ZAT.] 



BATRACHIA. 



627 



mordax, Cope, 1875, Ohio Pal., vol. 2, p. 395, 



syn. for Ceraterpeton punctolinatum. 

 obtusus, Cope, 1868, (Dendererpeton ob- 



tusum,) Proc. Acad. Nat. Sci. Phil., p. 



213, and Ohio Pal., vol. 2, p. 396, Coal 



Meas. 

 punctulatus, Cope, 1874, Trans. Am. Phil. 



Soc, vol. 14, p. 10, and Ohio Pal., vol. 



2, p. 392, Coal Meas. 

 radiatus, Cope, 1874, Trans. Am. Phil. 



Soc, vol. 14, p. 10, and Ohio Pal., vol. 



2, p. 394, Coal Meas. 

 tabulatus, Cope, 1877, Proc. Am. Phil. 



Soc, p. 577, Coal Meas. 

 Zatkachys, Cope, 1878, Pal. Bui. No. 29, 



and Proc. Am. Phil. Soc, vol. 17, p. 



523. [Ety. za, an intensive; trachys, 

 rough.] Teeth in single series, and 

 anchylosed to the bottom of a shallow 

 groove, the external boundary of which 

 is most prominent, so the attachment 

 of the teeth is shortly pleurodont;. 

 teeth have conic crowns and basal 

 grooves; cranium sculptured, its table 

 with a notch on each side ; two occip- 

 ital condyles ; no intercalary horns. 

 Type Z. serratus. 



apicalis, Cope, 1881, Am. Naturalist, vol. 

 15, p. 1020, Permian. 



serratus, Cope, 1878, Pal. Bull. No. 29, and 

 Proc. Am. Phil. Soc, vol. 17, p. 523, 

 Permian. 



