nn: ORG I 483 



the epithelial lining .f i . in tin- tl. 



which Mil-rounds tin- pupil ami \\liich remain^ >mooth, i h- j 

 t-j.it helium (avea)of i In- iri>. < 'on-e^uent ly t hereure now to 

 irui>hed on tin- >ec,.nd;.!\ ..ptir cup tln.-o regions, as retinal. -i 

 :uul iriilal part>. To each of the.-.- territories the <' 

 connect i\e t i.-Mie, ami especially \vhicli liccomes the middle 



tunic of the eye, is adapted in a particular manner; here it furnishes 

 the connect i\e t i-> IK- plate M!' the iii- with 

 lature. there the ci>nm-cti\. .-\virk "t the ciliary body 



i he ciliary muscle, ami in the third region the vax-ular 

 \\itli the chorincapillaris ami lamina t 



In the l-\el ( ipnn-nt of t he optic cup there arose on U wall 



rare (\\^. . which marks the place at which the t'i 



ment of the viti'eou.- ho.ly -rew into the interior of the cup. V. 

 is the ultimate fate of this lis^me, whii-h i> u>ually i-ef.-rre.l 

 literal iir. M choToidfistl 



It is for a time easily recc^ni-ahle. after j. uis been 



depo>ite,l in the outer lamella of the opt u- cup. It then appears on 

 the lower median side of the e\vhall as a clear, unpi^meute.l gfa 

 \\hich reaclu s forward from tin- entrance of 

 niaririn of the pupil. 



The -ruitl iiu was 



at a time when tin- formation of the optic cup was not adequately known, 



when the pigmented i-pithrlium was still <\Q&. Therefore 



in tlic al)sciice of piiriiu-iit vcball 



it was supposed that a defect of the choroidea a chon 



.'I. 



Th- rwar.U .li-a|.|n | I .. : MIIV ,,f the v\ 



1 l.y the fu>i..n of I and the deposit imi of piirm.-nt in the 



raphe. In the Chick this takes place on the ninth 



during the sixth or seventh n 



In still another r->pv! i- the ch,.roid fissure noteworthy. 



Iu many \ '. ilar 



].roce of the i-hor(idea j;ro \VN through the figure. 

 into the vitreous hody and t here forms a lamellar projection, which 

 Mends from the optic nerve to the lens. In has rece 



the name " p.eeteii." l>eeau>e it i> f.-l led into numerous parallel ridges. 

 It consist > almo>t entir.ly of th.- walls of blood-vessels, which are 

 held together ly a -mall amount of a black pi^mented c 



tilssike. 



In ^lammals such a growth into th. ing 



