GASTROCOPTA, MASCARENE ISLANDS, ETC. 131 



3 denticles, or with P. minutalis of Mayotte, with 6. Finally, 

 in P. monas, of Anjouan, also having 5 denticles, their ar- 

 rangement is absolutely different, not to speak of the size, 

 which in P. tripimctum is double that of the other (Morelet). 

 This species, which is figured from topotypes received 

 from M. E. Marie, doubtless part of the original lot, is very 

 closely related to G. seignaciana and G. microscopica. It 

 differs by having a higher lobe on the angulo-parietal lamella 

 ( pi. 23, fig. 7 ) , which gives that tooth a strongly bifid aspect 

 in a front view, similar to the American G. procera or barba- 

 densis. There is no material difference between tripimctum 

 and microscopica in the palatal and basal plicae. It seems 

 likely that Morelet 's measurement was too liberal he may 

 have guessed at it. His figure is copied, pi. 23, fig. 5. The 

 specimen figured (figs. 7, 12) measures, length 2.15, diam. 1 

 mm., and the smallest individual seen is 1.9 mm. long. 



76. GASTROCOPTA MICROSCOPICA (Martens). PI. 23, figs. 8, 13, 

 14, 15. 



Very small, 2 l / s mm. long, not quite 1 broad, cylindric 

 ovate, dark brown, glossy, smooth; 5 weakly convex whorls, 

 the upper three more rapidly increasing in width than the 

 following. Aperture % mm. long, ovate, with weakly re- 

 flected margin ; a tooth on the parietal wall near the outer 

 angle, a strong one on the columella, and two within the outer 

 lip, of which the upper is smaller than the lower (von Mar- 

 tens). 



Seychelles: Mahe, Anse aux Pins, under fallen cocoanut 

 leaves, on the shore plain; Island aux Fregates (east of 

 Mahe), on old, fallen cocoanut shells (Dr. Aug. Brauer). 



Pupa microscopica Nev., VON MARTENS, Land- und Siiss- 

 wasser-Mollusken der Seychellen, in Mittheilungen aus der 

 Zoologischen Sammlung des Museums fiir Naturkunde in 

 Berlin, i, March, 1898, p. 25, pi. 2, f. 19. 



? Pupa- (Vertigo) microscopica G. NEVILL, Hand List Mol- 

 lusca in the Indian Museum, Calcutta, i, 1878, p. 197 ("Cary- 

 chium mauritianum of Mascarene collectors"). 



Nevill gave no description of his species P. microscopica, the 



