Monthly Author's Catalogue. 121 
RIGGS, E. S. 
Structure and relationships of the opisthocoelian dinosaurs. 
Part II. The Brachiosauridae. (Field Col. Mus., Geol. Ser., vol. 2, 
No. 6, pp. 329-347, Sept., 1&04.) 
RU88ELL, I. C. 
The Influence of caverns on topography. (Science, vol. 21, p. 
20, Jan. 6, 1905.J 
SALISBURY, R. D. 
Three new physiographic terms. (Jour. Geol., vol. 12, pp. TOT- 
TIG, Xov.-Dec, 1904.) 
8HATTUCK, G. B. 
Development of knowledge concerning the physical features of 
Cecil county, with bibliography. QIar. Geol. Sur., Cecil county, 
pp. 31-62.) 
SHATTUCK, G. B. 
The Physiography of Cecil county. (Mar. Geol. Sur., Cecil 
County, pp. (J-i-^2.) 
SHATTUCK, G. B. 
The Miocene deposits of Maryland; Geological and Paleonto- 
loglcal relations with a review of earlier investigations. (Mar. 
CJeol. Sur., Miocene, pp. xxxiii-cxxviiL) 
SHATTUCK, G. B. 
The Geolog>- of the coastal plain formations. (Mar. Geol. Sur., 
Cecil county, pp. 149-194.) 
SHIMEK, B. 
Fresh-water shells in the loess. [Abstract]. (Bull. G. 9. A., 
vol. 15, p. .5T6.J 
STEVENSON, JOHN J. 
Memoir of J. Peter Lesley. (Bull. G. S. A., vol. 1.5, pp. -522-541, 
portrait.) 
SMITH, G. O, (and F. C. CALKINS), 
A geological reconnoissance across the Cascade range near the 
forty-ninth parallel. (Bull. 235, U. S. G. S.. pp. 103, 1904.) 
SPENCER, J. W. 
Submarine great canyon of the Hudson river. (Am. Jour. Sci., 
vol. 19, Jan., 1905, pp. 1-16.) 
STRUTHERS, JOS. 
Aluminum and Bauxite. (Min. Res. U. S., 1903, pp. 265-281.) 
STRUTHERS, JOS. 
Antimony and Arsenic. (Min. Res. U. S., 1903, pp. 31T-335.) 
STRUTHERS. JOS. (and J. H. PRATT). 
Tin. (Min. Res. U. S., 1903, pp. 33^351.) 
SWANK, JAMES M. 
Statistics of the American iron trade for 1903. (Min. Res. U. 
S., 1903. pp. T5-129.) 
TAFF, J. A. 
Preliminary report on the Geology of the Arbuckle and Wichita 
moim tains in Indian Territorv and Oklahoma. (Prof. Pap., U. S. 
G. S., No. 31, 1904.) 
