160 The American Naturalist. [February, 



line along which an uplift of much greater age than the first one lias 

 taken place, runs near the western shore of the peninsula. This line 

 i- indicated by several short ranges mostly composed of crystalline 

 schists and granite. It is probable that the mesa sandstones have been 

 derived from this older area by erosion. (Proceeds. Cal. Acad. Sci. 

 vol. III. Pt. 1.)— Dr. Lydekker has recently published a summary of 

 the present state of knowledge of the Fossil Birds found in Great 

 Britain. He has embodied in this summary brief descriptions of typi- 

 cal specimens, pointing out some of the more striking features by 

 which particular bones of certain groups may be recognized. The 

 total number of species recorded in various collections is slightly over 

 60. This includes, however, birds of the superficial deposits, many el 

 which belong to existing species; the list of extinct forms admitted «| 

 valid, falls short of 20. 



Paleozoic. — Contributions to the Micro-Pakeontology, Part III, 

 has recently been published by the Geological Survey of Canada. It 

 consists of a report on Ostracoda from the Cambro-Silurian, Silurian. 

 and Devonian rocks at various localities in the Dominion by Prof. 

 Rupert T. Jones, with a critical note on the species described by him 

 in 1858. It contains forty-one pages of letter press, illustrated by fcwp 



full page lithographic plates and five wood cuts. W. B. Dwight 



has recently found a fossilifcrous stratum of the I'nradoxides zone at 

 Stissing, New York. The species collected consists of Leperditia el?- 

 nina, Kutorgina stissingemis, Olenoides stissing ensis, all undescribed, 



and a Hyolithes, probably " Billingsii." Four new Silurian fossils 



have been described by Mr. Whiteaves; Srophomena acanthoptera, 

 Pentamerus decussahis, Gomphoceras parvidum, and Aridatpi* perar- 

 mata. The fossils are the characteristic ones of an area of Silurian 

 rocks discovered by Mr. J. B. Tyrrell on the Northeast side of Lake 

 Winnipegosis, on Cedar Lake, and on the Saskatchewan River betafj 

 Cedar Lake. (Can. Rec. Sci., April, 1891.) 



Cenozoic— The frontlet and horn-cores of an antelope discovered 

 by Dr. Leeson in the Plistocene deposits near Twickenham have been 

 identified by A. Smith Woodward as those of Saiga tatarica. The 

 remains of Saiga have been found in Fiance and Belgium, but until 

 now there has been no evidence of the occurrence of this animal in 



