ADDENDA. 223 



ADDENDA TO LABYRINTHODONTJA. 



{The folloiving specimens were overlooked until the preceding por- 

 tion of the text was in type ; the whole of them were determined 

 by Sir J. W. Dawson.) 



Family DENDRERPETIDJE (p. 170). 



Genus DENDRERPETUM (p. 170). 

 Dendrerpetum acadianum, Lyell & Dawson *. 

 The type species. 

 Hob. Nova Scotia. 



434-438. Fragments of rock showing numerous imperfect remains ; 

 from the Coal-Measures of Nova Scotia. 



By exchange, 1884. 



Dendrerpetum oweni, Dawson 2 . 



Readily distinguished from B. acadianum by its smaller size, 

 more delicate cranial structure, longer and more curved teeth, and 

 narrower and more pointed ventral scutes. 



Hah. Nova Scotia. 



R. 439. Fragment of rock showing part of a jaw, cranial bones, and 

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



By exchange, 1884. 



Family HYLONOMID.E (p. 201). 

 Genus HYLONOMUS (p. 201). 

 Hylonoxrms lyelli, Dawson 3 . 

 The type species. Length from 0,127 to 0,152 (5 to 6 inches). 

 Teeth numerous. 

 Hob. Nova Scotia. 



443-445. Fragments of rock showing numerous fragmentary 

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

 Scotia. No. R. 445 shows part of a maxilla and palatine. 



By exchange, 1884 . 



1 Quart. Journ. Geol. Soc. vol. ix. p. 58 (1853). 



2 Air-Breathers of the Coal-Period, p. 32 (1863). 



3 Quart. Journ. Soc. vol. xvi. p. 274 (1859). 



