TUNICATA 



1. Ciona. Animal removed from its test and drawn in side view. Mouth; atrial aperture; 

 ganglion ; longitudinal muscles of body-wall ; red pigment spot marking termination of vas deferens ; 

 point of origin of test vessels. 



2. Atrial cavity and body cavity opened along the dorsal middle line; body wall separated from 

 the pharynx by cutting the cords passing from one to the other. Pharynx ; oesophagus leading into 

 stomach ; intestine with typhlosole ; rectum ; heart in pericardium ; oviduct and vans deferens opening 

 into atrial cavity. 



92 



