206 FRANK E. BEDDARD. 
aperture on the boundary line between Segments xvi1/xVIII; 
it is curved, the concavity being forwards; the two ends of the 
orifice are wider than the middle part—like the mouth of an 
Actinozoon ; out of this orifice protrude the penial sete; the 
aperture is upon a conspicuous papilla, which is larger than 
that which bears the spermatothecal pore; there are two small 
supplementary papille at the posterior angles of the cushion. 
The external characters distinguish this species from the 
three others, viz. Eudriloides parvus, E. gypsatus, and 
EK. titanotus. 
In the first of these species there is a median papilla upon 
the 19th segment, but none is mentioned by Michaelsen upon 
the 11th. No papille are mentioned in the remaining two 
species; Eudriloides Cotterilli has not, as have the other 
species, a complete clitellum. 
Vascular System.—tThere is at present no information as 
to the vascular system of this genus. Michaelsen’s two papers,! 
which deal with the only species of Eudriloides known 
previously to the publication of this memoir, contain not a 
syllable about the blood-vessels. My own notes upon the sub- 
ject, though few, will therefore be of some use. The dorsal 
vessel has a thick coating of peritoneal cells, and its walls are 
of some thickness; in this it contrasts with the supra-intes- 
tinal vessel, which, although of greater calibre, has thin 
walls; the ventral vessel has also a covering of quite conspi- 
cuous cells. In the 10th and 11th segments there are a pair 
of perivisceral vessels which arise from the supra-intestinal 
vessel alone. I have ascertained that they have no connection 
at all with the dorsal vessel. These ‘“ hearts” have thick 
muscular walls, which commence abruptly at their origin from 
the supra-intestinal trunk; they are furnished along their 
course with frequent valves, and the opening into the ventral 
vessel is guarded with valves, as is also that into the supra- 
intestinal; in front of these are a series of perivisceral trunks 
of less calibre which arise from the dorsal vessel only, and 
have no connection with the supra-intestinal. The dorsal 
' Loe, cit. (on p. 201). 
