242 PERUSSACIA, SECTION PEGEA. 



24. F. LAMELLATA Bourguignat. 



Shell elongate, fragile, translucent, glossy, somewhat whit- 

 ish, very delicately striate, polished ; spire produced, tapering 

 to the obtuse summit ; apex obtuse. Whorls 6, a trifle convex, 

 the penultimate more convex ; slowly increasing to the penul- 

 timate, then rapidly increasing ; suture impressed ; last whorl 

 moderate, one-third the total length, scarcely convex at the 

 beginning, more, convex at the aperture. Aperture vertical, 

 rather lunate, irregularly oblong, arcuate outwardly, angular 

 above, having a strong lamella on the parietal wall. Colu- 

 mella straight, acuminate, above slightly toothed within ; peris- 

 tome unexpanded, acute, the outer margin lightly arcuate; 

 margins joined by a very thin callus. Length 10, diam. 3, 

 aperture 3 mm. (Bgt.). 



Algeria : neighborhood of Boghar ; Tunis : ruins of Carthage. 



Ferussacia lamellata BGT., Prodr. Malac. Tunisie, p. 118, 

 1887. 



Resembles F. proechia in shape. 



25. F. MARGINATA ( Westerlund) . 



Shell cylindric-fusiform, fragile, glossy, corneous-reddish. 

 Spire perceptibly attenuate above, the apex obtuse. Whorls 

 6, a little convex, the upper rather regularly increasing, the 

 last two rapidly ; taken together their length on the left side 

 more than two-thirds, on the right nearly three-fourths, and 

 the last whorl alone one-half the total length. Suture super- 

 ficial, nearly horizontal above, very oblique in the middle, be- 

 coming slightly oblique at the aperture, throughout having a 

 white, strongly callous margin. Aperture narrowly piriform, 

 long and narrowly produced above, nearly 4 mm. long ; parie- 

 tal lamella rather immersed, high, compressed, below the 

 middle of the parietal wall; columella white, acute, a little 

 twisted, at the base noticeably running out; outer margin 

 vertical, very lightly arcuate. Length 8, diam. 2.5 mm. 

 (Westerl) 



Algeria: Blidad (Ancey). 



Ferussacia marginata WESTERL., Bull. Soc. Malac. de 

 France, v, 1888, p. 63. 



