PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 



157 



MATERIAL EXAMINED 



Palau Islands: Barrier reef 8 mi. NW. of Koror Island; GVP sta. 2~). One 

 colony (USNM 11378). 



Descrii'tion. — xl small, 7 mm. x7 mm. piece of colony from the 

 Palau Islands was examined, it contained several zooids embedded in 

 the test, situated obliquely. 



Test hard, gelatinous, thin but very tough, translucent, milky Avhite. 

 ]\Iany embedded small purplish-brown ampullae scattered near sur- 

 face of colony, some especially minute and arranged regularly in a 

 circle around each branchial aperture (fig. 62a) . Zooids up to 3.5 mm. 

 in length. Anterior part of body surrounding plainly margined 



Figure 62. — Botrylloides tyreum Hcrdman: a, part of colony surface sliowiiig arrangement 

 of pigmented ampullae; b, left side of zooid; c, ciliated groove; d, pyloric caecum and 

 vessels connecting it with proximal portion of rectum; e, left testis;/, right testis. 



