■274 



SUPPLEMENT TO THE EXTINCT BATKACHIA 



Measurements. -.. M. 



Length to middle of supra-occipital, . .055 



" " angle of quadrate, ; .0711 



Width at " " . ~ - - ■ . .069 



" " orbits (approximate), , , i .031 



Interorbital widlh, .0085 



No teeth are preserved with this cranium. A second specimen exhibits nothing more distinctly than the 

 one described. 



TUDITANITS OBTUSUS, Cope. 



Proceed. Amer. Philos. Soc, 1871, p. 177. Dendrerpeton oMusum, Cope, Transac. Amer. Philos. Soc, 1869, 

 XIV., p. 12. 



TUDITANUS MORDAX, Cope, Sp. Nov. 

 Represented by a partially complete cranium and some other fragments. 



The muzzle is broadly rounded as in T. obtusiis, and the premaxillary ti3eth are relatively much larger. The 

 bones are sculptured veith delicate acute radiating and iaosculatiag ridges. The maxillary bone is preserved for the 

 length of an inch ; its teeth are smaller than those of the premaxillary bone ; I count four in a line, which have a 

 simple conic crown. The external surface of the maxillary is not very strongly sculptured. The orbits and nares 

 are not well defined iu the specimen. 



TUDITANUS HUXLEYI, Cope, Sj). Nov. 



Represented by a considerable portion of the face and muzzle of a single individual. A portion of the left 

 mandible, supporting three teeth remains in place, and almost the entire boundaiy of the right orbit is preserved. 



The fragment indicates a much larger species than any other referred to the genus, and next to the Lepto- 

 pJiractus obsoUtus, the largest of the Batrachians of the Ohio Coal Measures. Without more complete remains it is 

 not easy to determine its generic relations finally. It differs from the Leptoplir actus in the absence of the symmetri- 

 cal scutellation of the cranium. 



The form of the head is probably elongate and the muzzle neither very obtuse nor elongate. The orbit is 

 rather small and near the middle of the length of the specimen, which is, however, incomplete at both ends. The 

 sculpture of the surface of the head posterior to the orbits, as well as round their borders and for some distance in 

 front of them, consists of a rather coarse pitting. On the middle line between the orbits and on the muzzle, the 

 intervals become narrower, and are confluent into transverse ridges or a delicate reticulation. The surface of the 

 mandible displays a coarse reticulation. 



The teeth are stoutly conic, and with delicately striate grooved cementuni. They are slightly i-ecurved. 



This species differs from the T. radiatus and T. obtusus, in the absence of the segmental areae into which the 



sculpture is thrown in them. 



3Ieasurements. M. 



Longitudinal diameter of orbit, 0.019 



Length of alveolar border supporting three teeth, .013 



Diameter of basis of tooth, .003 



Eight pits in, .010 



Dedicated to Professor Thomas H. Huxley, facile princeps among Eaglish systematists, and an important con- 

 tributor to the knowledge of the extinct Batrachia. 



LEPTOPHR ACTUS, Cop>e. 



Proceed. Acad. Nat. Sci., 1873, 340. 



LEPTOPHR ACTUS OBSOLETUS, Cope. 



Loc. cit., 1873, p. 341. 



