332 



University of California Publications. 



[Geology 



The dentition described does not closely resemble that of any 

 form known to the writers. The evident reptilian character of 

 the skeletal elements precludes any close relationship to the 

 pyconodont fishes or to the cestracionts. Of the reptilian forms 

 the rhynchosaur Hyperodapedon has several rows of depressed 

 conical teeth on the maxillary and palatine. They are, how- 

 ever, quite different in size, and apparently in function, while 

 the skull characters of the two forms are far apart. "Whatever 

 the relationships of Omphalosaurus may prove to be when the 

 skeleton is better known, the dentition is evidently a peculiarly 

 specialized one, which has been adapted to a diet of which shell- 

 covered mollusca formed an important part. 



Transmitted July 11, 1911. 



