gg CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



slightly sinuous ; inner lip sinuous, flattened and twisted. Char- 

 acteristic of lower Martinez. Locality 4, L. S. J. U. Pal. Coll. 

 Named for Mr. Geo. McCready of Guanoco, Venezuela. 



Turritella pachecoensis Stanton 

 PI. 12, Fig. 20 



T. saffordi Gabb, Pal. Cal., vol. 1, p. 135, pi. 2, fig. 93. 



T. pachecoensis Stanton, U. S. Geol. Surv. 17th An. Rept., 

 pt. 1, p. 1043, pi. 66. figs. 1 and 2. 



Adult with 15 whorls that are flattened on the sides and more 

 or less angulated above and below, near the channeled suture ; 

 surface of early whorls marked by fine spiral lines which are 

 usually obsolete in the older, more sinuous whorls. In very old 

 individuals, obscure tubercles are sometimes formed on the 

 angles of the whorls. Localities 4, 5, and 8, L. S. J. U. Pal. 

 Coll. 



This species is found also in the Tejon. 



Turritella reversa, new species 

 PI. 12, Fig. 15 



Adult with about 15 whorls that are nearly vertical on the 

 sides and slightly rounded above, near the suture ; base of the 

 whorls slightly concave ; whorls ornamented with fine revolving 

 lines. Locality 4, L. S. J. U. Pal. Coll. 



This species resembles T. hiimerosa Conrad. "^^ The apical 

 angle is about the same as that of the Maryland species. 



Turritella simiensis, new species 

 PI. 14, Fig. 15 



Adult with about 15 whorls, that are convex above, flattened 

 on the sides, and marked by a heavy rib or enlargement of the 

 lower angle ; whorls ornamented by about nine spiral lines, the 

 third from the top of which is larger ; apical angle greater than 

 that of T. pachecoensis. The older whorls tend to develop, ir- 



»» Maryland Geol. Surv., Eocene, 1901, p. 148, pi. 27, figs. 1 and la. 



