190 University of California Publications in Geology [Vol. ll 



Dimensions. — Height, about 26 mm.; height of body whorl, 15.5 mm.; greatest 

 diameter of body whorl, 11 mm. 



Occurrence. — So far this species has been found only at the type locality. 

 Several good impressions were obtained ; the type is a wax cast made from one 

 of these. Associated with Acila gettysburgensis, Tellina lorcnzoensis, Fusinus 

 hecoxi, Pseudoperissolax merriami, Strepsidura ef. calif omica, Turris perissolax- 

 oides, etc. 



TUERIS (PLEUEOTOMA) PERISSOLAXOIDES (Arnold) 



Pleurotoma perissolaxoides Arnold, Proc. U. S. Nat. Mus., vol. 34, p. 368, 



pi. 33, fig. 13, 1908. 

 Turris perissolaxoides Arnold, Weaver, Univ. Wash. Pub!. Geol., vol. 1, 



no. 1, p. 30, 1916. 



Occurrence. — University of California locality 3051, between Pinole and Bear 

 Creek on north side of Sobrante anticline, about fifty feet below Kirker tuff 

 member. Associated with Acila gettysburgensis, Tellina lorcnzoensis, Calliostoma 

 laussoni, Fusinus hecoxi, Pseudoperissolax merriami, Strepsidura ef. calif omica, etc. 



TURRIS (PLEUROTOMA) THURSTONENSIS Weaver 



Plate 23, figures 11 and 12 



Turris thurstonensis Weaver, Univ. Wash. Publ. Geo]., vol. 1, no. 1, p. 54, 

 pi. 5, figs. 79, 80, 1916. 



This is one of the few highly ornamented gastropods common to 

 the Lower Oligocene, Molopophorus lincolnensis zone as described by 

 Weaver, and the Agasoma gravidum beds. At the type locality it is 

 found associated with Exili-a lincolnensis Weaver. These two species 

 are also found associated in the same beds in the San Eamon forma- 

 tion, University of California localit}' 1131. 



Class SCAPHOPODA 

 Family Dentaliidae 

 Genus DENTALIUM Linnaeus 

 DENTALIUM PETRICOLA Dall 



Teredo substriata Conrad, Geol. U. S. Expl. Exp., vol. 10, Geol., p. 728, 



pi. 20, figs. 7 and 7b only, 1849. 

 Dentalium petricola Dall, n.nom., U. S. Geol. Surv., Prof, paper no. 59, 



p. 136, 1909. 



A common species in both the Oligocene and Lower Miocene. 



DENTALIUM CONRADI Dall 



Teredo substriatum Conrad, Geol. U. S. Explor. Exped., vol. 10, Geol., 



p. 728, pi. 20, fig. 7a only, 1849. 

 Dentalium substriatum Conrad, Carpenter, Rep. Brit. Assoc. Adv. Sci., 



p. 367, 1856. 



Dentalium substriatum Conrad, Amer. Jour. Conch., vol. 1, p. 151, 1865. 



