160 Transactions.— Zoology. 
On each side of the esophagus there is a large salivary gland (fig. 5 c), 
the ducts opening into the posterior portion of the buccal mass. Below the 
buccal mass and cwesophagus lies a peculiar tongue-shaped organ (fig. 4 d), 
which is ductless, and fastened in its anterior half to the body wall, but free 
posteriorly. It is composed of rounded nucleated cells, -and is grooved 
along its upper surface. It may represent the organ of Semper in other slugs. 
The stomach is long, and makes nearly three right-hand spiral turns. 
It passes gradually into the intestine, which turns forward, and follows the 
stomach back through its windings to the cesophagus; it then turns sud- 
denly back, round the posterior branch of the aorta (fig. 5 f), and again 
descends nearly to the end of the stomach ; it then turns suddenly forward, 
and once more following the convolutions of the stomach, ends in a short 
straight rectum, which opens on the right side below and in front of the 
respiratory opening. The liver (fig. 5 ¢) is formed of two compact spindle- 
shaped lobes. In J. marmorea the intestine turns forward immediately after 
receiving the hepatic ducts, but in J. bitentaculata it descends nearly to the 
posterior end of the liver, making another half turn before it turns forward. 
Reproductive system (fig. 7). The evotestis is subrotund in form and 
divided longitudinally below by a groove running from the hermaphrodite 
duct, which is purplish. It is of a dead white or pale yellow colour. Itis 
remarkable for its position in the animal, lying in front of the rectum, while 
in all other slugs with which I am acquainted it is placed posteriorly, among 
the folds of the liver. The albumen gland is long and tongue-shaped, and 
of a pale yellow. In J. marmorea there are two other large accessory glands 
at its base, but these are absent in J. bitentaculata. It is, however, quite 
possible that these so-called accessory glands may be folds of the oviduct 
which I was unable to unravel. The vas deferens separates from the oviduct 
at its commencement in J. marmorea, and at about the middle in J. biten- 
taculata. If the supposed accessory glands in J. marmorea are but folds of 
the oviduct, then the vas deferens would separate in the same position in 
both species. The penis is long, narrow, and tapering, and the vas deferens 
enters it at its posterior extremity. The retractor of the penis (fig. 7 4) 
arises from the musculature of the foot, on the left side, in a line with the 
respiratory opening ; it is inserted into the posterior extremity of the penis. 
The spermatheca (fig. 7 g) is purplish brown, globular, with a short neck ; 
it is situated on the oviduct, a short distance from the genital opening. The 
penis lies across the animal’s neck, over the nerve collar. The spermatozoa 
are gradually thickened at one end, which is spirally twisted. In J. mar 
morea the ovo-testis lies on the upper surface, and is exposed when the 
animal is opened from the back; in J. bitentaculata it is hidden, but can be 
seen from below. 
