98 



University of California Publications. 



[Geology 



this paper are open to some question, the degree of which is 

 scarcely fully indicated by the query marks used by the author. 



Family HYBODONTID^E. 



Genus Hybodus Agassiz. 



1. Hybodus shastensis Wemple, Bull. Dept. Geol., Vol. V, p. 73. 



Three small teeth of a species of Hybodus from the upper 

 Triassie of the Shasta region at the locality known as Bear Cove, 

 in the Museum of the University of California. One of these, 

 No. 10,255, has been made the type of a species called Hybodus 

 shastensis, by Miss Edna M. Wemple. This specimen has a con- 

 ical crown, rising from a broad lunate root, of which the breadth 

 is twice the height of the crown. The crown is rather pointed, 

 nearly erect, and on one side of the base are 

 two much smaller cusps well separated from 

 the large one with a slight rounded denticle 

 between. Two similar cusps exist on the 



other side, according to Miss Wemple, but 

 Fig. 1. Hybodus 

 shastensis Wemple. they are more or less obscured in the speci- 



Upper Triassie, Shasta mm whk-h is partly imbedded in hard, 

 County, California. 



Type specimen. black calcareous rock. The whole crown of 



the tooth is striated, rather coarsely when 

 we consider the size of the tooth. This species is certainly a 

 Hybodus and it is allied to the European Hybodus grossiconus 

 of Ag'assiz. 



The following description is from Miss Wemple 's manuscript: 



"Type, one detached tooth. No. 10,255, Univ. Cal. Col. Vert. 

 Palae. From the Upper Triassie at the west end of Bear Cove, 

 Shasta County, California. 



"The crown supports a high, robust, principal cone with a 

 broad base. There are five lateral denticles. The upper portion 

 of the principal cone is rather sharply narrowed. The lateral 

 denticles, two on one side and three on the other, all are short and 

 robust with narrowed tips. 



"The sides of the principal cone and all of the denticles are 

 cut into numerous strongly marked ridges. The crown overhangs 

 the base slightly. The base is wide, with one margin deeply seal- 



