448 FRANK E. BEDDARD. 
batus, a sac containing ‘ copulatory ” seta, which has equally 
thick, many-layered, muscular walls. 
In Teleudrilus (Rosa, 35) the male genital pore is median 
and unpaired. The bursa copulatrix forms a large sac with 
very thick muscular walls and narrow lumen; this is continued 
into another very thick-walled sac, which Rosa terms “ bulbo 
propulsore,’’ and suggests as the equivalent of the ‘‘Y-shaped 
appendages” of Hudrilus; at the junction of this with the 
bursa open the prostates, whose structure appears to be identical 
with the corresponding organs in Eudrilus. 
Apart from the median unpaired aperture, which is found in no 
other Oligochet except Bothrioneuron (Stolé, 38), there is, 
as Rosa has pointed out, a general correspondence between the 
efferent and copulatory apparatus of Teleudrilus and of 
Eudrilus. The immense thickening of the walls of the 
bursa have, so to speak, obliterated the distinction between the 
bursa and the penis, which has therefore disappeared in 
Teleudrilus. The result is that the copulatory organs of 
Teleudrilus resemble more closely those of such forms as 
Pericheta. 
The female organs of Eudrilus are chiefly remarkable 
on account of the continuity of the ovary and oviduct, 
and the communication between the oviduct and the sperma- 
theca. Teleudrilus is, again, somewhat intermediate in 
these particulars between Eudrilus and other Karthworms. 
The discovery of this genus, as Rosa points out, renders less 
necessary the separation of Eudrilus into a distinct group. 
At the same time I do not think that Dr. Rosa lays sufficient 
stress upon some of the peculiarities in the organisation of 
these two types; and I cannot agree with the way in which he 
interprets some of the structural features of Eudrilus. 
The differences in structure between the female reproductive 
organs of Teleudrilus and Eudrilus are in reality somewhat 
greater than would appear from a comparison of Dr. Rosa’s 
paper with my own. 
In my paper I described and figured a pair of problematic 
bodies in the thirteenth segment, which are contained in a 
