396 KJERSCHOW AGERSBORG 
ed in much less iiumbers than C. kincaidi^ i. e., in a ratio 
of ca. 1:50. They were from 5 to 9 mm. in total length, 
and brownish rod in color. Head sometimes truncated but 
at times lanceolate; the posterior end likewise, truncate or 
lanceolate. The body, barrel-shaped with a gentle tapering 
toward each end. Three ciliated grooves which encircle the 
organism présent: one 
on the posterior part 
of the head, the second 
a little past the mid- 
dle of the trunk (fig. 
3, 4,) and the third is 
near the posterior end. 
Hood:—The head 
is about one third 
the length of the bo¬ 
dy; it bears two 
short latéral, truncat¬ 
ed, tentacles, set 
with at least three 
transparent non-vi- 
bratile, bristle-like 
processes. Immedia- 
telv in front of these 
c/ 
is the ciliated groove 
which encircles the 
head. From this the 
head tapers gently, 
when the animal is 
relaxed, intotwo arch- 
ed and annulated 
processes, the tentacles. These were nearly ail the time 
completely withdrawn, by a process of telescoping, into the 
head, and frequently only the tips were visible; they were^ 
very easily stimulated and exceedingly rapidly withdrawn. 
Between the base of the tentacles, antero-ventrahy, is a 
small blunt lobe. Mouth vertical, probosciform. Around 
the edge of the proboscis are six vibratile long bristle-like 
Fig. 3.—Drawing from life of Trichocijclus hansi- 
ne'énsis [sp. nov.) ventral view; the right dorsal 
tentacle is almost completely contracted. x 7. 
(For complété detail explanation see text.) 
