TITLES. 
Mamm. 13 
Major, C. J. Forsyth. On some Miocene Squirrels, with Remarks on 
the Dentition and Classification of the Sciurinm. P. Zool. Soc. 
London, 1893, pp. 179-215, pis. viii-xi. 
After an elaborate review of the dentition of recent Squirrels, and the 
classification of the group, together with a description of certain fossil 
forms, the author proceeds to give his reasons for rejecting the view 
that trituberculism is the primitive type of Eutherian molar denti- 
tion. On the contrary, he regards the primitive condition as that of 
polybunism. The single tubercles of cusps in the primitive type are 
considered to have been arranged in longitudinal series (tinotaxis), 
divided by longitudinal grooves, or valleys, there being generally three 
rows, with two grooves in the upper, and two rows, with one groove, in 
the lower molars. Microlestes may prove to have been a remote ancestor 
of the Eutheria. From the polybunic molar it is considered that the 
other types of Placental cheek-teeth have originated by a gradual trans- 
formation of the longitudinal arrangement of the cusps into a transverse 
ono (chiastotaxis), and the dominant dovclopmont of a limited number, 
as well as by the fusion and suppression of others, although certain of 
these persist in a secondary condition with great constancy. In the upper 
molars two cusps on the outer side, and either one or two on the inner 
side are the most developed. The typical tritubercular molar is a 
specialized stage, frequently preceded by the trigonodont type of Riiti- 
meyer. The supposition that the talon or heel of the lower molars is a 
superadded element, is disputed ; but it cannot yet be determined which 
of all the cusps of the primitive polybunic molar represents the simple 
conical Reptilian tooth. [See p. 29, Sciuridcc.'] 
. On Megaladapis Madagascar ietisis, an Extinct Gigantic Lemuroid 
from Madagascar. P. R. Soc. Londou, liv, pp. 176-179. [See p. 26, 
Mega ladapidce. ] 
. On a Subfossil Lemuroid Skull from Madagascar. P. Zool. Soc. 
London, 1893, pp. 532-535. [See p. 26, Lemuridce.] 
Marsh, 0. C. Description of Miocene Mammalia. Amer. J. Sci. (3) 
xlvi, pp. 407-412, pis. vii-x. 
Describes and figures remains of Protoceras , Elotherium , Ammodon , 
PercJicerus, Colodon, and Rhinoceros. [See p. 38, Chceropotamidce.'] 
. Restoration of Coryphodon. T. c. pp. 321-326, pis. v & vi, and . 
Geol. Mag. (3) x, pp. 481-487, pi. xviii. 
. Restoration of Mastodon americanus y Cuvier. Geol. Mag. (3) x, 
p. 164, pi. viii. 
Reprint of a paper quoted in Zool. Rec. xxix. 
Matschie, — . Ueber die weissnasigen Meerkatzen. SB. Ges. naturf. 
Berlin, 1893, pp. 94-101. 
Gives a descriptive list of the various white-nosed species of Cercopi- 
thecus. 
