264 FERUSSACIA, SECTION PEGEA. 



deeply descending at the aperture, the free margin convexly 

 arcuate. Aperture rather narrowly arcuately subpiriform, 

 acutely elongated above ; peristome unexpanded, simple, a 

 little obtuse, slightly thickened. Columella short, vertical, 

 somewhat twisted, truncate below, somewhat calloused. Right 

 margin lightly concave-arcuate ; margins joined by a rather 

 conspicuous callus continuous with the columella. Length 9, 

 diam. 3.66, aperture 4.25 mm. (Palad.}. 



Morocco, drift of the Souani near Tangier, type loc. ; Douk- 

 kala (Kleinschmidt). 



F. mabilleana PALAD., Revue et Mag. de Zool. 1875, p. 89, 

 pi. 6, f. 19-22. MORELET, Journ. de Conchyl. 1880, p. 59.- 

 PALLARY, J. de C. 189, p. 124, pi. 9, f. 4. KOBELT, Iconogr. 

 vii, p. 28, pi. 186, f. 1182. MARTENS, Nachrbl. der D. Malak. 

 Ges. 1900, p. 122. 



This form has a marked resemblance to F. vescoi, but belongs 

 near F. debilis, according to Kobelt. Paladilhe reports debilis 

 from the same locality. 



57. F. DEBILIS (Morelet). PL 45, fig. 1. 



Shell small, narrowly ovate-fusiform, translucent, smooth, 

 very glossy, corneous-brown. Spire short, attenuate with acute 

 apex, whorls 6, slightly convex, irregularly increasing, separated 

 by a pale bordered suture, superficially appearing duplicated; 

 the first 4 increase slowly, the last two are much higher, of 

 nearly equal height. The last whorl comprises half or slightly 

 more of the total length, and tapers slightly below. Aperture 

 ovate-piriform, acute above; peristome thin, sharp, simple, the 

 outer lip arcuate and rather protracted; margins joined by a 

 thin callus. The parietal wall has no callus of any kind. 

 Columella short, straight, not reaching to the base, not tuber- 

 culate but covered with a whitish callus, indistinctly truncate 

 at the base. Length 7, diam. 3 mm. (Kobelt. ) 



Algeria: around Philippeville and Bona. 



Glandina debilis MOREL., Journ. de Conchyl. iii, 1852, p. 

 416, pi. 12, f. 6. Ferussacia d., BGT., Amen. Malac. i, p. 206, 

 pi. 19, f. 1-3; Malac. Algerie pi. 4, f. 20, 21. PFR., Monogr. 

 iv, 622; vi, 251. Kobelt, Iconogr. vii, p. 27, pi. 186, f. 1181. 



