11 
characters of the intestinal tract in the different Mammalian 
groups, and concluded with the inferences as to the affinities of 
these groups that the patterns supplied. 
Lieut.-Col.C. Deumé-Rancuirrs, M.V.O., ¥.Z.S., gave an account, 
illustrated by a fine collection of specimens anda series of lantern- 
slides, of the Natural History of Western Uganda, deduced from 
observations and collections made by him while acting as British 
Boundary Commissioner on the Uganda frontiers. 
Dr. H. Gavow, F.R.S., read a paper on the Distribution of 
Mexican Amphibia and Reptilia. After a critical revision of the 
species recorded from Mexico, the Author stated that he grouped 
them according to the prevailing physical features of the country. 
It was found that Mexico had received its present fauna from both 
the Northern and the Southern Continents. The Northern 
immigrants had spread over high tablelands and mountains, whilst 
not a few species had descended into the hot lowlands, even into 
Central America and still further south. On the other hand, the 
Southerners were divided by the plateau into an Atlantic and a 
Pacific mass, each having had time to modify many of its members 
according to the very different physical features. Scarcely any of 
these Southerners had ascended the plateau, but they were not 
averse to ascending high outlying mountains. A comparative 
list of species confined to high altitudes was given, and the con- 
clusion arrived at, with the help of geological data and the fauna 
of the Antilles, was that the exchange between the North and 
South took place during the Miocene epoch, at which period alone 
the Antilles were connected with Central America. 
Mr. G. A. Bounnncer, F.R.S., described the new species of 
Reptiles discovered in Mexico by Dr. H. Gadow. 
Mr. G. A. BouLENGER also presented a paper containing an 
account of the Batrachians and Reptiles collected in South Africa 
by Mr. C. H. B. Grant and presented to the British Museum by 
Mr. C. D. Rudd. 
Mr. F. E. Bepparp, F.R.S., communicated some notes on the 
Anatomy of the Yellow-throated Lizard, Gerrhosaurus flavigularis. 
Mr. BEDDARD also presented notes on the Cerebellum in the 
Exanthematic Monitor, Varanus exanthematicus, and on the 
Cerebral Hemispheres in the Taraguira Lizard, Tropidurus 
hispidus. 
Mr. Ricuarp AssHEton, F.Z.8., communicated a paper on the 
Foetus and Placenta of the Spiny Mouse, dAcomys cahirinus. 
The paper pointed out that the foetus, received from the Society’s 
Gardens, was covered by a thin epitrichium which was. perforated 
