116 
THE VOYAGE OF H.M.S. CHALLENGER. 
•8 cm. ; the upper surface is covered by the reddish-grey peritoneum ; the colour of the 
gland is yellowish-white, the surface granular ; the larger granules are spermatic, the 
finer ones on their surface ovarian (fig. 12) ; the spermatozoa are of the ordinary form, 
the head measuring from •009- , 013 (fig. 13) mm., the minute ducts of the lobules are 
visible between the granules. From the inferior surface of the gland the strong 
hermaphrodite duct takes its origin (fig. 11). — The anterior genital mass is large, and 
measures 6 cm. in length by 5 cm. in height, and 3 '5 cm. in thickness ; the efferent ducts 
(2 or 3 cm.) prominent. The right side is very convex, thicker in front than 
behind ; the inner (left) side flattened through contact with the bulbus pharyngeus, 
and somewhat hollowed out ; the upper surface straight and rather flat ; the under surface 
rather convex, but broader and flatter in front ; the hinder end being more sloping and 
rounded. The hermaphrodite duct is about 4'5 cm. long, and, passing over to the hinder 
part of the anterior genital mass, forms a coil on the upper part of its right side about 
4 cm. long ; the diameter of the duct is about 3 mm., it continues its course to a 
short distance from the root of the large duct of the mucous gland, where it divides in the 
usual way. The vas deferens , issuing from the hermaphrodite duct, pursues a winding 
course to the prseputium, where it forms a dense coil (PI. XIV. fig. 14, a ) ; when unrolled 
the duct measures about 7 cm. long by about 1*6 mm. in diameter. The prceputium 
has a length of some 3 '5 cm. with a uniform diameter of 2 - 2 cm., the thickness of its 
walls is about 1'5 to ■ 5 mm.; the cavity is almost filled by the large glans 
(PL XII. fig. 14, c), which has a length of 3 - 7 cm. and a breadth at its base of 1’9 cm.; 
in form it is conical, somewhat flattened on the under surface, where there is a long, wide, 
oblique cleft (PI. XIV. figs. 14, 15), continued backwards into a wide cavity without any 
hole at the bottom ; the continuation of the vas deferens, much coiled, could be followed 
along the whole of the upper side of the glans (fig. 15) into a small round opening at its 
point (figs. 14, c, 15, c); there was no trace of any armature of the glans or vas deferens. 
The glans is muscular, and contains large longitudinal vessels or lacunae, especially 
developed towards the point, and a thick nerve. The cuticle on the cleft of the gland was 
colourless and quite smooth. The spermatheca, as far as could be made out, is 
roundish and flattened in form, of about 18 mm. diameter; it was quite empty and 
nearly concealed by the windings of the ampulla ; its vaginal duct is no thicker than 
the vas deferens, and of about the same length as the organ itself. The spermatocyst 
lies beneath the windings of the hermaphrodite duct, and is whitish in colour, flattened, 
and of a rounded contour, 1 3 mm. in diameter ; it was full of spermatozoa. The 
mucous gland is whitish in colour, with a tinge of green at its hinder part ; the 
albuminiparous gland of a pale yellow ; the duct of the mucous gland is about 3 ’5 cm. 
long and 1‘7 cm. in diameter, the upper portion has (fig. 14) on its inner surface a 
number of longitudinal folds; the very strong, deeply furrowed fold (PI. XII. fig. 14, c) 
is chalk-white. 
