REPORT ON THE NUDIBRAN CHIATA. 
125 
The pericardium and the pericardial gill as usual. The yellow coloured chamber of 
the heart is 275 mm. long. The blood gland is greenish-grey coloured, about 7 mm. long 
by 4 mm. in breadth and '2 mm. in thickness.— -The renal syrinx is brownish-grey, melon- 
shaped of 3 ‘5 mm diameter with strong internal folds. The urinary chamber as usual. 
The retractor longus branchial and the retractor papilke analis 1 as usual. 
The hermaphrodite gland, by its yellow colour, contrasting markedly with the grey liver, 
clothes the anterior end and the anterior half of the upper side of this organ with discrete 
or coalescent lobes; its structure is as usual; the gonoblasts being well developed. — The 
biconvex anterior genital mass about 6 mm. long by 10 mm. broad and 8 mm. in 
height; the efferent duct projects, moreover, 1*5 mm. The ampulla of the herma- 
phrodite duct (PL Y. fig. 28, a) rests on the upper margin of the genital mass, and is 
yellow and pear-shaped, 5 '5 mm. long (fig. 28, 6). The male branch, which arises from 
the ampulla, runs on the upper margin of the brownish -yellow albuminiparous gland (fig. 
28, dd), and is continued in the whitish-yellowish coloured prostate which descends on the 
anterior end of the genital mass; its total length is 13 mm. and its diameter 1 mm., 
it is cylindrical or slightly flattened, the upper surface not quite even, the walls thick, 
the axial cavity therefore rather narrow. From the lower end of the prostate the thin 
seminal duct takes its course to the genital papilla (fig. 28, e), in the last portion (75 mm.) 
it is a trifle wider, and forms the penis (prseputium) (fig. 28,/) ; the whole length of the 
seminal duct is 8 mm. At the base of the cavity of the yellow prseputium is the trun- 
cated cylindrical glans, which is about ‘25 mm. in length by ‘08 mm. in breadth and 
‘03 mm. at its point. The glans (PI. IY. figs. 5, 6) has 8-12-15 quincuncially arranged 
longitudinal rows of fine yellowish hooks, '013 mm. high (PI. Y. figs. 30, 31) ; this part 
of the glans, where the hooks are developed, is not continued backward into the seminal 
duct proper (PI. IY. fig. 5, a). The spermatheca is spherical, about 3 '5 mm. in diameter 
(fig. 28, g), whitish in colour ; its short duct bifurcates. The vaginal duct (fig. 28, h) is thin 
and quite as long as the vas deferens, behind it becomes a little wider and forms the 
vagina (fig. 28, i), whose length is about 75 mm.; for about ’37 mm. of its length the 
vagina is lined by a fine brownish cuticle; this portion is about '013 mm. in diameter, 
widening like a funnel behind and before (fig. 29, aa). 2 The uterine duct (fig. 28, k) is 
rather shorter, coiled, resting on the albuminiparous gland, and opens close to the female 
branch of the ampulla (fig. 28, c ) ; just in front of its opening it receives the short duct of 
the spherical spermatocyst (fig. 28, l) ; this organ is whitish in colour and has a diameter 
of 2 mm.; it was filled with semen. The mucous gland is large, white and yellowish- 
white in colour ; the albuminiparous gland is free at the upper margin and on the hinder 
1 Loc. cit., 1880, p. 307. 
2 I have observed a similar condition in Doriopsis tristis (op. cit. III. Journ. d. Mus. Godeffroy, Heft viii., 1875. 
Taf. xi. fig. 5 ; — IV. Heft xiv., 1878, Taf. ii. fig. 17), and also in Doriopsis debilis (Malacolog. Untersuch., loc cit. 
Supplementheft i., 1880, p. 11, Taf. D. fig. 29). 
