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. 6tk, 1862. 
Pursuant to the By-Laws, an election of members of tbe Standing 
Committees for 1863 was held, as follows: 
ETHNOLOGY. 
J. A. Meigs, 
S S. Haldeman, 
I. I. Hayes. 
BOTANY. 
E. Durand, 
Joseph Carson, 
Aubrey H. Smith. 
COMP. ANAT. AND GEN. ZOOLOGY. 
Joseph Leidy, 
J. M. Corse, 
J. H. Slack. 
GEOLOGY. 
Isaac Lea, 
Charles E. Smith, 
J. P. Lesley. 
MAMMALOGY. 
J. H. Slack, 
John Cassin, 
J. L. Le Conte. 
MINERALOGY. 
Wm. S. Yaux, 
J. C. Trautwine, 
T. D. Rand. 
ORNITHOLOGY. 
John Cassin, 
S. W. Woodhouse, 
J. H. Slack. 
PALAEONTOLOGY. 
Joseph Leidy, 
T. A. Conrad, 
J. L. Le Conte. 
HERPETOLOGY $ ICHTHYOLOGY. 
E. D. Cope, 
R. Bridges, 
J. C. Morris. 
CONCHOLOGY. 
T. A. Conrad, 
W. G-. Binney, 
Gr. W. Tryon, Jr. 
PHYSICS. 
B. Howard Rand. 
Wm. M. Uhler, 
R. E. Rogers. 
LIBRARY. 
Wm. S. Yaux, 
Joseph Leidy, 
Joseph Jeanes. 
ENTOMOLOGY AND CRUSTACEA. PROCEEDINGS. 
R. Bridges, Robert Bridges, 
Samuel Lewis, Joseph Leidy, 
E. T. Cresson. Wm. S. Yaux, 
John Cassin, 
Thomas Stewardson. 
1863.] 
