362 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Family POLYCITORIDAE Michaelsen. 1904 [ = DISTOMIDAE Giard, 
1872]. 
Genus Polycitor Renier, 1804 [= Distoma Savigny, 1816]. 
Colony thick and fleshy, sometimes capitate or pedunculate. Zooids 
usually not arranged in systems. Xo calcareous s])icules. Branchial 
and atrial ajiertures six-lobed, the atrial aperture being situated at the 
end of a short anteriorly directed tube. Intermediate transverse 
vessels crossing the middle of the branchial stigmata are not present, 
nor is a brood pouch developed, as in the following genus (Holozoa). 
The intestinal loop is (usually at least) twisted, bringing the stomach 
to the dorsal side and the reproductive organs to the left side of the 
abdomen. 
The species here described belongs to the subgenus Eudistoma 
CauUery, a group which is perhaps deserving of generic rank. Its 
distinguishing characters are a small number of rows (usually four) 
of stigmata and a smooth-walled stomach. 
Polycitor kiikenthali (Gottschaldt). 
Text-figs. 4, 5. 
1894. CoIeUa Jaikenfhali Gottschaldt. Jena Zeitschr., vol. 28, p. 363, pi. 
24. fig. 6. 
1903. Distnmus kukenfhali Hartmeyer, in Romer and Schaudinn, Fauna Arc- 
tica, vol. 3, p. 311, pi. 14, fig. 6. 
1907. Disiomus kukenthali Redikorzew, Ann. Mas. Zool. Acad. Imp. Sci. St. 
Petersbourg, vol. 11, pp. 148, 151, 1.53. 
1908. Distnmus kukenthali Redikorzew, Trav. Soc. Nat. St. Petersbourg, 
vol. 39, pp. 20, 33. 
1909. Poh/citor kukenthali Hartmeyer. Bronn's Tier-reich, vol. 3, suppl., p. 
1432. 
The colony is commonly greater in height than in breadth, and of 
more or less ovate, acorn-shaped, or pear-shaped form, and is attached 
at the larger end by a distinctly narrowed base which may be pro- 
duced into a short, stout peduncle. A few colonies are so elongated 
as to be more or less finger-shaped, and in such cases are usually 
somewhat curved. The two largest colonies in the collection measure 
40 mm. in height by 20 mm. in width, and 40 mm. in height by 29 mm. 
in greatest width respectively. They are shown in text-fig. 4. An- 
other colony was about 00 mm. long, but comparatively slender. 
