270 Palmer — Generic and Family Names of Modents. 



Palaiotrogus Jiiger, 1839 ... Palaiotrogus steinheimensis. 



Paradoxoint/s ^ Ameghino, 1885. . Panidoxomtjs cancrivorus. 



Protechynus Filhol, 1891 Nonieii nudum. 



Protoptychiis ^ Scott, 1895 Proloptychus hatcheri. 



^ I'aradoxomyina Ameghino, Bol.Acud. Nac.Cien., Cordoba, IX, p. 79, 1886. 



P(tradoxo)nyd,r Ameghino, Mam. Fos. Rejnib. Argentina, in Actas Acad. 

 Nac. Cicncias, Cordoba, VI, p. 122, 1889. 



'■'"The genus is probablj^ to be regarded as the ancestral type of the 

 Dipodidse, and indicates an American origin for this family." — Scott, 

 Proc. Acad. Nat. Sci. Phila., 1895, p. 286. 



