PSEUDOPEAS. 119 



separated by a deep and somewhat oblique suture, the last 

 whorl long, nearly half the total length. Aperture vertical, 

 oblong, acuminate above ; peristome thin, simple and acute ; 

 colurnellar margin straight, a little reflexed and thickened. 

 Length 2.75, diam. 1.5, aperture 1.5 x 1 mm. (Jick.) . 



Abyssinia: Bogu Valley, Bogos (Beccari). 



Subulina isseli JICK., Fauna der Land- und Siisswasser- 

 Mollusken Nord-Ost-Afrikas, in Nova Acta K. Leop-Carol. 

 Deutschen Akad. der Naturforscher, xxxvii, 1874, p. 138, pi. 

 5, f. 22. Beccaria isseli BGT., Malac. Abyss., in Ann. Sci. 

 Nat. xv, 1883, p. 119. 



Described from a single specimen thought by Jickeli to be 

 not full grown. 



8. P. PUSILLUM (Morelet). PI. 25, figs. 14, 15, 16. 



"Shell very small, rimate, turrited, rather thin, whitish 

 horn-color, shining, minutely costulate, apex somewhat obtuse. 

 Whorls 51/2, plano-convex, joined by a moderately impressed 

 suture, a little terraced, the last nearly equal to one-third of 

 the entire length of the shell. Aperture oval; peristome 

 simple, acute, columellar margin descending vertically, 

 shortly reflexed as far as the base. Length 3, diam l 1 /^ mm. ' ' 

 (Morelet). 



Comoro Islands: Mayotte (Mane). 



Stenogyra pusilla MORELET, Journ. de Conch. July, 1881, 

 p. 220, pi. 10, f. 4. Not Achatina pusilla Pfr., nor Bulimulus 

 (Ena) pusilla Ad. 



"This shell, of which I have two fully adult specimens be- 

 fore me, is doubtless the smallest species of the genus. Its 

 minute size is sufficient, in the absence of all description, to 

 make it recognizable. The five whorls 'of w r hich the spire is 

 composed are plainly separated and even a little turriculate ; 

 the first two are smooth, the remaining finely costulate. The 

 columella is straight but truncate." (Morelet). 



Figured from specimens received from Marie. The con- 

 spicuously ribbed surface and diminutive size distinguish it 

 from other species of the Comoros. The protoconch has 

 sparse, almost subobsolete spiral striae. 



