434 



THE EYE IN EVOLUTION 



Figs. 543 and 544. — The Ciliary Body of Monotremes. 



Fig. 543. — The ciliary body of the jjlatypus. 

 Note the large ciliary venous sinus in the connective tissue filling the 

 angle of the anterior chamber. The small annular pad in the lens is seen to 

 the right (O'Day). 



Fig. 544. — The ciliary body of tVie echidna. 

 The ciliai'v venous sinus is much smaller (O'Day). 



