58 
RASORES. 
Their internal structure also closely assimilates 
with that of the true gallinaceous birds, and in 
the group taken together, we find many foreign 
species, which, by their forms or manners, run 
very closely into genera that meet them from 
other families. There is one peculiarity, how- 
ever, by which they differ, we believe, from all 
the Rasores, that of their young being produced 
unfledged,* and requiring care and attention be- 
fore leaving the nest ; this is their nearest tie to 
the Incessores, and we aro not at present aware 
of any example among that order, where the 
young are even partially clothed with down, or 
run soon after exclusion from the egg.f 
Britain possesses examples of three genera, one 
of them, however, resting on the capture of one, 
or at most two specimens. 
Coi.umba — Generic character . — Bill of mean 
strength, anteriorly deflected, maxilla with 
a slight angle; nostrils nearly linear, widest 
anteriorly and covered with a soft protube- 
rant cartilage ; tarsi short, partly feathered 
in front; toes entirely divided, hind toe of 
* Some of the Cracida breed on trees ; but we believe that 
here the young are covered with down, and are almost imme- 
diately transported to the ground. In the genus Penelope, 
the young are like the typical species. 
Mr. Gould has mentioned a species of C/inclosoma from 
Australia, which breeds on or near the ground, and the young 
of which, he understood, left the nest at a very early period. 
