_  Boology. : 441 
tween the existing faunas of different readings, as in the extinct groups 
of animals and plants which geological researches have revealed. The 
moir was illustrated by numerous drawings, and the gigantic hume- 
of the Pelorosaurus and other bones were placed before the Society. 
0.; 1850, v, p. 8.)—Dr Leidy presented to the examination of the 
ety a colored and several other drawings of what he termed an en- 
serpents of such a forest. Me ; 
\ somewhat similar drawing he exhibited, taken from the small in- 
tine of Julus marginatus. : 
Other drawings were also presented. Dr. L. stated that among his 
tion of Julides, he had a number of times observed individuals 
become dull in color, and almost motionless, which phenomena 
followed by the death of the animal. It occurred to him that, in 
h a state, there might be exhibited some change in the character of 
tophyta, as usually found in the active. condition of the anitnal. 
‘removing the intestine of an individual which had just died, he 
d that the entozoa which usuatly occupied the small intestine, had 
resenting, when viewed by transmitted light, some resemblance to a 
‘Minute bleached shell of an Echinus; by reflected light, it resembled 
8 minute, white Lycoperdon. ‘This plant was strewed all over the mu- 
m rew in greatest quantity along the course of fila- 
he case. : 
he had discovered a fourth species of Enterobrus 
in Polydesmus virginiensis, and another entophyte analogous to Entero- 
brus growing in Polydesmus granulatus. The latter differs from Ente- 
‘Yobrus in having numerous globular cells at the free extremity of the 
Szconp Series, Vol. IX, No. 27—May, 1850. 
