264 



THE EYE IN EVOLUTION 



Figs. 276 and 277. — The Eye of Lampetra planeri. 



SC DC DE 



/ 



CM 

 VS 



Fig. 276. 



DC SC 



CM 



The outline of the large circular lens is seen as a dark circle ; it has 

 slipped backwards and the inner part of the lens has fallen out of the section 

 (Mallory's phospho-tungstic acid haematoxylin ( X 34) (Katharine Tansley). 



Ch, choroid (black) ; CM, cornealis muscle ; DC, dermal cornea ; DE, 

 dermal epithelium ; ER, external rectus ; 10, inferior oblique ; IR, internal 

 rectu:: ON, optic nerve ; RCT, retrochoroidal tissue ; Sc, sclera ; SC, 

 scleral j nea ; VS, venous sinuses. 



