312 Rev. M. J. Berkeley's Anatomy of 



Future observations must show whether amongst the different species 

 of Helicolimaces (Vitrinae) there are forms requiring separation ; at 

 present there seems no sufficient reason to doubt their general agreement. 



I would remark that I have used the word Helicolimax throughout 

 merely to keep up an uniformity with Mr. Lowe's paper, and to avoid the 

 possibility of confusion. Vitrina appears by far the most preferable 

 name, as it asserts nothing more than the glass-like appearance of the 

 shells, whereas Helicolimax would lead us to suppose the shells exactly 

 intermediate between the two genera of which the name is compounded, 

 which is scarcely strictly true. 



References to the Figures. 



N. B, All are more or less magnified. 



Tab. Supp. XLVIII. 



Fig. 1. Represents the mass of the mouth and intestines, the nervous 

 cord having been removed from its situation, above the 

 origin of the oesophagus. The stomach is in its state of 

 contraction. 



m. Mass of mouth. 



n. n. Salivary ducts. 



0. (Esophagus. 



p. Cartilagineous cone of the tongue. 



q. Retractor muscle of mass of the mouth. 



r. Salivary glands, covering upper portion of the stomach. 



s. Lower portion. 



t. Rectum. 



u. Anus. 

 Fig. 2. Part of the oesophagus, stomach and duodenum, from which 

 the salivary glands have been removed ; the upper por- 

 tion of the stomach is in its extreme state of contraction. 



o. (Esophagus, 



V. Upper portion of stomach. 



s. Lower portion. 



