Review of Uecent Geological Literature. 109 
itobenslsi, Loricula canadense (cirripede) and two selachian tishes 
Ftychodus parvulus, Lamna manitobensis. 
The work is beautifully illustrated with fifteen plates of sixty-three 
species. 
On the form and position of the sea level, with special reference to its 
dependence on superficial masses sy metrically disposed about a normal to 
the earth's surface. By Robert Simpson Woodward, pp. 88. (Bulle- 
tin of the U. S. Geological Survey, No. 48, 1888). The mathematical 
investigation here reported deals with the influence on the level of the 
sea or of lakes exerted through gravitation by such masses as the ice- 
sheet of the Glacial period, or in a lake basin by the water itself. Its 
application in the present work of the national survey is to determine 
the amount of displacement or variation from the present level which 
would be thus accounted for in the shore lines of the Quaternary lakes 
Bonneville and Lahontan of the glacial lake Agassiz and the higher 
stages of the Laurentian lakes, held in on the north and northeast by 
the recedipg ice-sheet, and of the ocean, which submerged the north- 
ern borders of this continent and of Europe at the clo.se of the Glacial 
period. The previous discussions of this subject by Pratt, Heath and 
Thomson are reviewed ; and the formulas deduced for ice attraction are 
employed in a consideration of the variations in sea level attributable 
to continental masses. 
The next two in this series of bulletins are by the same author : No. 
49. Latitudes and longitudes of certain points in Missouri, Kansas mid 
New Mexico, (pp. 133, 1889), consisting chiefly of instrumental obser- 
vations and their computation ; and No. 50. Formulas and tables to 
facilitate the construction and iise of maps (pp. 124, 1889). 
On invertebrate fossils from tlie Pacific Coast. By Charles A. White. 
pp. 102; plates 14. (Bulletin of the U. S. Geol. Survey, No. 51, 1889). 
Part I of this memoir describes nineteen new species and one new 
genus of fossil mollusca from the Chico-Tejon series of California. 
This series, which comprises the Chico, Martinez, and Tejon groups 
of the California Geological Survey, is found to be one great continu- 
ous succession of marine strata, unbroken from base to top, though 
representing both the closing epoch of the Cretaceous period and the 
opening one of the Tertiary. "During this time," writes Dr. White, 
"attendant physical conditions produced no sudden changes in the 
aqueous life of the waters in which the deposits occurred. * * * * 
The Cretaceous characteristics gradually disappear upward leaving 
the surrounding fauna, with its later accessions, without any com- 
mingling of Cretaceous types." These features present a marked 
contrast with the probably contemporaneous brackish and fresh-water 
Laramie formation of the interior of the continent, which, although 
doubtless continuously deposited from the marine Cretaceous beneath 
it, and into the fresh-water Tertiary deposits above it, yet exhibits, 
because of surrounding physical changes, an abrupt accession of its 
