PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 139 



Figure 50. — Ascidia sydneiensis samea (Oka): a, 65 mm. specimen; b, right side of mantle 

 body; c, left side of mantle body; d, one of the supporting prominences of inner longitudinal 

 vessels; e, ciliated groove. 



tiidinal and transverse vessels very conspicuous, intermediate papillae 

 absent. Roughly one plication in each interval between longitudinal 

 vessels, 8 to 9 elongated stigmata seen in each plication. Tentacles 

 about 40, the arrangement — large small medium small large — may be 

 seen at some places. Ciliated groove consists of two elongated grooves 

 curving complicated! y. Dorsal lamina ribbed, although edges of ribs 

 scarcely project from laminal margin. Two pontid shrimps found in 

 branchial sac. Anterior margin of intestinal loop situated at level of 

 middle of base of atrial siphon. Esophagus moderate in length, 

 opens roughly at middle of distance between atrial siphon and pos- 

 terior end of body. Stomach rather elongated with several longitudi- 

 nal plications seen faintly through wall. Second intestinal loop very 

 deep, its axis passes through pyloric half of stomach. Margin of anal 

 lobes plain. Male and female gonads show configuration generally 

 seen in usual species of Ascidia, testicular follicles spread over proxi- 

 mal branch of second intestinal loop and cardiac half of stomach. 



206-191—67^—10 



