280 ELEMENTS OF ORNITHOLOGY. 
maxillo-palatines in front, and with the pterygoids and palatines 
behind; feather-tracts well differentiated from the bare tracts 
on both the upper and under parts; oil-gland tufted ; ceca 
present ; basipterygoids placed very far backwards; no pygostyle. 
This order again contains but a single family named Tinamide, 
from the Tinamous! which compose it, and which are, their 
structure shows, widely different from the Coursers (with which 
we introduced them to the reader’s notice) in spite of the super- 
ficial resemblance which exists between them. They lead us 
on, in fact, to the next and last Avian order—one which belongs 
to the second subclass of Birds, the subclass /atite. 
This eighteenth and last order of Birds, of about 20 species, 
is the Order Struthiones, which contains the suborders 1. Ap- 
terygiformes and 2. Dromeiformes. These groups may be thus 
characterized : — 
Subclass II. RA TIT A’. 
Order XVIII. STRUTHIONES. 
Basipterygoid processes very large and placed on the pasi- 
pterygoid rather than on its rostrum ; oil-gland absent ; plumage 
of neck continuous ; palatines articulating with the pterygoids 
and not with the sphenoidal rostrum ; no power of flight. 
Suborder 1. Apterygiformes. ; 
A hallux present ; bill greatly elongated ; wing a mere rudi- 
ment. 
Suborder 2. Dromeiformes. 
No hallux ; bill not greatly elongated ; wing not a mere rudi- 
ment. 
There are three families of this order. The first of these, 
Apterygide, is the only one of the first suborder and is consti- 
tuted by the several species of Apteryx* alone. The second 
family, the Dromeide, contains the Emeus* and the Casso- 
meee ole * The characters of this Subclass are given above, p. 258. 
=P. 64. 2 EGG. 
