106 



University of California Publications. 



[Geology 



tions, rather larger than in H. hereopleurus, and without break at 

 the base of the crown. The outer edge of the tooth is partly im- 

 bedded, and I can trace no denticles on it. The median line of 

 the tooth has a rather conspicuous ridge as in Galeus, to which 

 genus this tooth bears some resemblance. 



10. Lamna clavata Agassiz. 



The genus Lamna is known from Isurus by the presence of 

 one or two small denticles at the base of a flexuous tooth, the 

 edges of which are entire. 



According to Agassiz, the species is allied to Lamna cuspidata 

 of the European Miocene, differing in its shorter and narrower 

 crown, in which it agrees with L. hopci of Sheppy. The crown is 

 less arched than in the latter. The posterior surface is smooth as 

 in Lamna cuspidata. 



Fig. 8. Lamna clavata Agassiz. Miocene of Kern County, California. 



Three finely preserved teeth supposed to be from Miocene de- 

 posits in Kern County, in the Museum of Stanford University, 

 the exact locality not recorded. Length, 1% inches. Breadth of 



Family LAMNIDJE. 



Genus Lamna Cuvier. 



