26 
THE VOYAGE OF H.M.S. CHALLENGER. 
receives posteriorly the strong bile duct of the first group of papillae ; along its upper wall 
a strong fold runs from the cardiac to the pyloric end. The large main bile duct, which 
receives three or four smaller ducts on each side, runs through the hermaphrodite 
gland, in a groove on its lower surface; the duct, receiving 3-4 lateral bile ducts, 
enters the stomach close to its junction with the intestine. The course of the latter is 
downwards and then upwards to the anal papilla, the total length 6 mm.; its inner 
surface has numerous fine longitudinal folds, which decrease in number, but become 
stouter as the intestine passes backwards. The alimentary tract throughout its whole 
extent contained a quantity of animal matter, the nature of which I was not able to 
determine ; it was full of variously sized cnidse. The hepatic lobes are conical in form, but 
not quite equal in size ; the upper surface occasionally showed granulations. No trace of any 
cnidophorous sacs 1 could be detected, but a pore was sometimes visible upon the summit 
of the larger papillae. — The pericardium was quite typical ; the ventricle of the heart 
about 1’75 mm. long. The renal syrinx pyriform in shape, 1‘3 mm. long; the ureter 
about the same length as the latter ; I succeeded in tracing it as far as the renal pore. 
The hermaphrodite gland is long, the lobes large and irregular, composed of a number 
of smaller lobules ; the rounded testicular parts are covered nearly all over with the white 
or yellow ovarian follicles; the gonoblasts are developed. — The anterior genital mass is 
about 6 mm. long by 4 in breadth, and 4 '5 mm. in height. The ampulla of the 
hermaphrodite duct is elongated and sac-shaped, and curved in the middle; when 
straightened out it measures 4 mm. in length by about 1 mm. in diameter, and is of 
the usual opaque yellowish-grey colour. The ductus ejacidatorius (PI. X. fig. 2, aa) is 
strong and coiled ; when uncoiled it measures about 8 mm. long; it is somewhat thinner 
in the anterior third. The penis is much thicker, the prseputium (fig. 2 cc ) has rather 
thick walls. The glans is conical, about 2 mm. long, its anterior half freely projecting 
(PI. X. fig. 2, de; PI. XII. fig. 10). Into the ductus ejaculatorius opens another 
(PL X. fig. 2, b) somewhat thinner duct, which probably arises from some gland. The 
glans and the termination of the seminal duct are quite unarmed. The spermatheca 
(PI. X. fig. 3, a) is oval in form ; it was quite empty in the specimen which I examined ; 
the duct is nearly twice as long as the organ (fig. 3, be). The mucous gland is whitish, 
its cavity rather large ; the albuminiparous gland rather more yellowish. 
Between the bidbus pharyngeus and the anterior genital mass was found the female 
of an animal in form very like Splanchnotrophus ; 2 another was imbedded in the superior 
face of the hermaphrodite gland ; both individuals were about 5 to 6 mm. in length. 
No males were detected. 3 
1 In the doubtful species Cratena lugubris (Bergh, Malacolog. Untersuch., loc. cit., Heft i., 1876, pp. 9-12, Taf. iv. 
figs. 1-15) no cnidophorous sacs were found. 
2 The animals were too much hardened to allow of any thorough examination ; it was impossible to examine 
properly the anterior genital mass. 
3 In Homoiodoris japonica I found both male and female individuals resembling Splanchnotrophus. Cf. Bergh, Beitr. 
z. Kenntn. d. japan. Nudibr. II., Verhandl. d. k. k. zool.-bot. Gesellsch. Wien., Bd. xxxi., 1881, p. 226, Note. 
