132 
M. Kowalewski: 
distinctly spatulate. The most important characteristic of the new 
species is the large penial mass, consisting of a deep skin pouch 
surrounded by a broad muscle layer in which the penis lies. This 
is as long (190 — 220 f) as about the half transversal diameter of 
the.segment XI. It is of conical shape with a long thinner endpart and 
is enveloped by a distinct chitinous sheath of brownish colour in the 
distal half. The atrium in older specimens has a very much thinner 
epithelial wall and consequently a much larger lumen than repre¬ 
sented in Fig. 4. In spite of the relatively advanced maturity of 
the animals in question, no trace of spermathecae was found in 
them. 
III. Tubifex templetoni Southern 1909 . 
(Fig-. 6-10): 
On the description of the atrium of this species, as given by 
Southern, the author remarks that the epithelial wall of the cil¬ 
iated part of this organ is glandular (similar in its appearance to 
the prostata) and is enveloped by the same muscle layer as the 
rest. While the ciliated part in living animals is separated from the 
nonciliated part of the atrium by a distinct constriction, in the con¬ 
served specimens both parts are quite continuous. The contracted 
atrium however differs essentially from the stretched one; in the 
first case it is several times broader and about two times shorter 
than the vas deferens , in the second case it resembles a tube of 
the same diameter as the vas deferens , but is much longer. 
IV. On the tubes of Stylodrilus hallissyi Southern 1909 . 
The author describes the tubes in which the representatives of 
this species live. 
Explanation of plate. 
All the figures, with the exception of fig. 9, were made from conserved ani¬ 
mals with the aid of a camera lucida. 
Lettering : 
at. atrium (at/ ciliated, at." its non ciliated part); bm. bulbus musculosus; 
d. ej. ductus ejaculatorius; dis. dissepimentum ; inf. infundibulum seminale; ovd. 
oviductus; p. penis; pr. prostata; spth. spermatheca ( spth. s. spermatheca sup¬ 
plementary); V; def. vas deferens. 
