1G4 PROCEEDINGS OF THE ACADEMY OF [1819. 



Mr. Median also referred to the well known relationship be- 

 tween Gomposilse and Umbelliferse, and noted the presence of 

 vittse in the akenes of this plant as a point of agreement between 

 the two orders, uncommon in those of the Composite family. 



The Larva of Eurypauropus spinosus. Mr. J. A. Ryder an- 

 nounced that, in a vial in which he had kept four living specimens 

 of this animal for two months past, he had found a single speci- 

 men of its very minute hexagonal larva about one-hundredth of 

 an inch long. It had three segments, and a very rudimentary 

 fourth one, and was of a pale reddish or lilac color; exceedingly 

 compressed, more so relatively than the adults, and with the 

 antennae bifurcate as in the latter. The specimen in life was 

 almost as wide as long. Remains of the shells of ova w r ere also 

 found in a crevice in the same piece of decayed wood upon which 

 the larva was found, and the adults were seen to get into the 

 same crevice and remain for a da} r at a time, so that it is fair to 

 infer that they are probably the parents of the larva in question. 

 The finding of this larva places the validity of the species beyond 

 question, and also renders it quite certain that six segments is the 

 normal number in the adult. The ease with which these animals 

 bear confinement for a protracted period gives promise that still 

 other specimens of larva? may be looked for in the same vial in 

 the course of the season. 



Wm. P. Foulke was elected a member. 



July 1. 



The President, Dr. Ruschenberger, in the chair. 



Twenty members present. 



A paper entitled " On the Genera of Felidoe and Canidae," by 

 Edw. D. Cope, was presented for publication. 



The death of Thomas S. Root, a member, was announced. 



July 8. 

 The President, Dr. Ruschenberger, in the chair. 

 Twentj'-five members present. 



Fossil Foot Tracks of the Anthracite Coal Measures. Prof. 

 Leidy read a letter from Mr. W. Lorenz, Chief Engineer of the 

 Philadelphia and Reading Railroad Co., referring to the fossil 

 specimen presented this evening by Mr. Wm. D. H. Mason, of 



