146 



UNITED STATES NATIONAL MUSEUM BULLETIN 251 





Figure 54. — Ascidia papulosa, new species: a, right side of holotype; b, optical section of 

 middle part of test; c, right side of mantle body; d, left side of same; e, ciliated groove; 

 /, a supporting process of inner longitudinal vessels. 



simply U-shaped, situated in front of dorsal gan<Tlion, separated from 

 ganglion by distance of 1.5 times the length of the ganglion. Dorsal 

 lamina ribbed, tips of ribs project from laminal margin. Anterior 

 margin of intestinal loop reaches middle of range between both 

 siphons. Second intestinal loop very deep, axis passes approximately 

 through middle of roundish stomach. Anal margin plain. Ovary 

 situated at inner part of first intestinal loop ; testicular follicles spread 

 over proximal half of ventral branch of first intestinal loop and an- 

 terior margin of stomach. 



Remarks. — The structure of the alimentary system in the present 

 specimen resembles that of Ascidia longistriata Hartmeyer, 1906, al- 



