142 



ON THE ANATOMY OF THE EURYL^EMID^E. 



P. Z. S. 1880, 

 p. 385. 



evident in front (vide fig. 2), but is also visible when dry behind ; it is 

 apparently due to the accumulation of tissue inside, forming the outer 

 boundary of each glottis. The third and fourth rings are slightly concave 

 upwards : they are deeper, especially behind, thinning away towards the 

 front, than those that preceded them. The fifth and other succeeding 

 rings are typical, unmodified bronchial rings, which more and more 

 encroach upon the membrane*, tympaniformis,'a,nd. eventually almost overlap 

 behind. The second and succeeding semirings are more or less incompletely 

 ossified at their ends. 



In Oymbirhynchus macrorhynchus (figs. 3-5), the syrinx is constructed 



Fig. 3. 



Syrinx of CymbirJiynchus, viewed from in front, X 5. 

 Fig. 4. Fig. 5. 



Fig. 4. The same, X 5, from the side, to show the insertion of the intrinsic syringeal 

 muscle into the middle of the first bronchial semiring. The stcrnotrachcalis is 

 cut short. 



Fig. 5. The same, X 5, from behind, to show the pessulus. 



