XII BIOLOGICAL SOCIETY OF WASHINGTON. 



Mr. Lester F. Ward read a paper on The King Devil.* 

 Discussed by Dr. Merriam and Messrs. Seaman and Ulke. 



Mr. Jno. B. Smith read a paper entitled Some Remarks on 

 Sexual Characters in Dachnosterna.! Discussed by 

 Messrs. Ward, Ulke, and Mann. 



Dr. Theodore Gill gave a review of The Families of 

 Fishes. Discussed by Messrs. Ward, Mann, Stejneger, Dall, 

 and Fernow. 



One Hundred and Thirty-first Meeting, 

 November 3, 1888. 



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

 Mr. F. H. Knowlton presented a paper on Fossil Wood 



AND LjGNITES OF THE POTOMAC FORMATION. £ 



Mr. W. H. Dall read a paper entitled The Modifications 

 of the Gill in Univalve Mollusks.§ 



Dr. Theodore Gill described The Characteristics of the 

 Family Scatophagid.e. 



Dr. C. Hart Merriam described A New Species of Arvi- 



COLA FROM THE BLACK HlLLS OF DAKOTA. II 



One Hundred and Thirty-second Meeting. 



November 17, 1888. 



The President in the chair, and forty persons present. 



Mr. Lester F. Ward read a paper on A Comprehensive 



* 1889. Botanical Gazette, Vol. XIV, pp. 10-17, January. 



f 1888. Insect Life, Vol. I, p. 180, December. 



X 1888. The American Geologist, Vol. Ill, No. 2. pp. 99-106. 



\ 1889. Results incorporated in Report on Blake Gasteropods, Bull. 

 Mus. Comp. Zool., Vol. XVIII. 



|| 1888. Merriam, C. Hart Description of a New Species of Meadow 

 Mouse \_Anncola longicaudd\ from the Black Hills of Dakota <Am. 

 Nat., Oct. 1888, 934-935, figs, of teeth. 



