234 MB. r. B. BBDDABD ON DlSSUaA EPISOOPUS. [Peb. 4, 



with special lung-muscles, as can be seen in dissections of Nycti- 

 corax 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 wliere 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. 



I'ig.3. 



Diagram of the eyrinx of Lepioptilus (see p. 232). 



The origin of these muscles from the bronchus is interesting in 

 view of a very similar relationship of lung-muscles to bronchi 

 which I desci-ibed 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 Oaneroma 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 have not the broncho-pulmonary muscles of 

 Nycticorax. It seems, therefore, that we have here a character 

 which serves to distinguish the Ardeidse from the Ciconiidee. 



The Syrinx of the Ardeidce. — Though the syringes of such of the 

 Ardeidse 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. 



' " Notes on the Anatomy of the Condor," P, Z, S.. 1890, p. 146, Trogdciit 

 fig. 3. 



