338 0. oe Morsh—The Order Theropoda. 
(5.) Family Avphieineict Vertebree renters Pubes rod- i 
Five di oy in manus, and three 8. 
Genera, Amphisaurus ash ? Bath aa 
J Ulgpapanivas Paleosaurus, rb dats aioe 
Sub-order COLLURIA. 
(6.) pune Celuride. Vertebre and beanie of skeleton pneu- 
Anterior cervicals convexo-concave; remaining 
Pact bi-concave, Cervical ribs “cobssified with vertebra. 
Metatarsals very long, and slender 
Genus, Colurus. 
Sub-order COMPSOGN ATHA. 
(7.) ey wale iaehabi Cervical vertebra convexo-con 
ning vertebre bi-concave. Thre ¢ functional 
digits in manus and pes. Ischia with long avin phy on 
median line : 
Genus, Dobie 
Of these seven well marked families, the Amphisauride ad iB 
Zanclodontide are Triassic, the Megalosauride are Jurassic — 
and Cretaceous, while the éthiers are all Jurassic alone. i. 
There are still some very diminutive carnivorous Dinosaurs P 
that cannot at present be referred to any of the above families; 
but this may in part be due to the can condition 1 — 
which their remains have been found. . 
The peculiar orders Hallopoda and Aétosauria inclu sll y 
~ earnivorous reptiles which are allied to the Déinosauria, but — 
they aad from er group in some of its most characteristie 
fea In both Aétosawrus and Hallopus, the caleaneum is 
oe produged Awe In the former genus, the entire — 
limbs are crocodilian, and this is also true of * e 7 cover” C 
: th has 
this may be the case in true alg capecia ally f 
rias. Future discoveries will # edna bring to li ht Mm nter- e 
mediate forms between these orders and the typical Dinosa 
Yale College, New Haven, March 17, 1884. 
