XVIII BIOLOGICAL SOCIETY OP WASHINGTON. 



ONE HUNDRED AND EIGHTY-SECOND MEETING, 

 November 14, 1891. 



The President in the chair, and thirty-one members present. 

 Mr. T. S. Palmer read a paper entitled THE WINTER ASPECTS 



OF THE MOJAVE DESERT REGION. 



Dr. V. A. Moore spoke of a case of ECHINOCOCCUS IN 

 SWINE.* Discussed by Drs. Smith and Stiles. 



Dr. C. W. Stiles presented a paper entitled NOTES ON PARA 

 SITES, describing Coccidium bigeminum &\Y& Filar tag aster ostei.^ 



Prof, L,ester F. Ward spoke of HAECKEL'S RADIOLARIA OF 

 THE CHALLENGER EXPEDITION, and presented a communica 

 tion entitled THREE DAYS IN THE TROPICS. The latter was 

 discussed by Dr. Merriam and Mr. Coville. 



ONE HUNDRED AND EIGHTY-THIRD MEETING, 

 November 28, 1891. 



The President in the chair, and thirty-six persons present. 



The following active members were elected on recommenda 

 tion of the Council : 



Mr. W. E. Clyde Todd and Mr. J. D. Figgins. 



Dr. George Marx, read a paper on THE STRUCTURE AND 

 CONSTRUCTION OF THE GEOMETRIC SPIDER WEB. Dis 

 cussed by Dr. Th. Gill. 



Mr. David White presented a paper entitled SOME PECULIAR 

 FORMS IN AN UPLAND CARBONIFEROUS FLORA.J It was dis 

 cussed by Prof. Lester F. Ward. 



Prof. F. H. Knowlton presented a paper on FRUITING 

 FERNS FROM THE L,ARAMIE GROUP. Discussed by Professor 

 Ward, Mr. C. D. Walcott and Dr. Cooper Curtice. 



* Amer. Journal of Comp. Med. and Vet. Archives and Annual Report 

 of the Dept. of Agriculture, 1891. Report on Animal Parasites for 1891, 

 C. W. Stiles. 



f Proc. U. S. Nat. Museum, 1892. Note preliminarie sur quelques 

 Parasites, Bull. d. 1. Soc. Zool. d France, 1891, pp. 163-165. 



J Bulletin 98, U. S. Geological Survey. (In press.) 



