361 
Huxleyi, but its anterior distal angle is more deeply cut off; the 
posterior flagellum is scarcely one third or scarcely one fourth shor- 
ter than that on the upper branch, while it is a little more than 
twice as long as the anterior flagellum. The globulus is very small, 
and its transverse diameter conspicuously shorter than that of the 
upper branch; the stalk is exceedingly short. 
Trunk (fig. 2b). Robust. — The fifth pair of tactile setæ is 
not quite two thirds longer than the transverse diameter of its seg- 
ment; the fourth pair is two thirds as long as the fifth; all three 
posterior pairs of tactile setæ otherwise as in P. Huæleyi. — The 
two submedian pairs of setæ on the last segment somewhat longer 
than in that species, the posterior of these pairs about half as long 
as the posterior breadth of the segment. 
Anal Segment (fig. 2c). The tergum is scarcely produced 
posteriorly; its setæ almost as in P. Huæleyi with the exception of 
the submedian pair being shorter, almost only one third of the 
length of the lateral pair. — The styli åre as long as in P. Huæleyi, 
but much thinner, scarcely as thick as the outer branches of the 
" anal plate. — The sternum is posteriorly cut off; its setæ as in 
P. Huæleyi. — The anal plate presents some differences: the outer 
branches originate more distant from the base of the plate and are 
only a little shorter than the inner pair; these branches are shorter. 
than in P. Huæleyi, rather narrow, tapering from the base to the 
middle, while the posterior half is cylindrical, their apical part is 
marked off by å transverse suture (or articulation), and this part 
is shaped as a small, round or ovate knot. 
Legs. They are somewhat shorter and more robust than in 
P. Huxleyi, the last pair (fig. 2 d) otherwise as in that species. 
Copulatory Organs (fig. 2 f). Seen from in front they are 
thick, eylindrical in two thirds of the length, while the distal third 
is obliquely cut off. 
Length. Both specimens are much contracted; one of them 
measures "7 mm., the other "84 mm. 
