here, because it is one of the 

 few species found in the strata immediately below the coal in the Mount Diablo 

 district, and may be important in identifying the same beds elsewhere. It is 

 associated with several species found also at San Diego and Martinez (Bull's Head 

 Point), in Division B. From a hill, southeast of "Mine Hill," near Clayton, 

 from a formation below the coal-bearing strata. 



F. SINUATA, 11. S. 

 PI. 28, Fig. 213 a. 



Shell robust, fusiform; spire high, whorls six to six and a 

 half, rounded ; suture linear, impressed. Mouth rounded on the 

 sides, acute above, narrowed below. Columellar lip very slightly 

 incrusted ; canal curved. Surface marked by about eight sinuous 

 ribs on each volution, most prominent on the angle. These are 

 crossed by numerous revolving, elevated lines, usually alternating 

 very regularly in size. 



Figures, natural size and magnified. 



Localities: Alizos Creek, near Fort Tejon; and San Diego (in Division B.). 



? F. Io, n. s. 



PI. 28, Fig. 214. 



Shell turreted, spire high, whorls seven and a half, angulated, 

 flat or slightly concave above, and nearly straight below; marked 

 on the angle by a series of prominent, flattened tubercles. Mouth 

 biangular above, rapidly narrowing in advance ; outer lip simple ; 

 inner lip very faintly incrusted ; columella abruptly bent in ad- 

 vance; extremity of the canal unknown. Surface marked by 

 numerous revolving lines, crossed by lines of growth. 



Figure, natural size. 



Locality: A single-specimen found by Dr. Geo. H. Horn, near Fort Tejon. 



