FERUSSACIA, SECTION PEGEA. 257 



44. F. YEFFRIANA Pallary. PI. 44, fig. 16. 



This species is characterized by the outer margin more arched 

 forward than in any other Ferussacia. In shape it is most re- 

 lated to F. gracilenta Morelet, but our species is distinguished 

 by the large size, more ventricose form, the upper apertural 

 lamella a little indicated, and especially by the advance of its 

 peristome. In F. yejfriana, as in F. gracilenta, the upper whorls 

 are coiled regularly and then present a noticeable deviation at 

 the penultimate whorl. Length 9.5, diam. 3.25 mm. (Pallary}. 



Algeria: Oran, in the cool ravines of the massif of Djebel 

 Yeffri. 



Ferrussacia yeffriana PALL., Compte Rendu cle la 29me Ses- 

 sion de 1' Association Francaise pour 1'Avancement des Sciences 

 Paris, 1900, p. 734, pi. 11, f. 15-18 (1901). 



45. F. DIODONTA Bourguignat. PI. 44, fig. 20. 



Shell slender, long-fusiform, glossy, pellucid, smooth, pale 

 corneous; spire slowly tapering, the apex a little obtuse, whorls 

 6, slightly convex, irregularly increasing, the first whorls rather 

 regularly, the last rapidly increasing, separated by a superficial 

 paler and bordered suture; last whorl more than half the total 

 length. Aperture long-piriform, with a minute, deep-seated 

 median parietal lamella and a whitish oblong palatal lamella. 

 Columella whitish, straight, lightly calloused above; peristome 

 unexpanded, acute, the outer lip arching forward, margins 

 joined by a very thin callus. Length 10.5, diam. 3, aperture 

 4.5 mm. long. (Bgt.}. 



Algeria: Valley of Ued Djebarra, Oran, type loc. 



F. diodonta BGT., Rev. et Mag. Zool., 1868, p. 375, pi. 15, 

 f. 9-13; Moll. nouv. litig., etc., p. 271, pi. 40, f. 9-13. PFR., 

 Monogr. , viii, p. 309. KOBELT, Iconogr., vii, p. 26, f. 1178 

 (copied from Bgt. ). 



Remarkable for its palatal plica. Known from the type lot 

 only. 



46. F. SUBGRACILENTA Bourguignat. 



Shell elongate, cylindric, shortly acuminate at the summit, 

 slightly dilated below, glossy, translucent, fragile, pale corneous; 

 spire cylindric-elongate, almost suddenly acuminate at the sum- 



