XIII 



PHYLUM CHORDATA 



129 



below); guarding 



the entrance to the latter is a curtain-like 





i S a;E 



■as «■' 



O o- 



. ci t 







xi a. "'2 a <5 '-^ 



O 



3 g g -S --- a 3 



•o 'E "S ^ •^ ? « -d ,- „ 



T) C.3 S^ a s g j; ca 3 

 c?^ ..S--3..'3.5 



ll»lll:^ 



CSe 



Qj ; 



•as B B ft ci . So = ;„".H 



^ ^ ;- o g .3 



H-clT^ 3^^-< -3 ' ,^ 

 2rt'^03!3.5^-'-" 



^ S ?§•-? S.S B s: § a 



■Se-^j5S-^ft2..Mg 

 s °».t; & . " " «j si 



'S° g •■g.*0 3 s„ 



° a 



•3g^- 



; s>"^ 



« 1 



o o __ +3 bo c " 

 B.'O'S » rt B ' 



Trt rt 3 o ..+J 



oi"S a'g 2 s g 

 SsS 





5-^ ^ 









I „ ft3_ ..^„ 

 l'^rfCJd^33'^ 

 o a-,-±! 3 3^ » S 



■~s; 



■O^'fl 3 i 



fold, the velum (vl.). The gullet bends over the pericardium and 

 enters the intestine {int.) by a valvular aperture. The intestine 

 VOL. II I 



