Trans. N. Y. Ac. Sci. 34 Dec. lo, 



2. Spiraxis Randalli, n. sp. 



Body fusiform ; three or four inches in length, by six to eight lines 

 in diameter ; surface marked by two revolving and closely approxi- 

 mated ridges, which below are broad and flattened or rounded, and 

 separated by narrow furrows, above acute and narrow, and separated 

 by greater intervals. 



From S. majo7- this species may be distinguished by its smaller size, 

 its somewhat curved or sinuous outline, and the closer approximation 

 of the raised ridges, which are also more flattened and relatively 

 broader. 



December lo, 1883. 



Section of Geology. 



The President, Dr. J. S. Newberry, in the Chair. 



One hundred and forty five persons were present. 



The President exhibited fine specimens of terminated crystals 

 of black tourmaline from Jefferson, St. Lawrence County, N. Y., 

 somewhat similar to those which are found at Monroe, Conn.; 

 also some large specimens of moss agate from Brazil, and re- 

 marked on their mode of formation. The resignation of Dr. 

 HiGGiNs, from resident membership, was read and accepted. 



Dr. J. S. Newberry and Prof. H. L. Fairchild then presented 

 a joint paper, illustrated with a large series of original lantern 

 views and by specimens, on 



THE geology, botany, AND SCENERY OF THE YELLOWSTONE 



NATIONAL PARK. 



December 17, 1883. 

 Section of Chemistry. 



The President, Dr. J. S. Newberry, in the Chair. 



Sixteen persons present. 



Dr. Newberry exhibited a specimen of fossil fish from Wyoming, 

 presenting an interesting character of dentition ; also a series of 

 maps of the surveys of the route of the Northern Pacific Railroad. 



The following papers were then read by Prof. Albert R. 

 Leeds : 



L The Literature of Ozone and Peroxide of Hydrogen 

 (second memoir), published in the Annals, vol. III., and including — 



I. Historical-critical resume of the progress of discovery since 



1879. 



