194 MR. A. HANCOCK ON THE ANATOMY OF DORIDOPSIS. 
length, and contains, apparently, a minute convoluted tube. This inner dilated portion 
has its inner extremity connected with the oviduct (7) just before the latter sinks into 
the mucous gland of the female parts. The whole of this glandular tube is closely con. 
voluted, and lies in front of the other organs, and was described in the paper before 
referred to, on the anatomy of Doris, as the testis; but I am now satisfied, for reasons 
afterwards given, that this was a misnomer, and that it must be looked upon as a vas 
deferens. 
The ovary (Pl. XVII. fig. 15), which is of a full rose-colour, is spread over the anterior 
surface of the liver, and is comparatively of limited extent. It is composed of a few 
well-marked lobes, which are made up of numerous minute lobules. Two main branches 
of the oviduct are seen to converge as they leave the upper and anterior surface of the 
ovary, and almost immediately to unite, forming a delicate tube (£), which, passing to 
the right, abruptly dilates (v). This dilated portion (Pl. XVIII. fig. 2 i) is of considerable 
length, and is convoluted into an irregular mass, which is of a reddish flesh-colour. The 
oviduct again suddenly contracts into a slender tube (7), and, almost immediately doubling 
upon itself, communicates with the inner extremity of the vas deferens, and then sinks 
(k) into the anterior portion of the great mucous gland, where, no doubt, after uniting 
with the tube of the androgynous apparatus, it opens into the female channel. 
Originally we looked upon the ovary in the Nudibranchs as a gland merely for the 
purpose of secreting the ova; but further experience has proved that those naturalists 
are correct who have asserted that the ovary in these animals is a compound organ for 
the development not only of ova, but likewise of spermatozoa*. I have detected in 
several Nudibranchs separate sacculi or portions of the organ for the development of the 
ova and the spermatozoa respectively, but have not succeeded in determining these parts 
with sufficient precision in Doridopsis. It will therefore be necessary to the right com- 
prehension of these parts, in this genus, to examine them in detail in some of the other 
forms just alluded to. 
First, then, with regard to Goniodoris nodosa, the so-called ovary (Pl. XIX. fig. 1), Is 
composed of a wide ramified tube spread over the liver. The ramifications show little 
disposition to symmetry, except that there is a tendency to a pinnate arrangement of the 
secondary branches, the whole forming a system that terminates in the oviduct i 
which is much constricted as it leaves the organ. Allthe ramifications (d) are ee y 
beset, on the under surface and extremities, with sacculi or diverticula (e), the Nor 
sacs, which are of a darker colour than the tubes, and are filled with ova. The — 
tubes themselves contain spermatozoa in parallel order, and apparently in an d 
state. Here, then, these tubes seem to be the male secreting organ, while the sac 
produce the ova. ad 
The so-called ovary in Doris tuberculata is composed of a minute ramified S 
(fig. 4d), with the under surface, margins, and ends beset with comparatively "9 
rounded saceuli (e) of a full yellow colour. These secrete the ova; the tubes the spe" 
matozoa. 
^ : : nd i5 
In Triopa claviger, the organ is spread over the upper surface of the liver, 7 
* See * Anatomy of the Invertebrata,’ by Siebold, translated by Burnett, p. 237. 
