PALEOZOIC AIR-BEEATHING ANIMALS. 78 



8. HyLERPETON intermedium, S. 11. 



This species is known as yet only by the maiidihles and portions of the skull, which are 

 rather shorter than those of adult individuals of the last species. The extremity of the 

 mandible and the cranial bones have the same slightly waved surface as in the other species. 

 Mandibles three centimeters long and the teeth which arc about fifteen in each ramus of the 

 lower jaw are simple, with large pulp cavities. Those of the maxillary bone slightly enlarg- 

 ing ujiwards, and intermediate in form between the long slender teeth of H. lotigidentatuui 

 and the thick obtuse teeth of H. Dawsoiii. 



Coal Formation, S. Joggins, N. Scotia, in erect tree, discovered by P. W. McNaughton, 

 1893. 



Genus Fritschia, Dawson. 



Body lizard-like. Limbs large and well ossified. Mandibular and maxillary teeth 

 conical, grooved at apex. Abdominal scales slender and rod-like. 



9. Fritschia curtidentata, Dawson. 

 IHylerpeton curlidentalum, Prdliminary Notice, Am. J. Sa\.,l.c. Trans. E. S., II., 1S82, p. 641.] 

 Coal Formation, S. Joggins, Nova Scotia, col. J. "W. D., 1879. 



Genus Amblyodon, Dawson. 



A genus characterized by stout cylindrical teeth, blunt at the apices ; but otherwise 

 imperfectly known. 



10. Amblyodon problematicum, Dawson.' 



[Trans. K. S., 11., 1882, p. 644.] 

 Coal Formation, S. Joggins, Nova Scotia, col. J. W. D., 1878. 



Genus Sparodus, Fritsch. 

 11. Sparodus, sp.' 



[Trans. K. S., 11., 1882, p. 643.] 

 Coal Formation, S. Joggins, Nova Scotia, col. J. W. D., 1878. 



All of the above species of Microsauria have been found in the interior of erect trees at 

 the South Joggins, in I^ova Scotia, a mode of occun-ence which indicates that they were 

 eminently terrestrial in their habitat. See note appended. 



Family Dendrerpetonidce, Fritsch. 



(Gasirolepidoti, Zittel.) 



In general form, and in the arrangement of the bony and horny scales, these animals 

 resemble the Microsauria, but the teeth are furrowed and have the enamel plicated at the 

 base, and the surface of the cranial bones is strongly sculjjtured. They are on the whole 



' These species are uncertain as to their classitication. 



