Geology and Natural History. 85 



by a map and fifty-seven structural illustrations ; Prof. N. H. 

 Wi^chell, on the iron ore of Minnesota ; and by Aug. E. 

 Foerste, notes on four species of Illaeni. Besides the valuable 

 notes and discussions connected with the iron ores, there is a 

 large amount of facts bearing on the relations of granite and the 

 associated schistose rocks, (gneiss and mica and hydromica 

 schist), which go far in the way of elucidating the conditions of ori- 

 gin of granite and the associated schists. The accompanying fig- 

 ures are highly instructive. There is much in the report which 

 geologists will find it profitable to study. 



8. New York Paleontology : Vol. VI, Corals and Bryozoa, 

 containing descriptions and figures of species from the Lower 

 Helderberg, Upper Helderberg and Hamilton Groups,' by James 

 Hall, State Geologist and Paleontologist, assisted by George 

 B. Simpson". 298 pp. 8vo, with sixty-seven lithographic plates. 

 Prof. Hall has here added another to the long series of volumes 

 on the Paleontology of New York. The number of species de- 

 scribed is 371, and of these 328 are figured on the plates. Prof. 

 Hall states, in his prefatory remarks, that about 100 additional 

 species he has studied and had drawn, which he could not acid to 

 the present volume on account of the restriction limiting its ex- 

 tent. The illustrations of the species are beautiful, and the vol- 

 ume a great contribution to paleozoic paleontology and espe- 

 cially to the department of Bryozoans. 



9. Annual Report of the Geological Survey of Pennsylvania, 

 for 1886, by the State Geologist. 574 pp. 8vo. — This volume, 

 Part 1 of the report, treats of the Pittsburgh Coal Region, and has 

 been prepared as regards the geological structure, by E. V. 

 d'lnvilliers ; the general mining methods of the Pittsburgh Coal 

 Region, by Selwyn Taylor ; the mining methods practised by 

 Westmoreland Coal Co., Irwin, Pa., by A. N. Humphreys, 

 Engineer ; and the character and distribution of Pennsylvania 

 plants, by L. Lesquereux. The subjects of the other parts yet to 

 be issued, are : II, Oil and Gas region ; III, Anthracite Coal 

 region ; IV, Miscellaneous Reports. A large colored geological 

 map of Southwest Pennsylvania, with special reference to the 

 Pittsburgh Coal bed, accompanies the report. 



10. Fossil Mammals from the White River formation contained 

 in the Museum of Comparative Zoology. Bull. Mus. Comp. 

 Zool., xiii, No. 5, 1887. — Messrs. W. B. Scott and H. F. Osborn 

 here present an abstract of a detailed memoir in course of prepa- 

 ration. Besides a number of species first described by Dr. Leidy, 

 there are here included notices of the new species Hyainodon 

 leptocephalus Scott, Hyotherium americanum, Menodus ticho- 

 ceras, M. dolichoceras, M. platyceras, and a restoration of M. 

 Proutii ( Titanotherium) on plate II ; Metamynodon planifrons, 

 Hyracodon major, H. planiceps. Plate I gives a restoration of 

 Hoplophoneus (Drepanodon) primcevus Leidy, one-fourth the 

 natural size. Many wood-cuts also illustrate the paper. 



