432 BibliograpMcal Notices. 



II, Nei') Genera and Species from the Belhf -River Series 

 (Mid- Cretaceous). By Lawrence M. Lambe. 



The history of geological research by the Canadian Surveyors in 

 the Belly-River district is explained at pp. 25-28, and then, at 

 pp. 28-81, detailed descriptions are given of five fishes, one batra- 

 chiau, twenty-six reptiles, and three mammals — altogether thirty- 

 four, of which eleven are new. There are two short comparative 

 tables of generic features of Monoclonius and Polyonax at p. 68 

 and specific of Tracliyodon and Pteropelyx at p. 77. 



The Evolution of the Northern Part of the Lowlands of South-eastern 

 Missouri. By C. F. Maebctt, Professor of Geology. Pp. vii & 63 ; 

 7 plates of views and maps. 8vo. Published by the University 

 of Missouri. 1902. 



This memoir belongs to vol. i. of ' The University of Missouri 

 Studies.' It is very properly directed to the description and 

 explanation of a portion of the State itself. This south-eastern 

 part abuts on the western bank of the Mississippi below its 

 junction with the Missouri River and above that with the Ohio. 

 The northern part of the area is occupied by belts of low lands and 

 ridges of no great height ; it is limited on the west by the Ozark 

 limestone-range. The relative levels and breadths are very carefully 

 recorded, and their surface-characters are indicated by a few photo- 

 graphs in plates i. and ii. ; and pi. iii. gives an admirable view of a 

 crowded, melancholy, water-logged cypress-swamp. To show how 

 the natural drainage of the country is traceable through its many 

 changes, by the silting and banking-up of the rivers and the changes 

 of their channels, is the object of the author, who, with his friends, 

 has taken great pains to show that the Mississippi is now occupying 

 its third successive channel, having been modified more than once 

 by its junction with the Ohio River. Necessarily the relative hard- 

 ness and softness of the strata composing the district have been 

 important factors in this history, and so also has been from time to 

 time the influx of water at the close of glacial periods. The 

 Trenton Limestone (Lower Silurian) is at the base, constituting also 

 the flanking Ozark territory, and seen in the bed of the Mississippi 

 (pi. ii.). After the period of this being uplifted and eroded. Tertiary 

 strata, as clay (Idalia), sands (Benton), and gravels (Princeton), came 

 to be deposited there ; and after a while the valley-deposits, namely, 

 the Lafayette sands and gravels, the Loess, and the Terrace loam. 

 The local distribution of all of these is shown by the map pi. vii. 



