1896.] OBLIQUE SEPTA IN THE PASSERINES. 227 
Diagrammatic transverse section through the thorax of a Duck. 
L., L., lungs; L.L., R.L., left and right liver-lobes; 0.S., oblique septum ; 
A,S., horizontal septum. 
I 
) | 
a 
i 
Diagrammatic transverse section through the thorax of a Crow 
(Corvus capellanus). 
a, rudiments of sternal attachment of oblique septum, The other 
lettering as in fig. 1. 
15* 
