170 PKOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



posterior margin of the diaphragm (p.m.d.) a little to the right of the 

 middle ; it unites with the shell in the little pit excavated therein, 

 and in part with the columella. The right tentacle retractor (r.t.r.) 

 unites with the diaphragm, a little anterior to, and about one millimetre 

 to the right of, the buccal mass retractor. The left tentacle retractor 

 (l.t.r.) is inserted in the left margin of the diaphragm, slightly anterior, 

 and about three millimetres to the left of, the insertion of the buccal 

 mass retractor ; it corresponds in position with the narrow muscle-scar 

 on the shell. The pedal muscles have degenerated, and much resemble 

 those of the true slugs. I failed to discover any indication of a true 

 columellar muscle ; the strongly developed retractor of the buccal 

 mass serves that purpose, and in its peculiar attachment with the 

 shell doubtless receives the maximum of resistance. 



The position of the organs viewed from above is as follows : — 

 Buccal mass large, the posterior half concealed by the salivary glands ; 

 the latter lie side by side, and are united by a few delicate threads. 

 The genital system is on the right side, the large albumen gland above 

 the retractor of the buccal mass, and immediately posterior to the 

 salivary glands ; the hermaphrodite duct proceeds to the left, its gland 

 being imbedded in the liver. Removing the salivary and albumen 

 glands, the small stomach is seen passing gradually towards the left 

 side of the buccal mass, its posterior end enveloped by the liver and 

 receiving the right and left hepatic ducts. The intestine passes 

 through the folds of the liver ; it is very short, little more than 

 equalling the stomach in length, passes back to almost the posterior 

 limit of the visceral cavity (the latter extends considerably behind the 

 posterior margin of the diaphragm, as indicated by the dotted lines 

 in Fig. 10), thence makes a small complete turn to the right, curving 

 under the posterior end of the buccal mass retractor, then upward 

 and to the right over the muscle, terminating in a short rectum. The 

 lobes of the liver are about equal in size. The left tentacle retractor 

 proceeds on the outer left side of all the organs ; it has a slightly 

 curved line of resistance, but much less so than if it were applied close 

 to the pharangeal retractor ; the latter and right retractor proceed side 

 by side, the line of resistance being direct. The pedal gland (pd g.) 

 extends back to the position indicated in Fig. 10, where it ends in 

 a slight enlargement, attached and lightly impressed in the substance 

 of the foot. A small cavity proceeds from the posterior end of the 

 visceral cavity, to almost the end of the tail, shorter, but otherwise 

 similar to, those of Rhytida and of Paryphanta Hochstclteri, Pfr. In 

 these animals, the large muscles proceeding from the foot to the 

 columella are pierced by a small tunnel, which receives the posterior 

 end of the pedal gland. The absence of these muscles and a slight 

 excavation of the substance of the tail have provided for the reception 

 of a considerable portion of the viscera, and thus separate the pedal 

 gland from the cavity in the tail, the foimer remaining unchanged. 



The nerve ganglia and their accompanying connectives are situated 

 similarly to those of the preceding species. 



I have examined the genitalia of several specimens, but failed to 

 discover any trace of the spevmatheea. 



