system is cushioned below by the subneural sinus 



bove by the cuter perihaemal ring. 



The stomach, which for so long a period has been 

 at a stand still in its development, an to 

 grow its sides pushing out bet cor: the spigastric 



::; cavities. The lumei 

 stomach and oesopli red ,Fi ;;.';- i.s . 



landular structure which makes the walls or the 

 stomach co cor.plics.t~d in the s not begun 

 tc form in "H" the voile being simple and one cell 

 in thickness. 



No figure of "H" as a whole object hoc been 



reason that the skeletal plates should 

 be included end material adequate tc a complete study 

 of them is net in rr.y pesession. 



