[Pitoc. KoY. Soc. Victoria, 25 (M.S.), Vr. 11.. 1918]. 



Art. XXIII. — The Si/rlnx of the Convnton Fowl, Us St r ad are 

 <vn d De veloj )ute at. 



By a. O. \'. TYMM8 



((ioverniuHiit Kcsearch Scholar, Bioloj^ical l)ej)arti(it>iit, University of 



Melbounio). 



(Willi Plates XVni.-XXlV.). 



[Rejul 12th Decomb.-r, 1912]. 



A. Introduction. 

 li. Adult Structure. 



i. External A.spect. 

 ii. Detailed Description. 

 C Euihryonic Development, 

 iii. Cleueral Survey. 



iv. Developing Farts at Different Stashes. 

 V. Post-embryonic < 'hnnij^es. 



D. liiterature. 



E. Descrijjtion of Plates and llefereuce Letters. 



Introduction. 



The material for this investigation consisted of a large number 

 of syringes of the adult connnon fowl, and of sets of longitudinal 

 and ti'ansverse serial .sections of cliick unil)ry()s, in all stages, from 

 nine days' incul)ation until the time of hati-liing, examined in 

 icgard i(( llic structui'e and developnii'iit of the syrinx; and lastly, 

 end)ryos at several stages were dissected, especialh' in regard to the 

 relation of the respii-atory air sacs to the syrinx. • 



The work was carried on in the JJiological Laboratory of the 

 Melboujne University, at the suggestion, and under the dirtntion, 

 «)f Pr(d'essor Baldwin Spencer, to whom I owe many thanks. Thanks 

 aie also due to Dr. T. S. Hall and Dr. Sweet, for assistance and 

 advice, and to .\fr. .T. Brake, and all others who have helped in 

 various wavs. • 



