234 MR, F, E, BEDDARD ON DISSURA EPISCOPUS. [Feb. 4, 
with special lung-muscles, as can be seen in dissections of Mycti- 
corae and Cancroma. In the former bird there are four pairs 
of muscles arising from the rib, each individual muscle, of course, 
from a single rib, But in addition to these, two muscles arise on 
each side from the bronchus just where it enters the lung-substance 
and fan out over the aponeurosis; they both spring from the 
posterior surface of the bronchus and diverge slightly from each 
other to their insertion. 
Fig. 3. 
Diagram of the syrinx of Leptoptilus (see p. 232). 
The orjgin of these muscles from the bronchus is interesting in 
view of a very similar relationship of lung-muscles to bronchi 
which I described some years ago in the Condor’; but in the 
latter bird the muscles are attached at the distal end to the parietes 
and not to the lung-surface, though, as in Nycticorax, they arise 
from the bronchi. 
In Caneroma five pairs of ribs border the area occupied by the 
lungs. From the last four of these arise slender slips of muscle 
which passing forward end upon the pulmonary aponeurosis The 
bronchi in this Heron Lave not the broncho-pulmonary muscles of 
Nycticoraw. It seems, therefore, that we have here a character 
which serves to distinguish the Ardeidw from the Ciconiide. 
The Syrinx of the Ardeide.—Though the syringes of such of the 
Ardeide as I have been able to examine differ but little among 
themselves, it may be useful to give a short account of what I have 
ascertained, since but little, so far as 1 am aware, has been published 
on the matter. 
ny Notes on the Anatomy of the Condor,” P. Z. §,. 1890, p 146, woodcut 
g. 3, aa : 
