XVIII BIOLOGICAL SOCIETY OF WASHINGTON. 



ONE HUNDRED AND FORTY-FIRST MEETING, 

 March 23, 1889. 



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



Mr. W. H. Seaman read a paper on OUR PRESENT KNOWL 

 EDGE OF THE ROTIFERA. Discussed by Mr. Knowlton. 



Mr. C. Iy. Hopkins presented A POINT OF DEFINITION rela 

 tive to the use of the terms hybrid and cross. 



Mr. W. H. Ball described THE REPRODUCTIVE ORGANS IN 

 CERTAIN FORMS OF GASTEROPODA.* 



ONE HUNDRED AND FORTY-SECOND MEETING , 

 April 6, 1889. 



The President in the chair, and fifteen members present. 



On account of the small attendance and the absence of paper- 

 readers (due to very inclement weather), the program was 

 postponed until the following meeting. 



ONE HUNDRED AND FORTY-THIRD MEETING, 

 April 20, 1889. 



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



The death of Dr. J. H. Kidder, an active member of the 

 Society was announced by the President. 



Mr. J. F. James presented a paper entitled THE EFFECT OF 

 .RAIN UPON EARTH-WORMS. t Discussed by Drs. Merriam and 

 W. H. Fox, and Messrs. True and Ward. 



Mr. F. W. True read a paper on the OCCURRENCE OF 

 SOWERBY'S WHALE ON THE COAST OF NEW JERSEY. Dis 

 cussed by Drs. Merriam and Curtice. 



^1889. Incorporated in Report on Blake Gasteropoda, Bull. Mus. 

 Comp. Zool., Cambridge, Mass., Vol. XVIII. 



t 1889, Am. Nat., August. Issued Dec. 15, 1889. 



