Author's Catalogue. 187 
OSBORN, H. F. (and WALTER GRANGER). 
Fore and hind limbs of Sauropoda, from the Bone Cabin quarry. 
(Bull. Am. Mus. Nat. Hist., vol. 14, pp. 199-209. Dec., 1901.) 
PENFIELD, S. L. (H. L. WELLS and). 
New occurrence of sperrylite (Am. Jour. Sci., vol. 138, Feb. 1902, 
pp. 95-96.) 
PERKINS, GEO. H. 
Sketch of the life of Zadock Thompson | Portrait]. (Am. Geol. 
vol. 29. pp. 6-71. Feb., 1902. 
- SAFFORD, J. M. 
Classification of the geological formations of Tennesee. (Bull. 
G. S. A., vol. 13. pp. 10-14, 1901.) 
SAFFORD, J. M. 
Horizons of phosphate rock in Tennessee. (Bull. G. S. A., vol. 
13, pp. 14-15, Dec., 1901.) 
SMYTH, C. H., JR. 
Geology of the crystalline rocks near the St. Lawrence river. (53 
Ann. Rep. N. Y. State Mus., pp. 83-104, Albany, 1901.) 
VAN HISE, C. R. 
Geological excursion in Colorado. (Bull. G. S. A. vol. 13, pp. 2-5. 
Dec., 1901.) 
VERY, F. W. 
A cosmic cycle. Il. (Am. Jour. Sci., vol. 13, pp.98-114. Feb., 1992.) 
WELLS, H. L. (and S. L. PENFIELD). 
New occurrence of sperrylite. (Am. Jour. Sci., vol. 13. Feb., 1902. 
pp. 95-96.) 
WHITFIELD, R. P. 
Note on a very fine example of Helicoceras stevensoni, preserv- 
ing the outer chamber. (Bull. Am. Mus. Nat. Hist .vol. 14. pp. 219- 
221. pls. 29 and 30. Dec.. 1901.) 
WHITFIELD, R. P. 
Description of a new Teredo-like shell from the Laramie group 
(Bull. Am. Mus. Nat. Hist., vol. 16, pp. 73-76, Feb., 1902. ph. 28 
and 29.) 
WHITFIELD, R. P. ; 
Description of a new form of Myalina from the coal measures 
of Texas. (Bull. Am. Mus. Nat. Hist., vol. 16, pp. 63-66. Feb. 5, 
1902.) 
WHITFIELD, R P. 
Observations on and emended description of Heteroceras sim- 
plicostatum Whitfield. (Bull. Am. Mus. Nat. Hist., vol. 16, pp. 67-72, 
pp. 23-27. Feb. 5, 1902.) 
