PROCEEDINGS. XXXIX 



plied to Histology, presented by Dr. Coues at the previous meeting, 

 Mr. N. P. Scudder led with a paper on BIOLOGY AND CLASSIFICA 

 TION. 



Mr. John A. Ryder read a paper ON THE STRUCTURES OF PROTO 

 PLASM AND KARYOKYNESIS.* 



FORTY-SECOND MEETING, March 2, 1883. 



The President occupied the chair. Forty-three members present. 



Prof O. T. Mason read a paper on THE HUMAN FAUNA OF THE 

 DISTRICT OF COLUMBIA, and Dr. M. G. Ellzey spoke on HYBRID 

 STERILITY, being a plea against the hypothesis of evolution. 



FORTY- THIRD MEETING, March 16, 1883. 



The President occupied the chair. Fifty members were present. 



Dr. Ellzey 's paper, presented at the last meeting, was discussed 

 by Mr. Henry W. Elliott and others. 



Mr. Orville A. Derby, Curator of the Geological Department of 

 the National Museum of Brazil, under the title of BIOLOGICAL 

 NOTES FROM BRAZIL, gave an account of the present condition of 

 biological science in that country. Remarks were made by Messrs. 

 White and Elliott. 



Lieut. Francis Winslow, U. S. N., read a short paper on THE 

 GIANT CLAMS OF THE PACiFic,f exhibiting specimens. 



* 1882. RYDER, JOHN A. Observations on the absorption of the yelk, the 

 food, feeding, and development of embryo fishes, comprising some investigations 

 conducted at the Central Hatchery, Armory Building, Washington, D. C., in 

 1882. <Bulletin U. S. Fish Commission, II, pp. 179-205, 1882. (XII Specific 

 character of protoplasm, pp. 202-205.) 



f 1883. WINSLOW, FRANCIS. Catalogue of the Economic Mollusca. <De- 

 scriptive Catalogues of the Collections sent from the United States to the Inter 

 national Fisheries Exhibition, London, 1883. Bull. U. S. National Museum, No. 

 27, Part D, pp. 185-270, 1883. 



