116 
FRANK E. BEDDARD. 
perforates the tissues of the body wall. After this the epi- 
thelial cells which line the vas deferens lose their cilia. The 
sac containing the penial setae (PI. XIII, fig. 1) is a diver- 
ticulum of the atrium (PI. XII, fig. 5, g.), just before the 
junction of the latter with the vas deferens. These facts are 
not only of interest as being unique among Earthworms, and 
as forming a distinguishing feature of the genus Typhaeus, 
but also from the point of view of a comparison with another 
Oligochaet — Ocnerodrilus (see p. 125). 
The ovary is situated in the thirteenth segment (fig. 9, ov.). 
The oviduct is also similar in structure and position to that 
of other Lumbricidae ; it opens on to the exterior in front of 
the veutralmost seta of the ventral pair (PI. XII, fig. 9, od.). 
The spermathecae are situated in the eighth segment, and 
open, as already said, on the boundary line between this segment 
and the one in front. Each spermatheca consists of a large 
thin-walled pouch, and a small diverticulum on each side, 
which is composed of a number of separate diverticula united 
within a common muscular sheath. 
The above account of the anatomy of Typhaeus seems to 
indicate a general resemblance in structure to T. oriental is, 
coupled with certain differences which appear to me to be on 
the whole sufficient to warrant the specific separation of the 
two forms. 
The genital papillae are more numerous in T. orientalis 
than in the present species ; it is true that this character has 
to be used with caution in the discrimination of species, but 
in the species under discussion which is represented by fully 
mature individuals, the differences are so great that I cannot but 
regard them as of specific value. The genital seta (cf. PI. 
XIII, figs. 1, 2) are distinctively different in the two species. 
The vas deferens in T. Gam mi i enters the body wall inde- 
pendently of the atrium ; in T. orientalis, as in other Earth- 
worms, the vas deferens joins the muscular portion of the 
atrium. 1 
1 I mention this supposed difference with some hesitation, not having the 
specimens of T. orientalis at hand to refer to. 
