5G 



THE MYOLOGY OF THE RAVEN. 



Mammalia, the function of this muscle is to raise the 

 superior eye-lid. 



39. TJie depressor palj^ehrce inferioris, as has already 

 been stated, is easily found. Its fibres arc attached 

 along the lower margin of the interorbital vacuity. 

 From this line (Fig. 22) they pass outwards beneath the 

 eyeball, to become inserted into the lower lid, where they 



:^^' ../ 



:V>V 



paZ. tyiiJ^, 



T- e*-. 



Fig. 22. — Kiglit lateral aspect of skull of Kavcii, to sliow exact origins of the 

 jirincijial imiscles of the eje, and the tensor tympani. Life-size, by 

 the author. Lettering as in Fig. 20, with t.t., tensor tympani ; o.ji*. , 

 orbicularis palpebrarum; /, lacrynial bone; I. pal. sup. , levator j>al 

 pebrffi superioris ; d. pal. inf., depressor palpebraj inferioris; r.inj., 

 rectus inferior. 



antagonize to a certain extent the orbicularis palpe- 

 brarum, as by their contraction this integumental veil to 

 the organ of sight, the lower lid, is withdrawn. Owen 

 tells us that this muscle is also found in the Crocodile, 

 and I dare say in other Sauropsida. In the Raven it 

 is the only lid of the three which is reinforced by a 



