256 FERUSSACIA, SECTION PEGEA. 



ate. Peristome unexpanded, acute; outer margin nearly 

 straightly descending but still lightly receding at base, the 

 margins joined by a transparent, hardly visible callus. 

 Length 10, diam. 3, aperture 3.25 mm. (Bgt.). 



Algeria: environs of Boghar, type loc. Tunis, Guelaat-es- 

 Snan and Foum-Goubel. 



F. lallemanti BGT., Prodr. Mai. Tunisie p. 125, 1887. 



F. pechaudi Bgt., is an undescribed form of this group 

 from Algeria. See Prodr. Malac. Tunisie p. 116, footnote 

 no. 2. 



Group of F. gracilenta. 



Shell more or less lengthened, always thin, fragile, and with 

 the whorls irregularly, but rather rapidly increasing. 



43. F. GRACILENTA (Morelet). PL 44, fig. 17. 



Shell elongate, almost fusiform, glossy, smooth, translucent, 

 of a handsome brownish-yellow color. Spire attenuate, with 

 rather acute apex; whorls more than 6, nearly or quite flat, 

 separated by a flat, pale-edged, only indistinctly duplicated 

 suture; upper whorls slowly increasing, the last two very 

 rapidly, the last less than half the total length, not tapering be- 

 low, but rather enlarged there. Aperture somewhat piriform, 

 acute above, wide below, shorter than the spire, A small, com- 

 pressed parietal lamella stands deep on the parietal wall, visible 

 in oblique view only. Columella quite short, callously thick- 

 ened, not truncate below, and in oblique view showing a 

 tubercle above. The outer lip is only a little arched forward in 

 the middle. Length 9, diam. 3, aperture 3.5 to 4 mm. (Kob.). 



Algeria: Cberchell, in the province of Algiers. 



Glandina gracilenta MORELET, Journ. de Conchyl., vi, 1857, 

 p. 41, pi. 1, f. 4, 5. Azeca gracilenta PFR., Monogr., iv, 649; 

 vi, 259. Ferussacia g. , BOURGUIGNAT, Rev. et Mag. Zool., xvi, 

 1864, p. 210. KOBELT, Iconogr., vii, p. 27, fig. 1180. 



The parietal lamella is not visible in a front view in the 

 specimens I have seen. It is very small and deeply immersed. 

 The outer lip arches well forward below the middle, in profile 

 view. 



