96 Cincinnati Society of Natural History. 



forward to open on the right side, and a little below the respiratory 

 orifice. The liver is large, lobed, placed posteriorly, and opens by 

 ducts both into the pyloric portion of the stomach and into the intes- 

 tine. There is a well developed pancreas. 



The Nervous System (fig. 2). 



The nervous system consists of the usual collar, forming dense, yel- 

 low, irregular, and much-branched ganglia, nearly surrounding the 



Fig 2. 

 A, supra-cesophageal ganglion ; I, infra-oesophageal ganglion; 0', optic branches; SS', 

 gtomato-gastric branches and ganglia ; P, pedal branches; D, dorsal branches to pulmonary 

 cavity, etc. 



OPsophagus, just posteriorly to the buccal mass. The supra-oesophageal 

 ganglion is much larger than the infra, and sends filaments to each 

 side of the buccal mass, to the base of the tentacles, to the penis and 

 vagina, and to the floor of the pulmouaiy cavity. The stomato-gastric 

 ganglion, which lies on each side, at the junction of the oesophagus, 

 the duct of the salivary gland, and the buccal mass, receives a filament^ 

 and distributes branches to the buccal mass, to the ducts of the salivary 

 gland, and to the oesophagus, the distribution being much as I have 

 found it in Arioliinax. The main branches of the infra are distributed 

 to the foot. 



The Reproductive System (fig. 3). 



This consists of a very complex hermaphrodite apparatus, opening 

 on the right side by two apertures. The ovary is a flocculent, light 

 yellow mass, folded between the liver and the stomach ; the testicle 

 lies close to it, and anteriorly in the natural position of the organs. 

 The oviduct is comparatively wide and short, and terminates in a 

 distinct vagina, opening exteriorly. The prostate is well defined, and 



