LABYRIXTHODOXTIA 183 



By the professor's advice they were brought to England and 

 submitted to the writer, who has described and figured them* 

 as batrachian, under the name Dendrerpeton Acadianum, and 

 with close affinities, from the plicated structure of the teeth, 

 the sculpturing of some broad cranial plates, and the structure 

 and proportions of certain limb-bones, to the genus Archego- 

 saurus. The subsequent discovery of carinate scales with 

 bones of the Dendrerpeton adds to the probability of its apper- 

 taining to the Ganocephalous order. 



Genus Eaniceps. — In about the centre of the great car- 

 boniferous basin of Ohio, United States, at the mouth of the 

 " yellow creek," is a seam of coal 8 feet in thickness, the lower 

 four inches of which is " cannel coal." In this has been found 

 the skull, part of the vertebral column, scapular arch, and fore 

 limbs of a reptile referred by Professor Wymanf to the batra- 

 chian sub-class, under the name of Ranieeps. Two closely- 

 allied fossils, also referred to Batrachia, have been found in the 

 same formation and locality. 



Order IT. — Labyrinthodontia. 



Head defended, as in the Ganocephala, by a continuous casque 

 of externally sculptured and unusually hard and 

 polished osseous plates, including the supplementary 

 " post-orbital" and " super-temporal" bones, but leaving 

 a " foramen parietale." Two occipital condyles. Vomer 

 divided and dentigerous. Two nostrils. Vertebral 

 bodies, as well as arches, ossified, biconcave. Pleur- 

 apophyses of the trunk, long and bent. Teeth rendered 

 complex by undulation and side branches of the con- 

 verging folds of cement, whence the name of the order. 



The reptiles presenting the above characters have been 

 divided into genera, according to minor modifications exempli- 



* Quarterly Journal of the Geological Society, vol. ix., 18/53. 

 f American Journal of Science and Arts, March 1857. 



