50 abstracts: mammalogy 



Williston. It is of interest because the rocks of North Dakota in general 

 lie nearly flat, and because an artesian well drilled a few miles west of 

 the crest of the anticline yields a small flow of gas. The stratigraphy 

 and structure are described, and it is suggested that wells be drilled 

 nearer the crest of the anticline in search of a larger flow of gas. 



R. W. Stone. 



GEOLOGY. — Geology and oil and gas prospects of the Lake Basin field, 

 Montana. E. T. IL\ncock. U. S. Geol. Survey Bull. 691-D. 

 Pp. 101-147, with maps, sections, and illustrations. 1918. 



Describes the Cretaceous and Tertiary stratigraphy of an area north- 

 west of Billings, discusses the structural folds and numerous faults 

 in detail, and recommends that drilling be done in the Big Coulee- 

 Hailstone dome in a search for oil and gas. If that dome proves barren, 

 the possibility that oil and gas occur in commercial quantities in the 

 Lake Basin is believed to be very slight. R. W. Stone. 



MAMMALOGY. — East African mammals in the United States National 

 Mtisetmt. Part. I. Insectivora, Chiroptera, and Carnivora. N. 

 HoLLiSTER. Bulletin 99, United States National Museum. 

 Pages 1-194; 3 text figures; plates 1-55. August 16, 1918. 



This first volume of a bulletin dealing with the extensive collection 

 of East African mammals preserved in the National Museum, to be 

 completed in three parts, consists of a general introduction, brief his- 

 torical account of the collection, a map with a dictionary of localities 

 and annotated lists of specimens of the insectivores, bats, and carni- 

 vores. The collections made by the Smithsonian African expedition 

 under the direction of Col. Theodore Roosevelt, 1909-10, and by the 

 Paul J. Rainey expedition, 1911-12, form the basis of the work, but all 

 specimens from Sudan, Eritrea, Abyssinia, Somaliland, Lado Enclave, 

 Uganda, British East Africa, German East Africa, and Zanzibar, re- 

 ceived by the Museum from any source, are listed. These collections 

 contain 1,833 specimens of mammals of the three orders, representing 

 155 species. There are 64 types. Generic and specific synonymies; 

 type localities and location of type specimens; lists of specimens with 

 critical notes; tables of external, cranial, and dental measurements; 

 and field notes recorded by the collectors are given. The plates illus- 

 trate the skulls of all type specimens. N. H. 



