NATURAL SCIENCES OP PHILADELPHIA. 53 



its discovery is certainly an interesting one, as it would present an evidence 

 of the existence of Lepidopterous Insects, at a much earlier period in our 

 world's history than has hitherto been suspected. 



As this fossil will doubtless be met with in the Coal Measures at other lo- 

 calities, whether or not its connection with the mature Butterfly or Moth can 

 ever be positively established, it seems desirable, for convenience of refer- 

 ence, that it should receive a name ; although we are unable to point out 

 any well defined characters from the only specimen seen, by which it can be 

 distinguished from the larva of several existing types. That there is any 

 probability, however, of its belonging to any existing genus, will, we think, 

 not be maintained by any person familiar with the range of generic types 

 in time. 



April 4:th. 



Vice-President, Cassin, in the Chair. 



Twentv-two members present. 



The following paper was presented and referred to a Committee : 

 " Diagnoses Specierum et varietatum novarum Molluscorum," etc. 

 By Philip P. Carpenter. 



JlprilWth. 

 The President, Dr. Bridges, in the Chair. 



Twenty-five members present. 



The following were presented and referred to a Committee : 



" Synopsis of the genus Pomoxys," " On the genus Caulolatilus," 

 " Oo the cranial characteristics of Gadus proximus," and " Note on 

 several genera of Cyprinoids." By Theo. Gill. 



The Curators exhibited a large living specimen of the Great Crab- 

 Spider, Mygale cancerides, recently brought from Brazil, and presented 

 by Mr. Newton. 



The Secretary announced the death, on the 30th ult., of Major 

 Charles I. Maceuen, late a member of the Academy. 



April \%th. 

 The President, Dr. Bridges, in the Chair. 



Twenty members present. 



The following papers were presented and referred to Committees : 



" Observations on the Eocene Lignite Formation of the United 

 States," and " Catalogue of the Eocene Annelides, etc." By T. A. 

 Conrad. 



" Descriptions of three new species of Exotic Uniones." By Isaac 

 Lea. 



The Secretary read the following : 



1865.] 



