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University of California Publications in Geology [Vol.8 



along with a new species described from the Lower Carboniferous of 

 Illinois. As no teeth have been associated with these spines their 

 affinities with S. shastensis are not known. Their wide separation in 

 time would suggest that the forms are not very closely allied for the 

 European genera are represented in formations lower than the 

 Triassic. 7 



So far as known to the writer this is the first record of the non- 

 keeled type of cestraciont teeth in America. A number of teeth be- 

 longing to the genera Acrodus and Hybodus 8, have been described 

 from the Middle Triassic of Nevada and from the Upper Triassic in 

 Shasta County, California, but these bear no close affinity to Slro- 

 phodus shastensis. Members of these three genera appear to be the 

 only cestracionts found in the Triassic in America. 



7 Smith, J. P., The occurrence of coral reefs in the Triassic of North America, 

 Amer. Jour. Sci., vol. 33, 92-96, 1912. 



s Wemple, E. M. New cestraciont teeth from the West American Triassic. 

 Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, 71-73, 1906. 



Jordan, D. S., The fossil fishes of California, Univ. Calif. Publ. Bull. Dept. 

 Geol., vol. 5, 95-144, 2 pis., 1907. 



Transmitted December 16, 1913. 



