NATURAL SCIENCES OF PHILADELPHIA. 



25 



of the granulated surface of the two, and the impossibility of proving them 

 distinct. The original specimen, however, was obtained from the "Archimedes 

 limestone" of St. Louis County, which, according to Prof. Hall, is the equiva- 

 lent of the "Keokuk limestone." 



Of the foregoing species, four are not positively known to occur below the 

 base of the Burlington limestone ; but they are confidently embraced in the 

 fauna of the yellow sandstones, for the reason that they ascend no higher, 

 and that of the 131 remaining species constituting that fauna, not less than 

 40 are known to range upwards to the same horizon. 



University of Michigan, Dec. 6th, 1S62. 



Pursuant to the By-Laws, an election of members of the Standing 

 Committees for 1863 was held, as follows : 



ETHNOLOGY. 

 J. A. Meigs, 

 S S. Haldeman, 

 I. I. Hayes. 



CO MP. AN AT. AND GEN. ZOOLOGY. 

 Joseph Leidy, 

 J. M. Corse, 

 J. H. Slack. 



MAMMALOGY. 

 J. H. Slack, 

 John Cassin, 

 J. L. Le Conte. 



ORNLTLIOLOGY. 

 John Cassin, 

 S. W. Woodhouse, 

 J. H. Slack. 



HERPETOLOGY ICHTHYOLOGY. 

 E. D. Cope, 

 B. Bridges, 

 J. C. Morris. 



CONCHOLOGY. 

 T. A. Conrad, 



W. G. BlNNEY, 



a. W. Tryon, Jr. 



ENTOMOLOGY AND CRUSTACEA. 

 B. Bridges, 

 Samuel Lewis, 

 E. T. Cresson. 



1863.] 



BOTANY. 

 E. DURAND, 



Joseph Carson, 

 Aubrey H. Smith. 



GEOLOGY. 

 Isaac Lea, 

 Charles E. Smith, 

 J. P. Lesley. 



MINERALOGY. 



Wm. S. Vaux, 

 J. C. Trautwine, 

 T. D. Band. 



PALAEONTOLOGY. 

 Joseph Leidy, 

 T. A. Conrad, 

 J. L. Le Conte. 



PHYSICS. 

 B. Howard Band, 

 Wm. M. Uhler, 

 B. E. Bogers. 



LIBRARY. 

 Wm. S. Vaux, 

 Joseph Leidy, 

 Joseph Jeanes. 



PROCEEDINGS. 

 Bobert Bridges, 

 Joseph Leidy, 

 Wm. S. Vaux, 

 John Cassin, 

 Thomas Stewardson, 



