78 
THE VOYAGE OE H.M.S. CHALLENGER. 
margins, white in colour, broader ('75 mm.) in front than behind, and about 1 cm. long ; 
the hinder ends of the glands beneath the bulbus are twisted round each other. 
The oesophagus is thin, about 7 mm. long, entering in the middle of the larger 
facet of the posterior visceral mass, a little to the right. The cavity of the liver, as in the 
last species, performs the function of a stomach; it is small in extent. The intestine 
breaks through the middle of the liver, a little to the left ; its loop lies anteriorly upon 
the anterior genital mass ; posteriorly it runs in a deep groove on the right hand surface 
of the liver ; in the middle of the anteriorly- directed portion of the intestine its width 
is greater (1'5 mm.), elsewhere it is only half as broad; its length when uncoiled was 
1'5 cm. The digestive tract was empty. 
The liver is 8 mm. long by 6 in breadth and 5 '5 mm. in height; the anterior two- 
thirds of the right side hollowed out into a facet for the anterior genital mass ; the 
hinder end is short and cylindrical ; its proper brownish-grey colour is merely visible 
on the lower and right hand surface ; elsewhere it is covered by the dirty yellow herma- 
phrodite gland. The small pear-shaped gall-bladder lies to the left, on the upper sur- 
face of the liver, close to the origin of the gut. 
The faintly green pericardium and the heart were as usual. The green blood gland is 
2 mm. in length, 1 mm. in breadth, and lies in front of and upon the anterior genital 
mass. — The whitish-yellow renal syrinx is small. 
The hermaphrodite gland is thick, and yellowish in colour ; it presents the usual 
structure ; the lobules contain larger oogenous cells and spermatozoa. — The anterior 
genital mass is 5 '5 mm. long by 3 '5 mm. in height and 3 mm. in breadth; the efferent 
ducts are bluish-green, and project about 2 '5 mm. The yellowish-white ampulla has a 
very slightly undulatory course ; its length when straightened out is about 4 mm. 
The spermatheca (fig. 4, a) is spherical, 2 '5 mm. in diameter, yellowish-white, it was 
full of semen ; the vaginal efferent duct (fig. 4, b), together with the wider greenish-blue 
vagina (fig. 4, c), about one-half longer than the receptaculum ; the uterine duct (fig. 4, d) 
is much longer and thinner. The pear-shaped spermatocyst (fig. 4, e) is very small, and 
sessile on the origin of the vaginal duct. 1 The vas deferens is long (about three times 
as long as the penis) and thin, whitish in colour, and passes into the conical greenish- 
blue coloured penis, which is about 4 mm. long by 2 mm. in width. At the base of 
the cavity of the prseputium is a small perforated papilla, the glans. The mucous gland 
is white, the albuminiparous gland olive-brownish yellow ; the duct greenish-blue outside 
as well as inside. 
1 The spermatocyst is quite as small in Cliromodoris semperi. Loc. cit., Taf. lv. figs. 6b, 76. 
