144 



Dr. Cullen on the Chilar Pouch 



down as the furcular bone, enveloped closely throughout its 

 extent by a thin muscular covering, exactly analogous in structure 



to the cremaster or platysma hyoides. The structure of the 

 sac or pouch itself is certainly not composed of cellular tissue, 

 as stated by Degland ; but in each of these specimens is a 

 separate and distinct though delicate bladder, very much re- 

 sembling in appearance the air-bladder in fishes. Its shape, 

 which is very accurately represented in the accompanying 

 drawing (for which I am indebted to Mr. William Campion), 



made when the pouch was suspended so as to be filled with 

 water, is very peculiar. It is dilated very considerably just 

 below the sphincter, is constricted towards the middle of the 

 neck, and in the depression between the furcular bones swollen 

 out into an ovoid shape. The larger of these pouches mea- 

 sured, when suspended and filled with water, nine inches, and 



