THE GENERAL SUBJECT. 
Mamm. 15 
[Schlosser, M ] Die Differenzierurig des Saugetiergebisses. Op. cit. x, 
pp. 238-252 & 264-277, woodcuts. 
The first part treats ;of the evolution of the more complex forms of 
Mammaliau molars from the tritubercular type ; while the second is 
devoted to the modifications in the number and functions of the teeth in 
the various orders. 
. Ueber die Deutung des Milchgebisses der Saugetiere. T. c. 
pp. 81-92. 
Criticizos tho conclusions of 0. Thomas as to the homology of the 
teeth in various groups of Mammals, and especially disputes the view that 
the milk-dentition is a series superadded to the permanent one. It is 
also urged that the anterior cheek-teeth of Elephas are not milk but 
premolars. [For a criticism, see O. Thomas, p. 17.] 
Schulze, E. Yerzeichniss der Saugethiere von Sachsen, Anhalt, 
Braunschweig, Hannover, und Thiiringen. Z. Nat. lxiii, pp. 97-112. 
Sclater, P. L. [See Rhino ccrotidai and Bovidce.'] 
Sclater, W. L. [See Muridce , Dipodidce, and Artiodactyla . ] 
Scott, W. B. [See Cotylopidce.'] 
, & Osborn, H. F. Preliminary Account of the Fossil Mammals 
from the White River and Loup-Fork Formations, contained in the 
Museum of Comparative Zoology. Part II. Bull. Mus. C. Z. xx, 
pp. 65-100, 3 pis., woodcuts. 
A valuable memoir, reviewing and completing the work done on the 
Carnivora, Artiodactyla and Perissodactyla ; the two first groups being 
described by Scott, and the third by Osborn. In the Carnivora , the first 
section is devoted to AElurodon, from which it is considered that 
Schlosser’s Prohyaena (misquoted Palhycena) is inseparable. In the 
Felidae a humerus is provisionally ascribed to a large species of Felis , 
under the name of F. maxima ; the reason for referring it to that genus 
rather than to Machcerodus ( Smilodon ), being the presence of an entepi- 
condylar foramen, which is absent in M. (S.) necator. In the Artiodactyla, 
Merychyas is shown to differ from other Creodonts by having the fdurth 
upper milk-molar with four crescents, like that of the Pecora , whereas 
in most other members of the family it is triangular, as in the Tragulina. 
The foot-structure is also of the “adaptive” type. Merycochcerus has a 
similar type of foot. Important observations are made on the skeletons 
and general structure of Blastomeryx and Cosoryx, which are shown to be 
true Ruminants, and are referred to the family Gelocidce. The former is 
shown to be closely allied to Palceomeryx , from which it is mainly dis- 
tinguished by the absence of the characteristic fold in the lower molars. 
It was probably an ancestor of the true American Deer. Cosoryx is 
regarded as very closely allied to Blastomeryx , but has a more hypsodont 
dentition and forked antlers, which were probably not deciduous, and 
covered with skin. Cope’s suggestion that Cosoryx may have given rise 
to Antilocapra is considered probable, since the forked horn-sheaths of 
