122 UNITED STATES NATIONAL IVIUSEUM BULLETIN 251 



53. Eudistonia viride Tokioka 



Eudistoma viridis Tokioka, 19551), p. 49, pi. 4, figs. 1-5. 



MATERIAL EXAMINED 



Palau Islands : Barrier reef 8 mi. NW. of Koror Island ; GVF sta. 25. Five 

 colonies attached to reef coral debris (USNM 11389). — Ngaremdiu, eastern side 

 of Urukthapel ; GVF sta. 53. One colony (USNM 11457) .—Fringing reef of small 

 island in lagoon (Meharehar) of Eil Malk; GVF sta. 252. Ten colonies (USNM 

 11430), attached to basal part of Polycarpa cryptocarpa Sluiter (USNM 11433). 



Description. — Sixteen colonies from the Palau Islands were ex- 

 amined ; larger ones are 15 mm. X 8 mm. in extent or 23 mm. in length 

 and about 5 mm. in thickness or height. Test translucent and gray- 

 ish green. Zooids deep green, especially dark at siphonal region of 

 thorax and near area where stomach is situated in abdomen. Stigmata 

 25-30 in each of three rows. 



54. Eudistoma marianense, new species 



Figure 43 



HoLOTYi'E. — USNM 11470: Marianas Islands; entrance of Tanapag 

 Harbor, lagoon west of Saipan ; 36-42 feet ; patch of dead coral-algal 

 rock on very coarse-grained limesand bottom ; P. E. Cloud, sta. D-8, 

 May 13, 1949. 



Paratype.— USNM 11810 : same data. 



Description. — Two colonies are described from Saipan Island, the 

 holotype, 12 mm. X 8 mm., and the paratype, 7 mm. X 4 mm. in extent, 

 and 4-7 mm. in height. They are roughly oval in outline, upper sur- 

 face nearly even and smooth. Test soft, gelatinous, translucent, milky 

 white, free from foreign matter. No sand grains embedded within 

 tissue, but some fecal pellets are contained in lacunae system and are 

 seen from surface through test. Zooids strongly contracted, in an 

 imperfectly preserved condition ; color completely faded. Largest of 

 examined zooids 5 mm, in length, thorax occupies one-third of total 

 length. Both apertures 6-lobed, atrial siphon fairly long. About 10 

 longitudinal and about 25 transverse muscles on eacli side. Tentacles 

 16, larger and smaller ones. Ciliated groove a short longitudinal slit. 

 About a dozen (?) stigmata in each of three rows. Stomach located 

 near middle of abdomen, both hind stomach and midintestine are dis- 

 tinct. Proximal end of rectum is constricted from midintestine, but 

 no caecum formed there. Testicular follicles as many as 19 in ex- 

 amined zooids, spread over left side of intestinal loop posterior to 

 pyloric end of stomach. 



Trunk of larvae elongated, 1.5 mm. in examined samples. Three 

 attachment processes elongate-oval in outline, arranged lineally. One 

 median prominence between dorsal and middle attachment processes, 

 two between middle and ventral ones. Two pigment flecks of sensory 

 organ are arranged obliquely and situated at level of approximately 

 ono-third of body length from posterior end. 



