PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 47 



both hind stomach and middle intestine distinct. Proximal end of 

 rectum constricted from middle intestine, but without forming caeca. 

 Intestinal loop may be twisted in some zooids, but not so strongly as 

 in species of the genus PolycUmnn. Post abdomen a cl ub-shaped prom- 

 inence issuing from left side of intestinal loop near the posterior end. 

 Ovary situated at or slightly anterior to center of testis ; testicular fol- 

 licles 5-10. Heart situated near rear end of postabdomen, where a 

 long vascular vessel issues. 



Eemarks. — The present species clearly resembles ApUdiopsis foka- 

 raensh Tokiolca from the Tokara Islands near Kyusyu, Japan, both 

 species having about 12 stigmatal rows. However, the present species 

 shows a distinct system of arrangement of the zooids on the surface of 

 the colony, and the thorax is provided with longitudinal muscles so 

 delicate that thoraces are usually found in an extended state, whereas 

 they are usually found contracted strongly in A. tokaraensis because 

 this species is provided with 10-12 strong longitudinal muscles on each 

 side of the thorax. The number of stigmata in each row is much larger 

 in A. tokaraensis (18-20) than in the present new species. Amarou- 

 c'mm variahle Herdman reported by Chin from Amoy may be identical 

 with the present new species as the appearance of the colony of Chin's 

 specimen resembles closely that of the present specimens. 



13. Polyclinum tsutsuii Tokioka 



Figure 14 

 Polyclinum tsutsuii Tokioka, 1954a, p. 240, fig. 1; pi. 18, figs. 1-3. 



MATERIAL EXAMINED 



Philippine Islands : Baliwasan ; W. R. Taylor, sta. 10. One colony attached 

 to a piece of alcyonarian coral ( USNM 11658) . 



Palau Islands : Ngerkuid, west of Eil Malk ; GVF sta. 261. Two colonies 

 (USNM 11395). 



Gilbert Islands: Onotoa Atoll. A. H. Banner, sta. B-8. Two colonies 

 (USNM 11484). 



Description. — Three of the colonies are massive, measuring 

 8 mm. X 4 mm., 10 mm. X 7 mm., and 17 mm. X 5 mm. in extent, and 

 from 4 to 6 mm. in height; a fourth is roughly cylindrical, 2 mm. in 

 diameter and 3 mm. in height. These colonies, except for the last, are 

 encrusted with whitish sand grains over the entire surface or 

 leaving the areas surrounding the common cloacal and branchial aper- 

 tures exposed. The smallest colony from the Gilbert Islands is quite 

 free from any sand grains and consists of several zooids surrounding 

 the central common cloacal aperture (fig. 14«), this and branchial 

 apertures are encircled each by a dark pigmented band. A copepod 

 was found in the test of a colony from the Palau Islands. 



Test soft, gelatinous, translucent or transparent, milky white, faintly 

 brownish or grayish brown and containing no sand grains within. 



