410 Messrs. Alder and Hancock on a proposed New Order 
of the body ; the other (//) lies on the left side immediately be- 
hind the buccal mass, and extends backwards as far as the middle 
of the body. This organ is composed of large globular vesicles 
of a yellow colour, six of which make up the posterior, and four the 
anterior portion. The ova are generated in the interior of these 
vesicles, which are united by short ducts into pairs ; each pair 
having a single channel of communication with the central duct. 
Thus it would appear that the ovary as well as the testis has a 
dichotomous arrangement. The channels of the two portions of 
the ovary are united near the median line of the body, a little in 
front and to the left of the union of the two divisions of the 
testis ; and almost immediately after their junction, the comnfon 
oviduct, passing towards the right side, is suddenly enlarged and 
doubled once or twice upon itself (i) ; it is then as suddenly con- 
stricted, and shortly afterwards reaches the tube of the penis at y, 
just in advance of its union with the testis, as before stated. At 
this point the tube of the penis is attached to the upper surface 
of a large pellucid gland (^), which lies along the right side of 
the body, extending from the base of the penis to the orifice 
leading to the spermatheca. The colour and general appearance 
of this organ resembles that of the mucous gland of Eolis, and 
like it, no doubt, secretes the transparent jelly-like envelope that 
covers the eggs. This gland is of an irregular form, but neither 
its shape nor general structure could be determined with preci- 
sion, on account of the distortion produced by the compressor. 
The opake granular portion associated with this gland in Eolis 
would appear to be wanting, unless the two glandular-like organs 
(m), before noticed in connexion with the tube of the penis, are 
the homologues of this part, which we are rather inclined to think 
is the fact. 
The mucous gland terminates in front in a widish channel 
which opens externally (/) immediately behind the base of the 
penis. It is through this opening that the spawn, as before 
stated, issues from the body ; but we have not been able to ascer- 
tain how the eggs reach this channel : most probably the oviduct, 
shortly after its junction with the tube of the penis, sinks down 
into the channel of this gland ; and thus, as in Eolis, the passage 
for the eggs is accomplished. Whether this be the mode of com- 
munication or not, it is certain that the eggs find their way into 
the channel and anterior portion of the mucous gland, for we 
have had ocular proof of the fact. On one occasion, observing 
an individual spawning, we placed it in the compressor, and de- 
tected numerous ova, as described, in the anterior portion of the 
gland and also in the channel : a little more pressure forced them 
out at the orifice. 
The s|)erniatheca (ry) is an oval sac of considerable size and of 
