370 abstracts: zoology 



Aside from its scientific interest this volume has a large practical 

 value, as it offers to the engineer a large number of points determined 

 trigonometrically and correlated on one geodetic datum. If the engi- 

 neer wishes to extend this triangulation or to base other surveys upon 

 it, the positions, descriptions, and sketches given in this volume will 

 supply the data that he will need. W. F. R. 



GEOLOGY. — A gold-platinu7n-palladium lode in southern Nevada. 

 Adolph Knopf, U. S. Geol. Survey Bull. 620-A. Pp. 1-18. 1915. 

 The ore of the Boss gold mine in the Yellow Pine mining district, 

 Clark County, Nevada, has recently been shown to be rich in platinum 

 and palladium. The deposit consists of a fine-grained quartz mass, 

 which constitutes an irregular siliceous replacement of Carboniferous 

 dolomites along a series of vertical fractures. The main ore shoot, in 

 which from 1000 to 2000 tons had been developed at the time of 

 visit, averaged in ounces to the ton: Gold, 3.46; silver, 6.4; platinum, 

 0.70; iDalladium, 3.38. The precious metals are especially associated 

 with the rare mineral plumbojarosite, Pb [Fe (0 H)2]6 (S04)^; pockets 

 of this mineral carry 100 or more ounces of palladium and platinum 

 and several hundred ounces of gold to the ton. The only sulphide so 

 far found in the mine is chalcocite, and this is probably of secondary 

 origin. The occurrence of platinum and palladium in this Nevada 

 gold ore is of some interest, inasmuch as a review of the known distri- 

 bution of platinum in veins shows that the Boss vein is one of the few 

 primar}^ deposits in which metals of the platinum group are present 

 in more than traces, and, with one possible exception — the New Ram- 

 bler deposit in Wyoming — is the only primary deposit of economic im- 

 portance in which these metals are the constituents of predominant 

 value. A. K. 



ZOOLOGY. — The crinoids collected by the Endeavour between Fremantle 



and Geraldton {Western Australia). Austin Hobart Clark. 



Records of the Western Australian Museum and Art Gallery, 1^: 



113-129. 1914. 



A detailed description is given herein of the specimens of each of the 



twelve species of crinoids which were obtained by the "Endeavour" 



off southwestern Australia. Of these twelve species one (CapiUaster 



sentosa) was not previously known from Australia, while two {Neo- 



nietra gorgonia and N. conaminis) represent a family (Calometridae) 



heretofore not reported south of the Sunda Islands. A. H. C. 



