298 THE EYE IN EVOLUTION 



Figs. 330 and 331. — The Falcifobm Process, in an Adult Teleostean 



(Trout). 



Fig. 330. — The macroscoiDic intra-ocular ajDpearance of the posterior half of 

 the globe seen from the front. F, falciform process. 



Fig. 331. — Section across the region of the fcetal fissure. H, vascular mesoderm 

 of the falciform process ; E. neuro-ectoderm of the wall of the oj^tic cup 

 (Mann, after von Szily). 



other choroidal constituents (pigment cells and vessels) have been cut 

 down to a minimum (Walls, 1942). 



The CHOROIDAL C4LAND, an organ so called by Cuvier (1805) but 

 with no structural or functional affinities to a gland, is a peculiar 

 vascular formation lying in the posterior part of the globe between 

 the choioid and the sclera (Figs. 328-9). It is highly vascularized, 

 consistiim essentially of a mass of juxta-apposed capillaries sometimes 

 forming a ring around the optic nerve, more frequently horse-shoe-shaped 

 in whicii se the open end of the horse-shoe, ventral to the nerve, may 



