282 RECORD OF SCIENCE FOR 1886. 



White, Charles A. — Coutiuued. 



one horizon to another, even as certain fresh- water species are now known 

 to have passed from the Laramie up into the Wasatch group. The char- 

 acter of the strata in which these fresh-water Jurassic fossils were found, 

 both at the Colorado and Wyoming localities, in addition to the character 

 of the fossils themselves, is such as to indicate for them a lacustrine and 

 not an estuary or fluviatile origin. If the strata at both localities really 

 contain an identical fauna, it may be regarded as i)robable that they were 

 deposited in the same lake. The distance between the Colorado and the 

 Wyoming localities indicates that the supposed lake was nearly 200 miles 

 across ; and if the Black Hills fossils also belonged to the same contempora- 

 neous fauna, the assumed lake was much larger. 

 Indeed in view of the evidence we have (derived from both the vertebrate and 

 invertebrate fossils) of the existing continental conditions and in view of 

 the limited extent of recognized marine Jurassic deposits in North America 

 and the doubtful age of some of the deposits which have teen referred to 

 that period, one can not say with confidence that any considerable part of 

 the present North American continent was beneath the sea during any por- 

 tion of the Jurassic period. In conclusion the author thinks it may be 

 safely assumed that the great inland portion of our continent was not so 

 permanently the seat of oceanic waters during Mesozoic time as has been 

 supposed. 

 A synopsis and figures of all the known fresh-water fossils which have been 

 discovered in the Jurassic rocks of North America is given, and the follow 

 ing new species are described : Unio Fclehii, U. toxonofus, U. macroplsthus, 

 U. iridoides, U. lapilloides, Limncea ativuneula, L. consortls, L. ? accelerata, 

 Vorlicifex Slearusu. 



White, Charles A. On the Relation of the Laramie Molluscan 

 Fauna to that of the succeeding Fresh- Water Eocene and other groups. 

 (Bull. U. S. Geol. Survey, No. 34, pp. 1-35, pis, i-v, 1886. Wash- 

 ington.) 



Concludes that the strata in the western portion of our national domain form 

 one uninterrupted scries froiu the lowest of the marine Cretaceous forma- 

 tions to the top of the Bridger group, the uppermost of the fresh- water 

 Eocene series, inclusive, both on account of the stratigr.iphical relations 

 and the character and distribution of the fossil contents of the respective 

 groups of strata. 



The author gives a table showing the range of the species collected at the 

 Wales locality on the western side of the San Pete Valley, with the addi- 

 tion of the Helix awl Pupa obtained by Professor Cope from his Puerco 

 group in New Mexico. 



The new species described are the following: Unio rectoides, Acella microneina, 

 Physa hnllata, Acroloxits actinophonifi, Helix nacimientensis, H. adipis, Gonio- 

 hasis filifera, Vivipnrns nanus, and Cypris sanpetensis. 



White, Charles A. {See Koenen von ; Steininann). 

 Whiteaves, J. F. {See Bailey, L. W. ; G. J. Hinde). 



Whitfield, Egbert Pare. Fossil Scorpion from American Rocks, 

 and other fossils. Bulletin No. 6 (vol. i), American Museum of Nat- 

 ural History. (Amer. Jour. Sci., 3d ser., vol. xxxi, pp. 228, 229, 

 March, 1886. New Haven.) 

 Abstract of 



