1S9-.'.] Z40 [Baiir. 



of the mandibuliir ramus omitted. In the present paper these omissions 

 are mostly supplied, but a number of important problems remain to be 

 dt'finitely settled. See Trans. Amer. Philos. Soc, 1892, Vol. xvii, p. 17, 

 where one of these is staled. I pointed out in 1866, when the genus 

 Lfelaps was described, and later, in 1869 (Vol. xiv, Trans. Amer. Philos. 

 Soc.), that it differs from Megalosaurus in the much more acute and com- 

 pressed claws. I add that the present species differs from the M. nase- 

 cornis of Marsh in the much larger and more anteriorly placed orbits, and 

 in the much smaller prerobital foramen. 



Figures of these remains will be given in the final publication by the 

 Geological Survey of Canada. 



Addition to the Note on the Taxonomy of the Oenus Emys C. Bumeril. 



By G. Baur. 

 [Read before the American Philosophical Society, May 6, 1S92.) 



In a discussion about the type of Emys with Dr. L. Hejneyer, this 

 gentleman called my attention to the fact that, according to the Code of 

 Nomenclature adopted by the American Ornithologists' Union, the type 

 species could not be T. picta, because this species is not named by Brog- 

 niart. According to his view not only the name Emydes ought to be used, 

 as originally introduced by Brogniart in 1805 (Emys Dum., 1806), but 

 also one of the species enumerated by Brogniart taken as the type. Brog- 

 niart mentions the following species with his genus Emydes: E. ferox, 

 E. rostrata, E. matamata, E. Intara, E. pensilvanica, E. clausa. In 1806 

 Dumeril referred the E. matamata to a new genus Chelus ; in 1809 Geof- 

 frey E. ferox and E. rostrata to Trionyx, E. pensilvanica belonging to 

 kinosternon Spix ; either E. lutaria or clausa has to be considered as 

 type of Emydes. E. lutaria=^ T. orbicularis L. being the common Emy- 

 saean form, ought to be taken as type of Emydes, and E. clausa^^ T. Caro- 

 lina L. ought to be considered as type of Terrapene Merrem., of which 

 Cistuda Fleming is a synonym. 

 According to this we would have the following : 

 Emydes Brogniart, 1805, 



Type, T. orbicularis L. 

 Terrapene Merrem, 1820, 

 Type, T. Carolina L, 

 Chrysemys Gray, 1844, 



Type, T. picta (Herrm. MSS.) Schn 



