1887.] NATURAL SCIENCES OF PHILADELPHIA. 419 



April 4, 1887, Upon the anatomy of the sexual apparatus of 

 the Bee, by Prof J. A. Ryder. 



April 4, 1887. Description of a new Microtome for making 

 large sections of the brain etc., by Prof. J. A. Ryder. 



April 18, 1887. The hearing organ of Mysis flexuosa, by 

 by Harold Wingate. 



April 18, 1887. Hemiarcyria serpula, by Dr. George A. Rex. 



April 18, 1887. Structure of the leaf of Deutzia, by Dr. J. B. 

 Brinton. 



April 18, 1887. Anatomy of the leg of the Honey Bee, by Dr. 

 L. Brewer Hall. 



April 18, 1887. The making of wax cells, by John C. Wilson. 



June 6, 1887. Karyokinesis, by Prof. J. A, Ryder. 



Sef)tember 19, 1887. The evolution of an eight-limbed verte- 

 brate, by Prof J. A. Ryder. 



September 19, 1887. The warts upon the legs of the Horse, by 

 Prof Harrison Allen. 



October 3, 1887. The development of the ovum in the Field 

 Mouse, by Prof J. A. Ryder. 



October 17, 1887. Placentation in animals, by Prof. J. A. 

 Ryder. 



On October 17, a course of lectures to be delivered during the 

 winter was arranged by the lecture committee. The first one by 

 Prof J. A. Ryder upon "The two great Plans of Animal Organiza- 

 tion" was given in the hall of the Academy Monday, November 

 21, 1887. 



Very respectfully, 



Robert J. Hess, 



Recorder. 



REPORT OF THE CONCHOLOGICAL SECTION. 



The Recorder of the Conchological Section respectfully reports 

 that during the year past, such Conchological papers as have been 

 accepted have been published by the Academy as heretofore. 



The Section has lost by death, one member, Isaac Lea, LL. D. 

 who died in last December at the advanced age of ninety four years. 

 At a.sj^ecial meeting of the section held Dec. 14th, 1886 the follow- 

 ing minute was adoj)ted and by direction transmitted to his family. 



