ADDENDA. 225 



Hylerpetom dawsoni, Owen l . 

 The type species. Length of mandible 0,044. 

 Hab. Nova Scotia. 



R. 441-442. Pour fragments of rock, showing a tooth and numerous 

 dermal scutes ; from the Coal-Measures of Nova Scotia. 

 The scutes resemble the specimens figured by Dawson in 

 the ' Phil. Trans.' for 1882, pi. xli. By exchange, 1884. 



Hylerpetum longidentatum, Dawson 2 . 



Said to be distinguished from the type species by the longer and 

 more slender teeth, and the greater breadth of the median thoracic 

 plate. 



Hab. Nova Scotia. 



R. 440. Four fragments of rock, showing part of a jaw, an imperfect 

 median thoracic plate, and numerous dermal scutes ; from 

 the Coal-Measures of South Joggins, Nova Scotia. 



By exchange, 1884. 



Family Uncertain, 



Genus FRITSCHIA, Dawson 3 . 

 Comprises a small lizard-like form, characterized by its slender 

 rod-like dermal scutes, which resemble those of Ojohiderpetum. The 

 genus may perhaps be allied to Urocordylus. 



Fritschia curtidentata, Dawson 4 . 

 The type species. 

 Hab. Nova Scotia. 



It. 449. Fragment of rock, showing part of a jaw and other imper- 

 fect remains ; from the Coal-Measures of South Joggins, 

 Nova Scotia. By exchange, 1884. 



1 Quart. Journ. Geol. Soc. vol. xviii. p. 241 (1868) 



2 Phil. Trans, for 1882, p. 640 (1883). 



3 Ibid. -p. 641. 4 Loc.cit. 



TART IV. 



