B.ELATIONS OF RHABDOPLEFEA. 



583 



Schematic and hypothetical diagram of Ehdbdopleura. a. Lophophore, with 

 origin of tentacles ; b. Shield ; c. Mouth ; d. CEsophagus ; e. Stomach ; /. In- 

 testine ; g. Anal orifice ; h h. Endocyst ; i. Contractile cord ; Jc. Commence- 

 ment of the chitinous rod ; I. External chitinous tube. 



The representative of the endocyst is indicated by the broad dark line. 



