The United States National Museum 347 



skeletons of the great extinct Arctic Seacow (Rytina) ; several 

 skeletons of huge Galapagos Tortoises ; and an unrivaled 

 series of bones of the Great Auk. The collection is rich in 

 skulls and skeletons of the various species of porpoises. 



In the Department of Geology the following series and 

 separate objects are pointed out by Doctor George P. Merrill 

 as deserving special mention : 



" i. The Leadville (Colorado) collections of rocks and ores, 

 comprising some three hundred and eighty specimens, illus- 

 trating the work of S. F. Emmons and Whitman Cross. x 



" 2. The Washoe collections, comprising one hundred and 

 ninety-eight specimens as selected and studied by George F. 

 Becker. * 



" 3. The collections of the Fortieth Parallel Survey. These 

 comprise some three thousand specimens of eruptive and sedi- 

 mentary rocks collected by members of the Fortieth Parallel 

 Survey, under the direction of Clarence King, in 1867-73. 

 The eruptive rocks of the series were described by Professor 

 Ferdinand Zirkel. 3 



"4. The Hawes collections. These comprise some three 

 hundred and fifty specimens of eruptive altered rocks, repre- 

 senting in part the work done by Doctor Hawes in connection 

 with the New Hampshire surveys. 4 It also includes the 

 small fragments described in his paper 5 on the Albany granites 

 and their contact phenomena. 



" 5. The Pacific Slope Quicksilver collections. These 

 comprise several hundred small specimens (mostly 4x6 cm.), 

 rocks and ores from the quicksilver regions of the locality 

 above noted, as collected and described by G. F. Becker 6 



1 Emmons, Samuel Franklin. "Geology States Geological Explorations of the For- 



and Mining Industry of Leadville, Colorado, tieth Parallel, Volume vi, 1876. 



with Atlas." Monograph XII of the United 4" The Geology of New Hampshire." 



States Geological Survey, 1886. Concord, 1878, Volume in, Part iv. 



2 " Geology of the Comstock Lode and the 5 American Jaurnal of Science, 1881, Vol- 



Washoe District, with Atlas." Monograph ume xxi, pages 21-32. 



Ill of the U. S. Geological Survey, 1882. 6 Monograph xm of the United States 



3 " Microscopic Petrography." United Geological Survey, 1886. 



