232 Iteports and Proceedings — 



of Maryland" (ilnd., 1880, vol. xxxii. pp. 20-33); ''IV. On the 

 Occurrence of Nummnlitic Deposits in Florida, and the Association 

 of Nummidites with a Freshwater Fauna " (ibid. 1882, vol. xxxiv. 

 pp. 189-193) ; "V. A Comparison of the Eocene Tertiary Mollusca 

 of the South- Western United States and Western Europe in relation 

 to the Determination of Identical Forms " (ibid. 1879, "vol. xxxi. pp. 

 211-216) ; and " VI. On the Age of the Tejou Kocks of California, 

 and the Occurrence of Ammonitic Kemains in Tertiary Deposits " 

 {ibid. 1882, vol xxxiv. pp. 196-21 4). 



In the first of these Mr. Heilprin collects the essence of the 

 scattered literature of, and summarizes his own investigations upon, 

 the Atlantic and Gulf Territories. The deposits prevail over a 

 zone of 25,200 miles wide, skirting the coast from northern New 

 Jersey to Mexico, augmented by the Floridian peninsula and the 

 Mississippi erabayment. In the north the beds are mainly incolierent 

 sands (siliceous, calcareous, and glauconitic), clays, and marls, 

 while in the south lithification is common, particularly in the older 

 members. In general, strikes are roughly parallel to the coasts, and 

 the gentle dips seaward. Only slight and simple diastrophism has 

 aifected the region since Tertiary deposition was initiated. 



The author's conceptions of stratigraphic sequence and equivalence 

 are expressed in the taxonoraic table, reprinted on p. 231 ; the dis- 

 tribution of the several members recognized is approximately shown 

 on a small scale map. In text and map, Hilgard's doubtful reference 

 of the "Grand Gulf" formation to the Miocene is adopted; but the 

 interesting Pliocene or early Quaternary " Port Hudson " is neglected, 

 as is also the Pliocene (?) " Glass Sand " of New Jersey and Long 

 Island. Identification and correlation are essentially palgeontologic ; 

 the diastrophic and geomorphic phenomena whereby the formations 

 in question must ultimately be coordinated are ignored ; and corre- 

 lation with the western territories is not attempted. 



The scope of the subordinate articles is indicated by their titles. 

 Their substance is incorporated in the general discussion. 



The volume is unfortunately without index or other conspectus of 

 contents than a list of articles, the data for the discussions are 

 predominantly bibliothecal, the style is verbose, and the map is 

 crude ; yet in its assimilative function the leading treatise will prove 

 valuable alike to foreign readers and local investigators. W. J. M. 



IaE:poI^TS j^istjo ^E-oozszEsiDHsra-s. 



I. — Geological Society of London. 



L— March 25, 1885.— Prof. T. G. Bonney, D.Sc, LL.D., F.RS., 

 President, in the Chair. — The following communications were read : 



1. " On the Eelationship of JJlodendron, Lindley and Hutton, to 

 Lepidodendron, Sternberg, Bothrodendron, Lindley and Hutton, 

 Siqillaria, Brongniart, and Bhytidodendron, Boulay." By Eobert 

 Kidston, Esq., F.G S. 



The author commenced by expressing an opinion that the so- 



