244 PROCEEDINGS OF THE ACADEMY OF 



Helix Ayresiana, Newcomb. {Ariontu.) 



San Miguel Island, California. Mr. Henry Harford. 



Animal long and slender, smok3'-white, covered witli 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 

 witli six ribs. 



Helix ruficincta, Newcomb. {Arionta.) 



Catalina Island, California. Mr. Henry Hemphill. 



Jaw more like the t}' pe common in Mesodon than in Arionta^ i. e., 

 arcuate rather than arched, margins rather pectinated than scal- 

 lofied b}"^ 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., 

 %. 13, 3. 

 San Diego, California. Mi*. Heniy Hemphill. 



This species belongs to no described section or subgenus, we 

 propose for it, therefore, the name Glijpfostoma, {yXvTttoi, atioixa). 

 from the peculiar sculptured lines which revolve upon the parietal 

 wall. 



Glyptostoma, snbgcn. nov. 



Testa hite umbilicata, depressa, ruguloso-striata, solida, aufractus G, 

 ultimus dcprcsso-globosus, autice nou dcsceudens ; apertura obliqua, sub- 

 circnlaris ; peristoma simplex, acutum, intus incrassatum, marginibus 

 approxiinatis, columellari brcvi, vix reflexiusculo. 



]\Iaxilla arcuata, costis validis distantibus (circa IG) cxarata ; margines 

 valde dentati.2 ^ 



Lamina lingualis ut in Helice videtnr ; dentes marginales subquadrati. 



' See note 2 to p. 343. 



' See our plate I., flg. 1, and the explanation of the plate. 



