Vol. 5] Jordan. — The Fossil Fishes of California. 



113 



C. branneri. In C. branneri the tooth is more curved, it is ser- 

 rated on both sides to the point, and there is no trace of lateral 

 denticle or protuberance. 



This species, Carcliarodon rectus, is perhaps nearer than any 

 of the others here named to the living man-eating shark, Carclia- 

 rodon carcliarias, now found on the California coast. In that 

 species, the serrations are fine, and range from ten to thirty-five 

 in number on the different teeth. For the following count made 

 by Mr. Samuel Garman on the jaws of this species, I am indebted 

 to Mr. Barton A. Bean. Mr. Garman says: 



"The count of serrations on right-hand jaws of Carcliarodon, 

 from the tenth tooth toward the symphysis, runs as follows : 



UPPEE. 



10 9876 54321 

 0|10 10113 13118 21120 27|25 25|28 23|27 26|25 30132 28125 



LOWER, 



8 7 6 5 4 3 2 1 Outer. 



151 181 161 20121 19|20 21|22 31|35 25|25 Inner. 



"I have counted all serrations possible, so the numbers are 

 not too small, but find very doubtful places and much variation. 

 Thus some that might be called single denticles have two or three 

 subdivisions, and toward the ends of the serrations the denticles 

 and notches fade away so that one can hardly say where they 

 end." 



18. Carcliarodon arnoldi Jordan. 



In the Pliocene at Pescadero, San Mateo County, Professor 

 James M. Hyde, of the University of Oregon, has found a tooth 

 of Carcliarodon, now in the Museum of Stanford University. 

 This is evidently different from Carcliarodon riversi, having the 

 serrae rather smaller and more numerous, about fifty on each 

 side of the tooth, which is serrated to the tip. The type is about 

 one and one-half inches high, triangular, the crown a little higher 

 than broad, with straight edges, the tooth slightly curved back- 

 ward, that is, in the line of the axis of the fish. Inner base of 

 crown of tooth with four shallow furrows. No larger denticles at 

 base of the tooth. 



