224 



ADDENDA. 



Hylonomus wymani, Dawson l . 

 Smaller and more slender than the type species, with the teeth 

 less numerous (about 22 in mandible), shorter and more obtuse. 

 Hah. Nova Scotia. 



R. 446. Fragments of rock with imperfect remains ; from the Coal- 

 Measures of South Joggins, Nova Scotia. 



By exchange, 1884. 



Hylonomus latidens, Dawson 2 . 

 Said to be of stouter build than the type species ; with relatively 

 shorter limbs. Generic position doubtful. 

 Hah. Nova Scotia. 



R. 447. Fragment of rock with part of a jaw and other imperfect 

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

 Scotia. By exchange, 1884. 



Genus SMILERPETUM, Dawson 3 . 

 Yery imperfectly known. Said to be distinguished from Hylono- 

 mus by the wedge-shaped teeth, the presence of numerous teeth on 

 the vomers and palatines, and the form of the presumed caudal 

 vertebse. 



Smilerpetum aciedentatum, Dawson 4 . 

 Syn. Hylonomus aciedentatus, Dawson 5 . 



The type and only described species. 

 Hah. Nova Scotia. 



R. 433. Three fragments of rocks showing part of a jaw and some 

 other imperfect remains ; from the Coal-Measures of Nova 

 Scotia. By exchange, 1884. 



Genus HYLERPETUM, Owen 6 . 

 Imperfectly known. Cranial bones finely striated. Marginal 

 teeth conical, smooth at the base, but finely grooved near the sum- 

 mit ; numerous small palatal teeth, with some larger ones. Ver- 

 tebras with short and cylindrical centra, and well-developed spines 

 and zygapophyses. 



1 Quart. Journ. Geol. Soc. vol. xvi, p. 276 (1859). 



2 Phil. Trans, for 1882, p. 637 (1883). 3 Ibid. p. 6S8.—Smilerpeton. 

 4 Quart. Journ. Geol. Soc. vol. xvi. p. 275 (1859). — Hylonomus. 



6 Loc. cit. 



6 Quart. Journ. Geol. Soc. vol. xviii. p. 281 (1862). — Hylerpeton. 



