FERUSSACIA, SECTION PEGEA. 263 



simple, margins joined by a diaphanous callus. Length 9r5,- 

 diam. 4 mm. (Bgt.). 



Algeria: Rocks of Mansurah near Constantine (Brondel); not 

 found there by Kobelt. 



F. cirtana BGT., Moll, nouv., litig., etc., ii, p. 256, pi. 37, f. 

 6-8. PFR., Monogr., viii, p. 302. KOBELT, Iconogr., p. 31. 



Distinguished by its swollen shape, short spire and the ab- 

 sence of a parietal lamella. 



65. F. ENNYCHIA Bourguignat. PL 45, fig. 26. 



Shell slender, cylindric, pellucid, diaphanous, smooth, pol- 

 ished, very glossy, tawny-buff. Spire attenuate, conic, apex 

 acute. Whorls 6, flat, separated by a paler corneous super- 

 ficially duplicated suture ; the upper whorls minute, slowly 

 and regularly increasing ; the third large, suddenly enlarging, 

 swollen on the left side; the last whorl not half the total length. 

 Aperture ovate-oblong; peristome simple, acute, unexpanded, 

 columella straight, slightly twisted or sinuous. Outer margin 

 a little arcuate; margins joined by a thin callus. Length 9, 

 diam. 3, aperture 4 mm. (Bgt.). 



Algeria: around Bona, type loc. ; Tunis at Ain-Draham, 

 opposite the island of Tabarque. 



F. ennychia BGT. Rev. et Mag. Zool. 1856, p. 332; Amen. 

 Malac. i, p. 202, pi. 19, f. 10-12; Malac. de PAlgerie ii, p. 87, 

 pi. 4, f. 17-19; Prodr. Malac. Tunisie p. 126. PFR., Monogr. 

 iv, 620. KOBELT, Iconogr. vii, p. 29. 



Close to F. mabilleana, but longer, more cylindric, with one 

 more whorl. 



56. F. MABILLEANA Paladilhe. PL 45, fig. 27. 



Shell imperf orate, cylindric-lanceolate, slightly subpellucid, 

 rather solid, smooth, glossy, pale slightly greenish buff; spire 

 attenuate, subobliquely conoid, apex a little obtuse, rather 

 projecting and submamillate. Whorls 5, slightly convex, sep- 

 arated by a linear, paler-margined suture, the earlier ones 

 slowly, the later very rapidly increasing, the first two minute, 

 with horizontal suture, third large, subgibbous on the left side, 

 the suture below very oblique, fourth whorl very long, cylin- 

 dric-subovate. Last whorl half the total length, regularly and 



