UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 8, No. 3, pp. 27-30 



Issued March 28, 1914 



TEETH OF A CESTRACIONT SHARK FROM THE 

 UPPER TRIASSIC OF NORTHERN 

 CALIFORNIA 



STROPHODUS SHASTENSIS, n. sp. 



Type specimen no. 20041, Univ. Calif. Col. Vert. Palae., from upper beds 

 of the llosselkus Limestone at Cow Creek, Shasta County, California. 



The material on which the species is based consists of five well- 

 preserved teeth and a fragment of a sixth. Except in two instances 

 the teeth were exposed so that no preparation was necessary. The 

 type specimen (no. 20041), although fractured, still shows its original 

 character. Specimen no. 20045 furnishes a good elevation of the 

 tooth. Lack of comparative material has precluded a definite deter- 

 mination of the position of the teeth in the series or even whether they 

 represent the upper or lower jaw. 



The largest of the teeth (no. 20041) (fig. 1), is probably from an 

 anterior series. It is 39 millimeters in length and 8 millimeters in 

 width. It is slightly narrower at the rounded anterior and posterior 

 ends (5 millimeters at anterior end; 7 millimeters at posterior end). 

 The crown is almost fiat and the surface is marked by fine reticulations, 

 the striae running transversely across the tooth. No keel is present. 

 The enamel is nearly a millimeter in thickness except at the sides of 

 the tooth, where it is somewhat thinner. The overhanging margin of 

 the crown is less distinctly reticulated than the upper face. The 

 character of the root is not apparent in this specimen. The whole 

 tooth is arched, the greatest curvature being about halfway between 

 the middle of the tooth and the posterior end. 



BY 



HAROLD C. BRYANT 



APR 3 1914 



