AMERICAN LABYRINTHODONTIDM 591 



tals quadrate, a little longer than broad. Posterior outline of 

 the cranium with a superficial transverse concavity on each side, and 

 not with a deep sinus as in Trematosaurus and Archegosaurus. 

 Breadth of occipital outline 28 lines; length of parietals 8| lines; 

 breadth anteriorly 3! lines, posteriorly 3 lines. Probable length of 

 head, considering it to have nearly the proportions of Trematosaurus, 

 4 inches, breadth i\ inches. 1 



Eupelor Cope 



Mastodonsaurus Cope, 1866 ("Observations on Extinct Vertebrates of the Meso- 



zoic Red Sandstone," Proceedings of the Academy of Natural Sciences of 



Philadelphia, p. 250). 

 Eupelor Cope, 1868 ("Synopsis of the Extinct Batrachia of North America," 



ibid., p. 221). 

 Eupelor Cope, 1869 ("The Extinct Batrachia, Reptilia, and Aves of North 



America," Transactions of the American Philosophical Society, Vol. XIV, 



P- 25). 

 Eupelor Miall, 1874 ("On the Structure and Classification of the Labyrintho- 



donts," Report of the British Association for the Advancement of Science, 



p. 186). 

 Eupelor Fritsch, 1879 {Fauna der Gaskohle und der Kalksteine der Permforma- 



tion Bohmens, Vol. I, p. 62). 

 Eupelor Cope, 1886 ("Note on the Fossils of the Mesozoic Rocks in York County, 



Pa,." Proceedings of the American Philosophical Society, p. 403). 

 Eupelor Cope, 1887 ("A Contribution to the History of the Vertebrata of the 



Trias of North America," ibid., p. 209). 

 Eupelor Zittel, 1890 {Handbuch der Palaeontologie, Vol. Ill, p. 408). 

 Eupelor Cope, 1892 ("A Preliminary Report of the Llano Estacado," Geological 



Survey of Texas, Fourth Annual Report, pp. 12 and 17). 

 Eupelor von Huene, 1902 (Uebersicht iiber der Reptilien der Trias, pp. 68-82). 



Postorbitals n cm long; parietals 7 cm wide behind and io cm 

 between the postorbitals. On the posterior part of the interorbital 

 region commence two smooth, shallow sulci 29 mm apart; between 

 them the surface is pitted four or five to the inch. The parietal 

 bones are longitudinally sulcate throughout. All other bones with 

 a coarse honeycomb pattern of sculpture-, the pits becoming confluent 

 into radiating grooves near the margins. Base of mandibular teeth 

 cylindric, with shallow grooves. An interclavicle measures 345 mm 

 long by i4o mm broad. 



1 Proceedings of the Academy of Natural Sciences of Philadelphia, Vol. VIII, 

 p. 256. 



