GUDE : ON THE AEMATURE OF LAND MOLLUSCA. 



7i 



posterior terminations they are united by a slight, vertical ridge, 

 which projects a little beyond the upper fold. The palatal wall 

 bears three short, parallel, horizontal folds at one-third of the whorl 

 from the aperture. 



Fig. 6. — Slrobilopii quadrasi. 



Strobilojys trochospira, MlldfE., which occurs in the island of Cebu, 

 is a trifle larger than the last-named species, measuring 4 mm. in 

 diameter ; on the parietal wall are found two long, parallel, 

 horizontal folds revolving over nearly half a whorl, the upper one 

 being the stronger and united to the parietal ridge at the aperture, 

 while the lower one is thinner and terminates at a short distance 

 from the parietal ridge ; a very thin, short, horizontal fold occurs 



Fig. l.—Strobilops trochospira. 



posteriorly between these two (see Fig. 7e). There are five short, 

 thin, horizontal, palatal lamellae, descending a little anteriorly 

 (see Fig. Id). 



Genus Pupilla, Turton {sensu lato). 



This is widely distributed, occurring in Europe, Asia, Africa, 

 and America. It possesses numerous minute species, which are 

 provided with teeth or folds in the aperture. P. muscorum, Lin., 

 of circumpolar distribution and a well-known shell in these islands, 

 only possesses a small denticle on the parietal callus. P. brevicostis, 

 Bens., an Indian species, is provided with five or six plicae : one 

 short angular, one oblique, entering parietal, one columellar, and two 

 or three palatal, rather deep-seated. 



P. pentodon, Say, from North America, has from six to nine 

 denticles or folds, those on the peristome being situate on a ridge 

 of white callus ; there may be one or two on the parietal wall, one 



