TUNICATA 



671 



Fig. 469. Ciona intestinalis dissected from the left side. The atrial cavity and 

 the pharynx have both been opened by longitudinal incisions, and part of 

 the intestine cut away. An. anus ; at. op. atrial opening; d.tub. dorsal tubercle; 

 est. endostyle; est.' caecum of the same; h. heart; int. intestine; lang. languet; 

 M. mouth; nitl. mantle; od. oviduct; oe. opening from pharynx to oeso- 

 phagus; ov. ovary; ph. pharynx; pph. peripharyngeal ridges and groove; 

 rm. rectum ; sn.gl. subneural gland ; st. stomach ; ten. tentacles ; vas de. vas 

 deferens. 



