Geology and Mineralogy. 229 



Eurypterids. In the Swedish and Scottish specimens the abdo- 

 men ends in a stout spine, like modern Scorpions ; in the Ameri- 

 can this portion is absent from mutilation. 



The same number of this Bulletin contains descriptions, by Mr. 

 Whitfield, of a new Lituites (L. Bickmoreanus Wh.) from the 

 Niagara limestone at Wabash City, Indiana, and of a Homalono- 

 tus (3. major Wh.) from the upper part of the Oriskany Sand- 

 stone of Ulster Co., N. Y. The Hotnalonotus had a breadth of 

 five and one-half inches, and, judging from the large but impei'- 

 fect specimen, was probably fifteen and one-half inches long. 



7. Mineral Resources of the United States. Calendar years 

 1883 and 1884, by Albert Williams, Jr., Chief of Divison of Min- 

 ing Statistics and Technology. 1016 pp. 8vo. Washington, 1885. 

 (U. S. Geological Survey, J. W. Powell, Director). — This report, 

 the second of the series, brings the statistics of the mining indus- 

 tries of the United States down to December 31, 1884. It is a 

 large volume containing a vast amount of valuable information 

 •on a wide range of topics. The successive chapters on coal, coke, 

 petroleum, natural gas, the metals, gold, silver, copper, lead, etc., 

 also on building stones, clays, precious stones, phosphates, salt 

 and so on, have been for the most part prepared by specialists, 

 whose united contributions, with the labors of the editor, make a 

 work of more than usual importance. 



8. Contributions to Mineralogy ; by F. A. Genth. — Dr. Genth 

 has added another to his important papers on Chemical Miner- 

 alogy, giving the results of much careful work. The following 

 are some of the more interesting analyses : 



Joseite from San Jose, Brazil : Te 14-67, Se 1-46, S 2-84, Bi 81-23 

 = 100-20. 



Galenobismutite from Sweden : (f) S 9*75, Se 12-43, Bi 49*88, 

 Pb 27*88, Ag 0-33; specific gravity 7* 145. The formula is Pb(S, Se) 

 + Bi. 2 (S, Se) 3 with S : Se = 2 : 1. 



Argentobismutite (Silberwismuthglanz of Rammelsberg) from 

 Lake City, Colorado : S [16'66], Bi 52-89, Ag 26-39, Pb 4-06 = 100; 

 the formula is Ag 2 S + Bi 2 S 3 with a little lead probably replacing 

 part of the silver. 



Cosalite from the Alaska mine, Colorado : S 16-80, Se tr., As 

 0-04, Sb 0-51, Bi 44-95, Pb 28*10, Cu 8-00, Ag 1'44, Zn 0*24= 100-08. 

 Also from the Gladiator mine : (§) S 17-17, Sb 0*84, Bi 45-09, Pb 

 24-61, Cu 5-84, Ag 5-75, Zn 0-58 = 99-88. 



Beegerite from the Treasurv Vault mine, Park county, Colorado : 

 $ [14-59], Bi 19-81, Pb 50*16^ Ag 15-40=100. 



Tetrahedrite from the Governor Pitkin mine, associated with 

 sylvanite : (f ) S 25-97, As 3-22, Sb 25-51, Bi 0-37, Cu 37*68, Ag 0*60, 

 -Zn 7-15, Fe 0-64, Mn 0-10 = 101*24; specific gravity 4-885. 



Polybasite from the Terrible Lode, Clear Creek county, Col. ; 

 S [16-70], SblO*J8, As 0-78, Ag 62-70, Cu 9-57. Fe 0-07 = 100 : spe- 

 cific gravity 6*009. 



Arsenopyrite from Northern Alabama: S 18*32, As 47*10, Fe 

 33*84, Cu 0*70 = 99*96. 



