TUNICATA 



593 



» 



cl.tuh. 



Fig. 444. 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.tuh. dorsal tubercle ; 

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

 M. mouth ; mtl. mantle ; od. oviduct ; oe. opening from pharynx to oesophagus ; 

 ov. ovary; ph. pharynx; pph. peripharyngeal ridges and groove; rtti. rectum; 

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



38 



