634 DR. P. CHALMERS MITCHELL ON THE 



Text-fig. 72. 



[Dec. 17, 



Wing-structure of Otis tarda. 



Diagram of the distal secondary quills and coverts, showing the diastataxir 



condition. General description and lettering as in text-figure 70. 



I'L. Plica, or membranous fold binding the carpal remex to the distal secondary. 



Text-fig. 73. 



C.C 



Wing-structure of Ehinochetus jvbatv*. 



Diagram of the secondary quills and coverts, snowing cvlaxU condition. 

 General description and lettering as in text-figure 70. 



