EMBRYOLOGY OF THE LOWER VERTEBRATES n. 

 , projecting from the ventral side of the trunk near its hind 

 all' 



.... /<* 



coel 



sa 



coel 



alh 



spl 



a.c 



, Ilii :-,! rating lli.- aiTan^riiH-nt ol .uuiiioii, allanttii.s. .-(... in tin- Foul. 

 \;i., i.iiiie, 1908.) 



A, fourth la\ ; li, ninth i..\. '/.., ainniot ic caxity; nib, albumen; nil, allaiiton- ca\it\ ; <ill.*t, 



, <<>.!, ,ini> , BOOI mmbnne ; , Mrotmniofctfl 



isthmus; >/-/, >]il:iiicliiin|.l' . :l.-llin.- nninl>rain- ; //, \olk; 1, niil.'i \v:dl nf iillant' 



u.iii i)t .ii; :: 



