244 PROCEEDINGS OF THE ACADEMY OP 



Helix Ayresiana, Newcomb. (Arionta.) 



San Miguel Island, California. Mr. Henry Harford. 



Animal long and slender, smoky-white, covered with white 

 coarse granulations running longitudinally down the back, one 

 line of granulations very prominent and central, bordered on 

 either side with a deep furrow. Also oblique lines of granulations 

 running down the sides of the foot. Foot dirty-white below. Tail 

 short, broad, pointed. Some individuals are darker, with a purplish 

 tinge. 



Jaw and lingual membrane as usual in the subgenus,^ the former 

 with six ribs. 



Helix ruficincta, Newcomb. {Arionta.) 



Catalina Island, California. Mr. Henry Hemphill. 



Jaw more like the type common in Mesodon than in Arionta^ i. e., 

 arcuate rather than arched, margins rather pectinated than scal- 

 loped by the ends of the ribs, which are about ten in number. 



Lingual membrane as usual in the subgenus.^ 



Helix Kelletti, Forbes. (, Arionta.) 



Catalina Island, California. Mr. Henry Hemphill. 



Jaw and lingual membrane as usual in the subgenus,^ the former 

 with about six ribs. 



Helix Newberryana, W. G. Binney. {Glyptostoma.) See our plate I., 

 fio-. 12, 3. 

 San Diego, California. Mr. Henry Hemphill. 



This species belongs to no described section or subgenus, we 

 propose for it, therefore, the name Gli/ptostoma, {yXvTttoi, tffw^a), 

 from the peculiar sculptured lines which revolve upon the parietal 

 wall. 



Glyptostoma, ffiibgen. nov. 



Testa late umbilicata, depressa, ruguloso-striata, solida, anfractus 6, 

 ultimus depresso-globosus, antice non descendens ; apertura obliqiia, sub- 

 circularis ; peristoma simplex, acutum, intus incrassatum, marginibus 

 approximatis, columellari brevi, vix rcflexiusciilo. 



Maxilla arcuata, costis validis distantibus (circa 16) exarata ; margines 

 valde dentati.2 



Lamina lingualis ut in Helice videtur ; dentes marginales subquadrati. 



• See note 2 to p. 243. 



2 See our plate I., fig. 1, and the explanation of the plate. 



