6 PALAEONTOLOGY OF CALIFORNIA. 



lip acute; sinus very broad and shallow; canal moderate, slightly 

 twisted. 



Figure, natural size. 



Locality: From the Post-Pliocene, Santa Barbara. 



This beautiful species is also found living on the coast of California, a beach 

 specimen having been found at San Diego, and another dead specimen was 

 dredged by Dr. Cooper, at a depth of 120 fathoms, in the same vicinity. The 

 colors, when living, are a brownish-orange, with broken revolving bands of a 

 light reddish-brown ; these bands usually occur on the larger ribs, and are most 

 closely placed on the middle of the shell. 



In my description, above quoted, I inadvertently mentioned two fossil speci 

 mens. Only one has yet been found, but that is the most perfect specimen yet 

 known of the species, except in color. 



P. (S.) TRYONIANA, n. s. 



PI. 1, Fig. 9, and 9 a. 



SHELL large, fusiform; spire about as long as the mouth; 

 whorls about seven or eight, angulated in the middle, sloping 

 concavely above, and very slightly convex below. Surface orna 

 mented by a row of nodes on the angle of the whorl, and by 

 numerous fine revolving ribs. Aperture narrow; inner lip 

 slightly sinuous and incrusted; posterior sinus of outer lip 

 broad and shallow ; canal moderate, nearly straight. 



Figures, natural size. 



Locality: From the Post-Pliocene of Sail Pedro 



This shell is closely allied to the preceding ; but can be at once separated from 

 it by the angulation of the whorls and the presence of the tubercles. The out 

 line drawing, fig. 9 a, is restored from the lines of growth for the purpose of 

 showing the form of the lip. The species has not, as yet, been found living. 



P. (S.) PERVERSA. 



PI. 1, Fig. 10. 

 (P. (S.) perversa, Gabb; Proc. Cal. Acad. Nat. Sci., 1805, p. 183.) 



SHELL small, sinistral, elongate, slender; spire high, apex 

 usually bent to one side; whorls eleven to twelve, convex, 



