Authors'' Catalogue. 189 
Spurr, J. E. 
The Kuskokwim drainage area. (Maps and Desc. Routes in Alaska, 
1898; U. S. Geol. Surv., 1899.) 
Spurr, J. E. 
From the Yukon mouth to Point Barrow. (Maps and Desc. Routes 
in Alaska, 1898; U. S. Geol. Surv., 1899.J 
Spurr, J. E. 
The Kowak river. (Maps and Desc. Routes in Alaska, 1898; U. S. 
Geol. Surv., 1899.) 
Stewart, Alban. 
Leptichthys, a new genus of fishes from the Cretaceous of Kansas. 
(Am. Geol., vol. 24, p. 78, Aug., 1899.) 
Stewart, Alban. 
Notice of three new Cretaceous fishes, with remarks on the Sauro- 
dontidae. Cope. (Kans. Univ. Quart., vol. 8, July, 1899.) 
Stewart, Alban. 
Notes on the osteology of Anogmius polymicrodus Stewart. (Kans. 
Univ. Quart., vol. 8, July, 1899, plate 31.) 
Todd, J. E. 
New light on the drift in South Dakota. (Proc. Iowa Acad. Sci. vol. 
6, pp. 122-130, 1898 [1899].) 
Udden, J. A. 
The Pine Creek conglomerate. (Proc. Iowa Acad. Sci., vol. 6, pp. 54- 
56, 1898 [1899].) 
Udden, J. A. 
Diatomaceous earth in Muscatine county. (Proc. Iowa Acad. Sci., 
vol. 6, p. 53, 1898 [1899].) 
Upham, Warren. 
Glacial History of the New England islands. Cape Cod and Long 
Island. (Am. Geol., vol. 24, pp. 79-92, Aug., 1899.) 
Walcott, C. D. 
Maps and descriptions of routes of explorationin Alaska in 1898, with 
general information concerning the territory. Prepared in accordance 
with public resolution No. 25, of the fifty-fifth congress, third session, 
approved March ist, 1899. Ten maps in an accompanying envelope. 
Octavo, pp. 138. (U. S. Geol. Survey, 1899.) With special reports of 
expeditions. 
Williams, H. S. 
Devonian interval in northern Arkansas. (Am. Jour. Sci., vol. 7, pp. 
139-153. Aug., 1899.) 
Williston, S. W. 
A new genus of fishes from the Niobrara Cretaceous. (Kans. Univ. 
Quart., vol. 8, July, 1899, plate 26.) 
Witter, F. M. 
Observations on the geology of Steamboat Springs, Colorado. (Proc. 
Iowa Acad. Sci., vol. 6, pp. 93- 98, 1898 [1899].) 
