6 RECORDS VOLUME XI, JAN., 1 91 9. 



gradual diminution of the thymus. It is pos- 

 sible that it may have an attachment to this 

 portion of the syrinx from the first, but what 

 function it can have through this attach- 

 ment is difficult to determine ; at all events, 

 it appears to be unique in this species as no 

 other bird which has come under my notice 

 has anything like it. 



This body is not attached to the S3'rinx 

 by its entire base, but only adheres along up- 

 per side, fig. 11, C, where I have given a cut 

 of the left side of the syrinx with the gland 

 removed; the shaded portion at c shows the 

 points of adhesion. Beneath the gland, and 

 partly concealed by it, is a vibrating mem- 

 brane lying between the third and fourth 

 bones of the syrinx, see C, u, where there is 

 an outside view of this membrane, and E, u, 

 an inside view, c being the gland. On the 

 lower side of the gland is an orifice that ex- 

 tends over the membrane back to the point 

 of attachment of the gland to the syrinx, A, 

 r, r. At B, c, is a side view of the gland. 



