220 MESSRS. HANCOCK AND EMBLETON ON THE ANATOMY OF DORIS. 
largely developed. These two, at first sight dissimilar parts, we look upon as portions 
of the same gland, the testis. The looser part of the tube is much larger in calibre 
than that which .is compacted in the fusiform mass, the latter tube being almost 
microscopic ; the former is external, and at one end is in connexion with the penis 
by means of a much-attenuated and long duct, analogous to that which in D. repanda 
we have named vas deferens ; at the other end it merges into the tube forming the 
spindle-shaped mass ; the internal end of this latter tube opens into the oviduct, at 
the usual part at which the testis is received in the former category of species. The 
dilated part of the oviduct in this species is of unusual length, and the spermatheca 
of large size, as if in correspondence with the great elaboration of the testis. A small 
glandular sac, moreover, provided with a small duct, opens a little within the ex- 
ternal orifice of the vagina, and this tube, which is short, communicates directly and 
separately with the spermatheca. The duct from that reservoir is short and delicate, 
comes off close to the junction of the vaginal tube, and shortly before it is united to 
the oviduct receives the duct of the accessory spermatheca. 
In D. cocclnea^' the testis is represented by the fusiform mass alone, which com- 
municates by a very short simple duct with the penis at one end, and at the other, as 
usual, with the oviduct, which, as in some previously described examples, is here 
much constricted. The androgynous apparatus is arranged as in the last species, 
except that the vaginal gland is absent. 
D. verrucosa has all the organs as last described, except the androgynous parts, 
which are in their connexions with each other slightly modified. 
D. tloJinstoni^ has the fusiform gland composed of a very fine tube densely packed 
and connected at both ends, precisely as in D. tuherculnta, Verany, and D. coccinea, 
and the other organs are likewise disposed on the same plan as in those species. 
In this species, however, and in D. tomentosa, Verany, a closely allied species, we 
have the following addition to the already complicated male organs. There is an 
elongated hollow pouch, longer than the penis, placed in front of that organ, and 
opening alongside of it into the common vestibule. This pouch, into which projects, 
when the parts are quite retracted into the body, the finely-pointed end of a dart or 
stiletto, which in D. Jolinstoni is straight, in D. tomentosa curved, is capable of being 
everted like the tentacle of a snail. To one side, and near the apex or internal end 
of this pouch, is attached by a short pedicle, a small ovate sac:{:, from the side of 
which again a small twisted tube leads to a large, long, irregular, curved membranous 
bag, lying on the outer side of the mucus-gland. The stiletto mentioned above 
has its thicker end lodged in, and growing from the inner extremity of the ovate 
sac, whilst its shaft projects along the narrow pedicle of the sac into the hollow 
pouch beyond. This stiletto is evidently the production of the lining membrane of 
the ovate sac ; that membrane forms also a sheath for a considerable portion of the 
stiletto, and projects with it into the pouch ; here however we find it succeeded by a 
* Plate XV. fig. 3. f Plate XIV. figs. 9 and 10. J Plate XV. fig. 1. 
