PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 159 



Figure 63. — Botrylloides viulaceus Oka: a, small piece of colony from the Palau Islands; 

 b, left side of zooid from same. 



and zooids increase in number. Stigmatal rows 10 on left, 11 on 

 right side. Usually dorsal edge of second row does not reach median 

 line, as example, in one zooid it falls the distance of four stigmata 

 from the median line on the right side; exceptionally it may reach 

 the dorsomedian line, as on left side of another examined zooid. 

 Posterior-most row rather rudimentary. Stigmata arranged 

 ( D = dorsal, V = vent ra 1 ) : I ) 4-G ( 1 ) 8-4 ( 1 ) 8-4 ( 1 ) 3 V. Tent acles 8, 

 larger and smaller ones alternate regularly. Ciliated groove an oval 

 orifice. Anterior margin of intestinal looj^ reaches seventh transverse 

 vessel, second intestinal loop very distinct, axis passes near cardiac 



