PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 167 



In branchial sac approximately 30 stigmatal rows (28 in one ex- 

 amined specimen) and two plications on each side. Inner longitudinal 

 vessels arranged as follows (D = dorsal, V= ventral) : 



Left D 4 (18) 6 (15) 8 V 



Right D 5 (15) 9 (13) 11 V 



Transverse vessels and parastigmatic vessels alternate regularly; 3 

 stigmata in each ordinary mesh, but up to 6 or 8 in meshes along 

 endostyle; stigmata elongated. Tentacles about 20, larger and smaller 

 ones differentiated. Ciliated groove an elongated longitudinal slit. 

 Second intestinal loop very shallow, axis passes through cardiac por- 

 tion of stomach ; rectum rather long; anal margin thickened, but plain. 

 Stomach roughly globular with about two dozen longitudinal plica- 

 tions on surface; no pyloric caecum. An endocarp enclosed in first 

 intestinal loop. In specimens examined, 6-16 ovaries and 210-273 

 testes found on each side. Testes small oval follicles; ovaries much 

 larger than testes and generally each contain a single ovum ; margin 

 of aperture of oviduct undulating. 



Up to 23 very large larvae in each dissected specimen. Trunk oval 

 in shape, up to 1.2 mm. in length, tail attains 3 mm. in length; thus 

 total length of larger larvae may attain 4.2 mm. Three attachment 

 processes arranged in triangle. About two dozen elongated ampullae 

 faintly discerned on surface, all very long, covering nearly entire tnmk. 



82. Polyandrocarpa (Eusynstyela) sp. aff. monotestis Tokioka 



Figure 67 

 Polyandrocarpa (Eusynstyela) monotestis Tokioka, 1953a, p. 247, pi. 4S, figs. 1-7. 



MATERIAL EXAMINED 



China : Probably Amoy ; received October 12, 1932, from T. Y. Chen, Univer- 

 sity of Amoy; sta. 3, no further data. One colony (USNM 1153G). 



Description. — A single massive colony, 33 mm. X 17 mm. in extent 

 and 7 mm. in height. Probably an encrusting colony enclosing some- 

 thing wholly within the mass, the real thickness of the layer of a single 

 row of zooids may be about 4 mm. Test gelatinous, tough, opaque and 

 milky white. Surface finely wrinkled, carrying a small amount of 

 mud and divided into a number of elliptical areas 3-4 mm. in length, 

 on each of which branchial and atrial apertures of respective zooids 

 are opened ; both apertures 4-lobed. Zooids situated slightly inclined 

 towards ventral side, about 5 mm. in length when taken out of test and 

 freely expanded. Branchial aperture terminal, posterior margin of 

 short atrial siphon situated at middle of body. Mantle delicate, pale 

 yellowish brown. About 10 small endocarps on inner surface of man- 

 tle on each side. Fine tentacles present on atrial velimi. Four 

 branchial folds on each side, of which second and fouith do not form 



