110 
FRANK E. BEDDARD. 
themselves are so exactly like those of Acanthodril us that 
no further description is necessary. 
The ovaries are situated on the anterior wall of segment 
13; they are digitate bodies like the ovaries of Acantho- 
dril us. 
The oviducts open by funnels which are placed near to 
each other aud on either side of the nerve-cord, on the pos- 
terior wall of segment 13. The external pores, as already 
stated, are upon the 14th segment. 
The spermathecas have a very characteristic form, which 
is illustrated in PI. XIII, fig. 5. The spermatheca is a somewhat 
oval pouch, which suddenly narrows into a slender duct, opening 
close to the anterior margin of the segment. At the junction 
of the pouch with the duct are three diverticula, two on one 
side and one on the other; the diverticula are very much 
smaller than the pouch, and of a regular oval form. 
The following table indicates the principal points in which 
Deinodrilus agrees with Acanthodrilus orPerichseta: 
Acanthodrilus. 
Deinodrilus. 
Perichaeta. 
Clitellum . 
Segments 12 — 19, or 
thereabouts ; unde- 
veloped between the 
atrial pores and the 
corresponding area 
on the other seg- 
ments. 
Segments 14 — 16 
(inclusive) ; con- 
tinuous all round 
the body. 
Usually segments 14 
— 16 (inclusive) ; 
continuous all 
round the body. 
Setae . . 
8 per segment. 
12 per segment. 
20 — 100 per segment. 
Atria . . 
Two pairs of convo- 
luted tubes opening 
on to segments 17 
and 19. 
Two pairs of con- 
voluted tubes 
opening on to 
segments 17 and 
19. 
Usually represented 
by a single pair of 
branched glands 
opening on to eigh- 
teenth segment. 1 
1 In Bourne’s P. Stuarti (9) the atria appear to be like those of Acau- 
thodrilus. 
