16 Mamm. 
II. MAMMALIA. 
Nehring, A. Die Trachtigkeitsdauer des Dachses. Zool. Garten, xxxiv, 
pp. 107-109. [See p. 29, Mustelidce.] 
•. Ueber Kreuzungen von Gavia aperea und Cavia cobaya. SB. Ges. 
naturf. Berlin, 1893, pp. 249-252. [See p. 33, Caviidw.] 
♦ Ueber Pleistocane Hamster-Reste aus Mittel- und Westeuropa. 
Jahrb. geol. Reichsanst. xliii, pp. 179-198. [Sco p. 31, Mur idee.] 
Nelson, E. W. Description of a New Species of Lagomys from Alaska. 
P. Biol. Soc. Washington, viii, pp. 117-120. [See p. 33, Lagomyidce.] 
Noack, T. Das Quagga. Zool. Garten, xxxiv, pp. 289-297, 1 pi. 
. Ein neues Gnu. Zool. Anz. 1893, pp. 153-156. [See p. 37, 
Bovidce.] 
Osborn, H. F. The Ancylopoda } Chalicotherium , and Artionyx. Amer. 
Natural, xxvii, pp. 118-133, figg. [See p. 35, Ancylopoda.] 
— . Protoceras : the New Artiodactyle. Nature, xlvii, pp. 321 & 322. 
. Aceratherium tridactylum from the Lower Miocene of Dakota. 
Bull. Amer. Mus. v, pp. 85 & 86. 
. Recent Researches upon the Succession of the Teeth iu Mammals. 
Amer. Natural, xxvii, pp. 493-504. 
A general review of recent investigations on the development and 
relations of Mammalian teeth, especial attention being directed to the 
views of Kiikenthal, Rose, and Taeker. While adopting many of these 
views, especially that of the equivalence of the true molars with thetlrst 
series, the author is indisposed to admit fission as an agent in dental 
development, and insists strongly upon the prime importance of trituber- 
culism. 
. Sur la d6couverte du Palcconictis on Amdriquo. Bull. Soc. Geol. 
France (3) xx, pp. 434-436, fig. 
Figures an incomplete skull of a species named in 1892. 
— - The Rise of the Mammalia in North America. Stud. Biol. Lab. 
Columbia Coll., Zool. i, No. 2, 45 pp., and Amer. J. Sci. (3) xlvi, 
pp. 379-406 & 448-466, pi. xi. 
An important and suggestive memoir, dealing with the dental charac- 
ters, foot-structure, aud evolution of Mammals in general, and containing 
disquisitions on particular groups. Adopting recent views on the evolu- 
tion and relations of teeth, the author gives a table showing the manner 
in which the first and second series are developed or aborted in the chief 
groups ; and he adds that the abortion of the second series in the 
Marsupials is a fatal bar to the view that this group is in any way 
ancestral to the Placentals. Trituberculism and the evolution of Ungu- 
late molars are discussed in detail. Iu the course of the memoir, the 
author takes the opportunity of recording his dissent from the view that 
the Mammals of the Santa Cruz beds of Patagonia are of Eocene age, 
