Geology and Natural History. 219 
re, an approach to the long sacrum of the same orders. The 
lodon) is a Sauropterygian feature. In the Sauropterygia the 
shortened vertebral column, and long muzzle (Pistosaurus) in the 
hosauria display an increasingly Crocodilian character as we 
The 2208 
tylus) loses the bird-like head, and assumes the ill-defined convexity 
f the Crocodiles; the tibia (Plateosaurus) loses the bird-like 
ria, of the Trias, than those of the Cretaceous. There are 
oubtful, owing to the generalized character of the parts we pos- 
Sess. Thus the Rhynchosaurus of the Trias of England is allied 
to that order, and to the Anomodontia. The Rhopalodon of the 
ik es 
lar 
ones derived from the study of the Mammalia, that the successional 
g' 
ely exhibited by the subordinate contents of the orders than 
decide that we must look for the origin of the orders in periods 
Prior to those in which we now know them, if, as some supp 
they originated in still more generalized t saccords with 
Huxley’s view of the period of origin of the mammalian orders. 
It must also be remembered that the above deduction as to 
Geological distribution is precisely that of geographical distribu- 
ch ; 
. Ey a; by F.C CALVERT. 
(Am, Ma . N. H., IV, viii, 129).—A solution of sugar in which 
infusoria had appeared, when subjected to 212° F., still contained 
bod 
Oo 
5 
Bees 
e-8-4 
S 
S 
a 
4 or5 small black Vibrios quite active, and 2 or 3 energetic o 
of igin of Genera, 1868; Hypothesis of Evolution, 1870. 
AM. Jour. Sor—Tuep Series, VoL. II, No. 9.—Sepr., 1871. 
15 
