Geological Society. 551 



U.S. Department of AgrtcuUnre : Bureau of Biohirpcal Sitrvei/. 

 North American Fauna, No. 31 (Oct. 19, 1910). lievision of the 

 Wooil Hats of the Genus Xeotoma. By Edward A. Goldman, Field 

 Naturalist, Biological Survey. Prepared under the direction of 

 Hexky W. Henshaw, Chief of Bureau of Biological Survey. Wash- 

 ington. Pp. 107 ; pl3. 8 and 14 illustrations in the text. 



The present monograph includes 70 species, divided into 3 sub- 

 genera — Xeotoma, Uomodontomys, and Teonoma ; a tew forms are 

 here described as new. These rats are confined to North and Central 

 America, and are most numerous in thewest and south ; in the Hudson 

 Bay Region and the upper part of the Mississippi Valley they are 

 absent. An interesting account is given of their habits, and they 

 are sometimes destructive to crops, and especially to stored grain, 

 as well as to various shrubs ; in Mexico some species are used for 

 food by the inhabitants. In California it has lately been discovered 

 that they are liable to become infected with plague. 



PROCEEDINGS OP LEARNED SOCIETIES. 



GEOLOGICAL SOCIETY. 



March 22nd, 1911.— Prof. W. W. Watts, Sc.D., M.Sc, F.R.S., 

 President, in the Chair. 



The following communications were read : — 



1. 'On Some Mammalian Teeth from the Wealden of Hastings.* 

 By Arthur Smith Woodward, LL.D., F.R.S., F.L.S., Sec.G.S. 



Mr. Charles Dawson, F.S.A., F.G.S., has obtained two imperfect 

 molars, apparently of PlagiauJax, from beds of grit in the A\'eulden 

 near Hastings; and his associates in the work of exploration, 

 Messrs. P. Teilhard de Chardin and Felix Pelletier, have found a 

 well-preserved multituberculate molar of the form named Dij^iriodon 

 by Marsh. These specimens are described. 



2. 'Faunal Horizons in the Bristol Coalfield.' By Herbert 

 Bolton, F.R.S.E., F.G.S., Curator of the Bristol Natural History 

 Museum. 



The Author has been engaged for three years in (he examination 

 of the Coal Measures of the Bristol Coalfield, and has determined 



