206 W. BLAXLAND BENHAM. 
In Telmatodrilus there are eight or more small isolated 
prostates. 
The atrium is relatively short in Tubifex and Ilyo- 
drilus,! where it is glandular throughout, and there is no 
distinction of a non-glandular portion or atrial duct. 
In Limnodrilus there is a short non-glandular region, 
which is larger in Spirosperma. 
In Psammoryctes (see below) and Heterocheta?® the 
glandular region is relatively small, and the non-glandular 
portions greatly extended. 
I append figures of the chitinous coat or tube of the penis 
(Pl. VII, fig. 37), by which I understand a thick, refracting 
modification of the cuticle, such that it can be readily recog- 
nised. 
Such a penial tube is absent in Tubifex and Ilyo- 
drilus.® It is short and nearly cylindrical in Spirosperma 
(37, c), Psammoryctes (37, c), and Heterocheta (PI. 
VI, fig. 21). The last, however, has the outer edge turned 
out so as to form a rim. 
In Telmatodrilus (87, 6) and Hemitubifex* (fig. 37, a) 
it is a short truncated cone (I cannot find a description or 
figure of this part in Clitellio). 
In Limnodrilus (including therein Camptodrilus, 
Eisen) the tube is usually very long and relatively narrow, 
cylindrical, or constricted near the middle, or trumpet-shaped 
(figs. d,e, f). In L. Hoffmeisteri it has a peculiar free 
end (37, g), and in L. silvani it is flask-shaped (fig. 87, h). 
1 Stole figures the male apparatus of Ilyodrilus: the atrium appears 
spherical, and is surrounded by a layer of large cells, which Beddard would 
call the ‘‘ prostate,’ resembling that of Stylaria, &e. 
2 Lophocheta resembles these two genera. Bothrioneuron presents 
several peculiarities in the male apparatus. 
3 As also in Bothrioneuron. 
4 In Lophocheta also. 
