. Bulletin of the Department of Geology. Geology. Vol. 5] Jordan.—The Fossil Fishes of California. 109 tained by Dr. Bowers on Carrizo Creek, San Diego County, near the Mexican line. This tooth is flat, narrowly triangular, and nearly erect. 14. Isurus tumulus Agassiz. (OxyrMna tumula Agassiz, 1. c. p. 275; Ocoya Creek.) Many specimens of Isurus, large and small, seem to belong tc a species of Isurus distinct from Isurus planus. The scanty de- scription of Isurus tumulus, characterized by "the extraordinary. Fig. 10. Isurus tumulus (Agassiz). Miocene of Kern Comity, California. thickness
. Bulletin of the Department of Geology. Geology. Vol. 5] Jordan.—The Fossil Fishes of California. 109 tained by Dr. Bowers on Carrizo Creek, San Diego County, near the Mexican line. This tooth is flat, narrowly triangular, and nearly erect. 14. Isurus tumulus Agassiz. (OxyrMna tumula Agassiz, 1. c. p. 275; Ocoya Creek.) Many specimens of Isurus, large and small, seem to belong tc a species of Isurus distinct from Isurus planus. The scanty de- scription of Isurus tumulus, characterized by "the extraordinary. Fig. 10. Isurus tumulus (Agassiz). Miocene of Kern Comity, California. thickness of the root of the tooth," seems to apply to this form. We have upward of 100 specimens obtained by Mr. Anderson from the Miocene of Barker Ranch, and especially from the Mio- cene four miles east of Oil City, with large examples from near Santa Ana. In some of these the tooth is two and one-half inches in height, a size enormous for an Isurus. The crown is rather slender, narrowly triangular sometimes, somewhat flexuous, the outer teeth broadly triangular, all the teeth much more convex in section than in Isurus planus, and less flat. The base is thicker, usually broadly lunate. None of the teeth are so strongly hooked. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of California, Berkeley. Dept. of Geology. Berkeley : The University Press
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