REPORT ON THE NUDIBRANCHIATA. 
97 
The 'posterior visceral mass (liver) (fig. 22, dd) was large, about 2 - 6 cm. long by 2T 
cm. broad and 1 '4 cm. high ; the posterior end was rounded ; the anterior truncated end 
broad, above (fig. 22) with a broad fissure (longer above) for the stomach, and below with a 
broad facet for the anterior genital mass ; on the upper side was the narrow mesial furrow 
for the urinary chamber, not very deep and running rather obliquely ; to the right the 
broader furrow for the intestine. The liver appeared uncovered here and there on the 
lower half of the anterior end and on the lower side, in the form of pale dirty yellow 
streaks ; everywhere else it was covered by the ochre-yellow hermaphrodite gland. The 
hepatic cavity was pretty wide, with wide crypts. The gall-bladder lay at the posterior 
end of the stomach, showing a small roundish facet on the surface of the liver (fig. 22), 
about 5‘5 mm. high, and opening right in the front into the hepatic cavity. 
The pericardium was large ; the ventricle of the heart 6 mm. long. The blood glands 
were loam-grey, very much flattened, and completely separated from one another by the 
ganglion-mass. The anterior gland 4 mm. in greatest diameter with a thickness of '6 
mm., was angularly round with truncated posterior end ; the posterior 4 mm. long, 
tongue-shapecl, the point turning backwards. — The musculi retractores branchice laterales 
about 12 mm. long, having several heads ; between these, running parallel to them, were 
the four weaker musculi retractores branchice medii, which pass on to the anal papilla and 
to the posterior leaves of the gill. — The renal syrinx was about 3 '5 mm. long, pyriform; the 
duct strong and thick- walled. The urinary chamber narrow ; the kidney strongly developed. 
The ochre-yellow hermaphrodite gland covered the greater part of the liver (vide 
supra) ; there were large oogene cells and zoosperma in the lobes. The duct of the 
hermaphrodite gland rose above the cardia, and ran upwards obliquely to the posterior 
side of the anterior genital mass. The latter was large, nearly 8 mm. long (from before 
backwards) by 6 ’5 mm. broad and 14 mm. high; the efferent ducts, moreover, projected 
nearly 3 mm. It was high, slightly compressed from the front backwards, with an 
external, anterior and posterior face ; the prostate lies on the flattened lower side ; the 
duct of the hermaphrodite gland runs down on the posterior side and forms the ampulla 
on the lower margin ; the brown-yellow albumen-gland lies exposed in the middle behind 
the hermaphrodite duct ; the spermatic duct, ascending to the penis, projects on the 
anterior side. The opaque yellow-white ampulla of the hermaphrodite duct (PI. III. 
fig. 13, a), forms a series of flexions on the lower margin of the genital mass inside from 
the prostate ; in the specimen examined it measured when extended 1‘5 cm. long and 
- 7 mm. broad. The short male branch (PI. III. fig. 13, c) passing into the yellowish-grey 
somewhat compressed prostate (fig. 13, cd) ; the first part of the latter was nearly 14 mm. 
long by 5 mm. in greatest diameter ; the lower terminal end was nearly 6 mm. long, 
narrowed (like the upper), yellower, bent and attached to the preceding part. The cavity 
extending through the whole organ was narrow. The prostate became gradually smaller 
and passed into the spermatic duct (fig. 13, e), which was about 8 '5 mm. long, tolerably 
(ZOOL. CHALL. EXP. — PART XXVI. 1884 ) Cc 13 
