754 SCIENTIFIC RECOKD FOE 1885. 



that there is an uii1)roken stratigraphical aud fauna! continuity from 

 the Cretaceous to the Tertiary in the Chico-Tejon series. The Shasta 

 group is divided into two divisions, the Knoxville beds aud the Horse- 

 town. The latter probably represents the Gault and the former the 

 Lower I^eocomian, and there is probably a hiatus between these two 

 divisions. The Knoxville beds are regarded as having been synchron- 

 ously deposited with the Aucella-hesirmg strata which have been found 

 at various points along the northwest coast of i^orth America, and also 

 as homotaxially equivalent with those which in Northern Europe and 

 Asia bear the same species of Aucella. 



No species of fossils yet found in the California Cretaceous rocks 

 have been satisfactorily identified with any which occur in strata to the 

 eastward of the Sierra Nevada. The reasons for this view are given in 

 detail in the form of remarks on each specific identification. 



This difference in fauna is believed to have been due to the presence 

 of a comparatively narrow but long continental belt which existed in 

 the region which now comprises that of the Pacific coast, continuing 

 from a time at least as early as the earliest epoch of the Cretaceous 

 period. 



White, C. A. — On Marine Eocene, Fresh- water Eocene, and other 

 Fossil Mollusca of Western North America. Bull. U. S. Geol. Survey, 

 No. 18, pp. 1-26, pis. i-iii, figs. 1-3 on p. 19. 1885. Washington. 

 This article is divided into several parts, as follows : 



(1) The occurrence of G ardita planieosta Jjstmarck in Western Oregon. 



(2) Fossil mollusca from the John Day group in Eastern Oregon. 

 These fossils not only all belong to the types which are now living in 

 or near the same region where the fossil forms are found, but a part of 

 the latter are so nearly like the species that the author has not thought 

 it advisable to separate them. The species are all different from auy 

 that have been hitherto known in a fossil's condition. The new species, 

 Unio condoni, is described, and the description of Helix {Monodon) dullii 

 is given from Dr. E.. E, C. Stearns's manuscript. 



(3) Supplementary notes on the non-marine fossil mollusca of North 

 America. Some additions and corrections for the illustrations on page 

 19 are made to the above work. 



White, C. A. — On new Creta.ceous Fossils from California. Bull. U. S. 

 Geological Survey, No. 22, pp. 1-25, pis. i-v. 1885. Washington. 



The author regards the Todos Santos Bay locality, upon palaeonto- 

 logic grounds, as equivalent with the Wallala beds, which Dr. Becker 

 considers similar to the Chico group. Dr. White thinks they probably 

 (Occupy a position between the Chico and Shasta groups. At Wallala, 

 Mendocino County, Dr. Becker found the strata several thousand feet 

 thick, restiug upon a metamorphic series which he believes to be equiva- 

 lent with the Knoxville beds of the Shasta group, but he was unable to 

 discover any contact with the strata above them. The character of the 



