NOTES OX THE H ISTUIOEDEUH D.E. 
L>21 
'J'lie en'erent part of the female apparatus of Stratio- 
driliis differs considerably from that of Histriobdella as 
described by Foeitinger, whose account is endorsed by 
Shearer. It was incorrectly described in my former paper, 
since I mistook the returning limbs of tlie tliird pair of 
nephridia lor the oviducts. There are two female apertures 
situated ventro-laterally a little distance behind the third 
pair of cirri (fig. 14, $ ). Each leads into a short passage, 
which in some cases shows a rounded dilatation. Around the 
aperture, adherent to the integument, is an in-egular layer 
of amorphous clear-looking matter {Sh.), which may partly 
block the passage itself. 1 am inclined to agi-ee with 
Foettinger that this must be shell-forming material, and that 
it is produced by the specially developed epidermal layer 
around and within the aperture; it does not possess tlie 
resistent character of the eg-g-shell itself; but that would, as 
in other cases, only be acquired on contact with the ovum — 
probably as the result of some influence exei-ted by the outer 
layei* of the protoplasm. The passage or oviduct opens 
internally into a compartment of the body-cavity bounded 
behind by the septum separating the trunk-coelom from the 
tail-coelom, and in front by a second partition of coelenchyme 
bounding behind the cavity in which the ripe ovum is lodged. 
The aperture does not take the form of a funnel as in 
Histriobdella; but, just in front of it on its dorsal side 
is a prominent cushion-like body (cu.), the surface of which 
is beset with stiff cibhi vibi-ating sluggishly in the living 
animal. In the cushion and around the aperture are nume- 
rous nuclei and many muscular fibres. 
The partition separating the cavity in which the 
ripe ovum (with the rest of the ovary) lies from that out of 
which the oviducts lead, is thickened towards the middle, and 
produced into a pair of more or less prominent processes 
projecting backwards and outwards into the cavity behind. 
These thickenings, which vary greatly in different specimens, 
contain a number of nuclei, together sometimes with rounded 
bodies staining deeply with eosin. The proximity of these 
