[18] Bol. Inst. Geog. Argen., t. 18, p. 442, fig. 25, 1897.
[19] Bul. Soc. Geol. France, ser. 4, t. 5, p. 305, 1905.
[20] I have a lower jaw of Propolymastodon which, though not complete in front, gives me no suggestion that the incisor was rodent-like, and I am inclined to think that the incisor associated with the type of P. carlo-zitelli is a mistake.
[21] Osborn, Bul. Amer. Mus. Nat. Hist., Vol. 24, p. 265.
[22] Bol. Inst. Geog. Argen., t. 18, p. 508, 1897.
[23] Bol. Acad. Nac. Cienc. Cordoba, t. 17, p. 56-66, 1902, no figures.
[24] There is a discussion as to the homologies of the premolars of marsupials and placental mammals, the one proposition being that marsupials have three premolars and four molars, the other that they have four premolars and three molars as in placentals. The evidence is not conclusive as to either proposition, but in this paper I have designated these teeth along the latter line of thought.
Transcriber’s Notes:
Antiquated spellings were not corrected.