92 PALAEONTOLOGY OF CALIFORNIA. 



P. Blakei. 



PI. 21, Fig. 110. 

 (Bum/con ? Blakei, Con. Pacific Pv. R. Report, vol. 5, p. 322, PI. 2, Fig. 13.) 



Shell elongate ; spire moderately elevated ; whorls six to six 

 and a half, angular; suture small, faintly channelled. Body whorl 

 ornamented by two prominent, nodose carinre, with a concave 

 surface between them ; the upper one only visible on the upper 

 whorls ; upper surface of the whorls inclined, plain or gently 

 concave ; surface marked by faint revolving lines. On one speci- 

 men there is a distinct, non-tuberculate rib between the two con- 

 stant ones, and a faint angulation below the lower one. 



Aperture elongated, broad above; below, rapidly narrowing 

 into the, long, slender canal. The aperture and canal are more 

 than two and a half times as long as the height of the spire, 

 measured from the posterior angle of the mouth. Canal slender, 

 very slightly curved. 



Figure, natural size. 



Localities: From Division B., near MartiSez, where the only perfect specimen 

 has been found. I have found it abundantly near the coal-mines at Clayton, in 

 the same strata at Cochran's, east of Mount Diablo, and near the Canada de las 

 Uvas, Los Angeles County, where it is abundant. 



TURRIS, Bolt., 1798. 

 Plcurotoma, Lam., 1799. 

 T. Claytonensis, n. s. 



PL 18, Fig. 4G. 



Elongated, fusiform; spire slender, high. Aperture narrow, 

 straight, widest posteriorly, about as long as the spire. Sinus 

 deep, narrow, rounded, commencing a little below the suture, 

 and situated entirely above the nodose angle of the whorl; outer 

 lip acute, rounded, most prominent about half-way between the 



