N. A. INVERTEBRATE PALAEONTOLOGY. 753 



White, C. A. — Xotes on the Jurassic Strata of North America. Na- 

 ture, vol. XXXI, p. 522. 1885. Loudon and New York. 



(Notice and abstract of Dr. White's article in the Amer. Journ. tSci- 

 ence.) 



White, C. A. — The Genus Pyrgulifera, Meek, and its Associates and 

 Congeners. Ainer. Journ. ScL, 3d ser., vol. xxix, pp. 277-280. April, 

 1885. New Haven. 



Calls attention to the probable identity of the genus Pyrgulifera of 

 the Bear Kiver group of North America, the fresh- water Upper Creta- 

 ceous of Hungary, and the living shells in Lake Tanganyika. Dr. Leo- 

 pold Tausch considers that he has found the type species, P. humerora, 

 in Hungary. This wide extensive range of fresh or brackish water 

 forms, both in time and space, is very difficult to understand and ex- 

 plain, and has also an extreme interest in relation to the assumed equiv- 

 alency of formations which bear similar faunas. 



White, 0. A. — (The Genus Pyrgulifera, Meek, and its Associates and 

 Congeners.) Nature, vol. xxxii, p. 68. 1885. London and New 

 York. 



Notice and abstract of Dr. White's paper in the Amer. Journ. Science. 



White, C. A. — On the Mesozoic and Cenozoic Palaeontology of Califor- 

 nia. Bull. U. S. Geol. Survey, No. 15, pp. 1-33. 1885. Washington. 



The author considers that the Chico-Tejon groups are an unbroken 

 series of strata, and together represent the closing epoch of the Creta- 

 ceous and the opening or Eocene epoch of the Tertiary. The unbroken 

 continuity of the series is best illustrated near New Idria, Fresno County; 

 still, there is there, near the middle, a recognizable change in the aspect 

 of the strata, so that in appearance, and to some extent in the character, 

 of the stratification the upper half differs from the lower half. 



In the Shasta group Dr. White considers the Knoxville beds as older 

 than the Horsetown beds. The Cretaceous of British Columbia and 

 Alaska he considers as probably the equivalent of the Knoxville beds. 

 This conclusion is based on the occurrence of Aucella. The author 

 considers Aucella erringtonii and A. piocJdi Gabb as identical, and as 

 varieties of Aucella concentrica Fischer, and on this account considers 

 the so-called Jurassic auriferous slate as of the same age as the Knox- 

 ville beds of the Shasta group, and considers the existence of the Ju- 

 rassic in California as very doubtful. The fauna of the Knoxville beds 

 of the Shasta group extends from Alaska southward at least as far as 

 Central California. Some fossils from Southern Mexico apparently come 

 from strata of the same age. No rocks of that age are known to exist to 

 the eastward of the probable site of that belt ; and, finally, the Jurassic 

 fauna of the strata which lie to the eastward of the assumed site of the 

 belt is entirely different from that of the Jurassic strata to the west- 

 ward of it. The author throws out the Martinez group and considers 

 H. Mis. 15 48 



