PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 121 



finger-shaped and situated on left side displaced from dorsoniedian 

 line for distance of approximately four stigmata. Tentacles 16( ?) in 

 an examined zooid, exact number very difiicult to determine. Ciliated 

 groove a small oval opening. Stomach smoothly surfaced, situated 

 very near posterior end of abdomen. PImd stomach as long as stomach ; 

 middle intestine whitish and separated by a slight constriction from 

 proximal end of rectum, which is slightly salmon pinkish ; no caecum 

 formed at proximal portion of rectum. Rectum runs straight to anus 

 which is distinctly bilobed and opens at level of second transverse ves- 

 sel. Ovary situated at level of anterior half of hind stomach. Testic- 

 ular follicles very numerous, up to 83 m an examined zooid, spread 

 over posterior half of stomach and left side of intestinal loop; they ex- 

 tend to right side of intestinal loop or slightly beyond rear end of loop 

 'svlien fully matured. One or two embryos found in incubatory cham- 

 ber. Some zooids infested at genital portion by parasitic copepods. 



Larvae elliptical and about 1 mm. in trunk length. Three attach- 

 ment processes cup-shaped, roundish in outline on surface and ar- 

 ranged lineally. Pigment flecks of sensory organ arranged obliquely. 



Remarks. — The present specimen closely resembles Eudistoma oli- 

 vaceus (Van Name) in the appearance of the colony, but differs in the 

 number of stigmata in each row and in the number of transverse mus- 

 cles on the thorax. E. olivaceu.s has about 25 stigmata, or more, in a 

 row on each side, but with approximately 10 transverse muscles on the 

 thorax. 



52. Eudistoma ainplutn (Sluiler) 



Figure 41a 



Polycitor ampins Sluiter, 1909, p. 21, pi. 2, fig. 3 ; pi. 6, fig. 4. 

 Eudistoma amplus Tokioka, 1950, p. 118, fig. 3. 



MATERIAL EXAMINED 



Pat^u Islands : Iwayama Bay, south eud of Island XV ; GVF sta. 02A. One 

 colouy (USNM 11407).— Iwayama Bay, east side of Oyster Pass; GVF sta. 220. 

 One colony (USNM 11413). 



Description. — Two large colonies from the Palau Islands, 70 

 mm. X 45 mm. and 120 mm. X 40 mm. in extent and 10-16 mm. in thick- 

 ness, grayish olive brown in color, were examined. Test shows charac- 

 teristic structure containing many large bladder cells or capsules. 

 Stellate systems very distinct. Longitudinal muscles 20-25 on each 

 side of thorax. Besides ordinary tentacles, many minute tentacular 

 prominences are densely set on inner surface of proximal half of 

 branchial siphon, making it hardly possible to count tentacles exactly 

 in contracted zooids. 



