FERUSSACIA, SECTION PEGEA. 261 



spreading, the outer lip a little arcuate; margins joined by a 

 strong callus. Length 12, diam. 4, aperture 5 mm. (Bgi.}. 



Tunis: rock-crevices north of Porto Farina. 



F. berthieriBGT., Prodr. Malac. Tunisie, p. 125. 



51. F. MICROXIA Bourguignat. PI. 44, fig. 22. 



Shell lanceolate-piriform, pellucid, very glossy, very smooth, 

 uniform corneous, obscurely radiate around the suture as in 

 F. abromia, or encircled by a paler zone. Spire oblong, rather 

 suddenly attenuate at the upper whorls, apex obtuse, mamillate. 

 Whorls 7, a little convex, the first irregularly, last rapidly in- 

 creasing, separated by a paler, superficially duplicated suture; 

 last whorl large, over one-third the total length, regularly de- 

 scending to the aperture. Aperture nearly vertical, lunate- 

 oblong, angular above and below, having a narrow, deeply 

 placed parietal lamella. Columella twisted, whitish, callous, 

 with a very strong lamella above. Peristome whitish, a little 

 thickened, the outer margin slightly arcuate in front, margins 

 joined by a thin callus. Length 12, diam. 3.5 mm. (Bgt.~). 



Algeria: Ued Cheliff, prov. Oran. 



F. microxia BGT., Moll, nouv., litig., etc., 1868, p. 303, pi. 

 43, f. 14-16. PFR., Monogr., viii, p. 309. KCBELT, Iconogr., 

 vii, p. 32. 



52. F. CELOSIA Bourguignat. PL 44, fig. 21. 



Shell cylindric-fusiform, lanceolate, solid, very glossy, sub- 

 pellucid, smooth, amber-orange, especially towards the aperture. 

 Spire lanceolate-acuminate, the apex projecting, a little obtuse, 

 as though mamillate, whitish, calcareous. Whorls 7^ to 8, 

 flattened, irregularly increasing as in F. sciaphila, separated by 

 a paler, superficial, duplicated suture. Aperture narrowly 

 oblong, angular above, somewhat whitish within, with a 

 deeply placed whitish parietal lamella; columella straight, 

 whitish, bicallose, the upper callus stronger. Peristome unex- 

 panded, lightly thickened; outer margin strongly arched for- 

 ward, margins joined by a transparent but rather thick callus. 

 Length 11.5, diam. 3.25, aperture 5 mm. (Bgt.}. 



Algeria: Bona, type loc. Tunis: Bizerte. 



