228 FERUSSACIA. 



shape, less callous columella, and especially by the Streptaxis- 

 like aspect of the shell, due to the more swollen right than 

 left side, the columellar axis within the shell being a little 

 bent. It is a common shell in most of the countries border- 

 ing on the western basin of the Mediterranean. Whether it is 

 always distinguishable from F. folliculus is doubtful. 

 Bulimus nitidissimus Kryn. is probably either this form or 

 F. folliculus. 



Ferussacia dbnormis Nevill from Blidah, Algeria (and also 

 from Menton) seems to be a. half -grown specimen of F. vescoi 

 or of one of its immediate allies. Nevill subsequently pro- 

 posed for it the subgenus Pseudostreptostyla (P. Z. S. 1880, 

 p. 665). The original figure is copied, pi. 41, fig. 55. 



Bulimus nitidissimus Krynicki. Shell ovate-oblong, acu- 

 minate, imperforate, rather solid, pellucid, very glabrous, very 

 glossy, yellowish-corneous. Whorls 6, somewhat flattened, the 

 suture superficial, duplicated. Aperture long, angular, ob- 

 tuse in front; columella half the length of the lip, somewhat 

 twisted; peristome simple, whitish. Length 4.5, diam. 1.75 

 lines. Crimea. (Kryn. in Bull, de la See. Imp. des Natur- 

 alistes de Moscou, vi, 1833, p. 420; cf. Pfr., Monogr. ii, 284). 



Var. lanceolata Bgt. PL 41, fig. 50. Shell like the type 

 but less swollen, more lanceolate, longer ; length 10, diam. 3.5 

 mm. Around Algiers. 



Var. PROECHIA Bourguignat. PI. 41, figs. 61. 'The 

 proechia differs from F. vescoi (the only species with which 

 it can reasonably be compared), by the far more slender 

 shape, more elongate, less ventricose ; by the diminished colu- 

 mella, decidedly less calloused and less projecting; by the 

 piriform smaller aperture, rounded in ite outer margin; and 

 especially by the convex last whorl, proportionally much 

 smaller than that of vescoi. Length 9, diam. 3, aperture 3.25 

 mm." (Ferussacia proechia, BGT., Malac. de 1'Algerie i, p. 

 44, pi. 3, f. 26-28 (1864) ; Prodr. Malac. Tunisie p. 117. ? 

 Agathina folliculus var. elongata DEBEAUX, Rec. Soc. Agric., 

 Sci. et Arts d'Agen, viii, pt. 2, p. 328, 1857. (Boghar). 



Algeria: around Algiers (Let.) ; Blidah (Brondel), not com- 

 mon. Also Tunis. 



