100 



University of California Publications. 



[Geo log's 



Genus Acrodus Agassiz. 



This genus differs from Hybodus in having the teeth rounded, 

 without cusps. 



2. Acrodus wemplice Jordan, new species. 



Six teeth of a species of Acrodus, from the Triassic of the 

 Shasta region at Bear Cove and North Fork, are in the Univer- 

 sity of California Collection. These are found in the same black 

 calcareous rock as Hybodus shastensis. The type of this species 

 is a long and narrow tooth, % inch in transverse length, slightly 



Fig. 2. Acrodus wemplice w ith these, and especially with Acro- 



dian ridge or furrow. All the other specimens (Nos. 10,190, 

 10,198, 10,201, 10,202, 10,203) are more or less broken, but all 

 agree in general type. 



Another specimen of a tooth of Acrodus, received later (No. 

 1,068), seems to have come from the mouth of the same species of 

 shark. It is, however, somewhat different in form and of a more 

 specialized character. There is a low median elevation at the 

 center of the tooth, almost amounting to an obtuse cusp. At this 

 point the two halves of the tooth meet with a distinct angle. This 

 central part of the tooth is thickened, deepened and rounded, and 

 the stride radiate from its center. As the sides of the tooth are 

 formed and striated very much as in the type of Acrodus wem- 

 plice, I think this probably a more specialized tooth of the same 

 species. 



The species is named for Miss Edna M. Wemple of the Univer- 

 sity of California, who first recognized the species. 



curved and compressed, tapering each 

 way, crossed by very fine wrinkles, 

 about twenty-five on each side of the 

 middle ; no distinct median ridge. The 

 species is near the European A. keu- 

 perinus and A: hirudo. Compared 



Jordan. Triassic of Shasta 

 region. Type specimen. 



dm gaillardoti Agassiz, the teeth are 

 narrower, with finer striae, and no me- 



