632 SIMQIDIGES, TAO SIGIONEIN Ts) 
In his last classification of the Dznosaurs,t Marsh recognizes 
essentially the same group as Baur, but considers them as orders 
of the subclass Dinosauria. These three groups are called 7he- 
ropoda, Sauropoda, and Predentata; the same groups were called 
by Baur Megalosauria, Cetiosauria, and [guanodontia. 
It is without the scope of the present article to discuss the 
intricate taxonomy of this group, and it will perhaps suffice to 
recognize the three distinct groups and to know that the tend- 
ency at the present is to consider the Dnosauria as an unnatural 
order and to speak of the Dinosaurs as a very loosely connected 
group made up of several distinct and well-defined groups. 
THEeropopa (Megalosauria).— Brain case incompletely 
ossified in front; no ossified alisphenoid; an epipterygoid 
(columella); premaxillaries not excluding maxillaries from the 
nasal opening; jugal connected with the alveolar border of 
the maxillaries on the same plane; quadrato-jugal free from 
the maxillary; quadrate directly backwards; mandible without 
predentary bone; dentary without coronoid process ; sacral ver- 
tebre with the ribs joined intervertebrally ; diapophyses of the 
vertebre without connection with the ribs, but reaching out to 
and joining the ilium; pubes directed forward and_ strongly 
united at the distal end; limbs with the bones frequently hol- 
low; posterior limbs much the largest; feet terminated by claws 
that are prehensile in the fore foot ; locomotion mainly bipedal 
and digitigrade. 
Anchisaurus, the oldest one of this group, as well as the old- 
est known Dinosaur, is from the Triassic Red Sandstone of the 
Connecticut Valley. A nearly perfect skeleton was obtained 
from these rocks in the vicinity of Manchester, Conn., in 1884. 
Previous to this time there had been fragments of skeletons 
obtained from the Triassic rocks of Pennsylvania and Prince 
Edward’s Island, in Canada, as well as from the same deposits 
in the Connecticut Valley that in all probability belong to the 
same genus. sf 
™* The Dinosaurs of North America,” 16th Ann. Rept. of the Director of the U. 
Sp (Go Shy JP I 
