mi: OK..A.NS 





. ascertained l>y t i,. 



has .still further elucidited the 1 lit ejVst \ng pro- 



cesses l'\ the construction "t \\ax in 'he coiri 

 niialian einliryos. 



to be seen from the -till 



111 I he model (Ii. 

 -eiincircnlar canal- an- .levelop d hy the ] 



of i he wall of the sac, \\hiih have tin- form "f thin p,/ke 



\\ith a 



>emicircultr outline. ^^^^ 



The marginal p,n 



. Mich exairina- 

 tion now Incomes 

 con sid e ra hi \ en- 

 larged, whereas the 

 remaining portions 



of the t\\o epithelial 

 layers cMine into close 





contact ami I't-^iii to 

 t'uso. A^ th.- n->uli 

 of thi- .simple process 

 the enlargement ai 



tin- margin and tin- 

 fusion of the walls 

 which takes place in 

 thf middle there is 



Fig. 278. Cross section through half of the head of a foetal 

 , . Sheep 2 cm. long, in the region of the labyrinth, afirr 



' ttnal i wh ' 1 ' oomnm- Iiri , 2ifcna2.Ii. 



nirates at t WO places Heoesros labjrrinthi ; T&, kb, Tertical and horia>nUl aeini- 



... , ir canals; T, ut i ioultu; /. inward-projecting fold. 



with the Original Juaand 



by Of the \eMcle. u ' -; pc, ganglion cochlr. 



\t one of it> open 



the canal i- early 



and <int). The middle part, in \\hich t 



.soon li.sapprars. the epithelial n.. 'neiii^r ln\>k-n tin- 



growth of the c(.nnecti\e t 



There exists an interesting ditl'erem-e hetween the.l \el,pmentof 

 the horizontal and the tWO v.-i I ieal canal-, \\hich wa- ! by 



KHMSK. \\"heieas the hori/ontal canal is e-tai a small 



pocket ly itself i 'I canals ai*ise to<j> 



'.'ket-liki' ' 



