NESOPUP^ OP THE MASCARENE ISLANDS. 355 



margin; peristome simple, slightly expanded, the margins 

 joined by a callus, right margin somewhat sinuous, columel- 

 lar margin dilated above. Length 2.5, diam. 1.75 mm. 

 (H. Ad.}. 



Mauritius: The Moka ravines (G. Nevill). 



Pupa (Pagodella) ventricosa H. ADAMS, Proc. Zool. Soc. 

 London, 1867, p. 304, pi. 19, f. 6. Pfr., Monogr., vi, p. 308. 

 Pagodella ventricosa H. Ad., G. NEVILL, Journ. Asiatic 

 Soc. Bengal, vol. 39, pt. 2, 1870, p. 413. 



G. Nevill writes of Pagodella ventricosa: "I found about 

 40 specimens, to all appearance full grown and in first-rate 

 condition, some of them, to my mind, very old specimens; in 

 none of them were there any signs of any teeth whatever 

 within the outer margin of the aperture." 



53. " VERTIGO " ( ? ) PRASLINENSIS ( G. Nevill ) . Not figured. 



Shell resembles Pupa lienardiana Crosse, from Rodriguez, 

 but the spire is less produced and there is no trace of the 

 conspicuous parietal tooth; apex remarkably obtuse; 4% 

 whorls which increase very rapidly, the first three more or 

 less cylindrical, the last one moderately convex ; smooth, even 

 under the lens no trace of sculpture is discernible; aperture 

 triangular, regularly rounded at base, external margin some- 

 what obsoletely sinuate; a strongly developed, transverse 

 columellar tooth, three other palatal teeth, equidistant, the 

 middle one the largest, no parietal tooth (G. Nevill). 



Length 2 mm. 



Seychelles Group: Praslin, near the Protestant church, at 

 the foot of a cocoanut tree (Nevill; type in Indian Mus.). 



Carychium n. sp., G. NEVILL, Proc. Zool. Soc. Lond., 1869, 

 p. 65. Vertigo praslinensis G. NEVILL, Journ. Asiatic Soc. 

 Bengal, vol. 50, pt. 2, 1881, p. 140. 



The position of this species is quite uncertain. It may 

 possibly be a Gastrocopta or one of the Pupillinae. For a 

 shell of this group or of Gastrocopta to have well-developed 

 columellar and palatal teeth and no parietal is anomalous. 

 In dead shells the latter sometimes scales off with the parietal 

 callus. It appears that only one specimen was found. 



