FERUSSACIA, SECTION PEGEA. 251 



pressed suture, sublinear between the last whorls. Last whorl 

 slightly more than one-fourth the total alt., a little convex, 

 thick at the base. Aperture vertical, irregularly oblong, 

 three-toothed, a parietal lamella, a denticle on the upper 

 part of the columella, and the third strong and tuberculiform 

 in the outer wall. Columella straight, robust, thick; peris- 

 tome unexpanded, obtuse, thickened as though labiate, the 

 outer margin arched in a little in the middle, margins joined 

 by a strong callus. Length 13, diam. 4, aperture 5 mm. (Bgt.) 



Tunis: Djebel Resas (or Rsass). 



F. polyodon L. & B., Prodr. Malac. Tunisie p. 122, 1887. 



F. doumeti Bourguignat. Shell swollen, rather short, ob- 

 long-egg-shaped, glossy, subpellucid, corneous, very sharply 

 striatulate, polished; spire little produced, 'abruptly tapering 

 and at the summit rapidly acuminate, the apex very minute. 

 Whorls 7, slightly convex, the upper four very small, closely 

 coiled (ias in F. maresi), fifth large and swollen, the rest ample 

 and oblong, separated by a linear suture, usually marked 

 with a white line at the last whorl. Last whorl large, nearly 

 half the total length, a little convex. Aperture vertical, ob- 

 long, angular above, whitish and with a strong parietal la- 

 mella within. Columella. short, thick, white, straight, acum- 

 inate, strongly denticulate within above, the denticle visible 

 in oblique view. Peristome unexpanded, obtuse, white- thick- 

 ened within; outer lip slightly arcuate, margins joined by a 

 callus. Length 13, diam. 5, aperture 6 mm. (Bgt.). 



Tunis : Djebel Bou-Kournein, type loc. ; El-Aouina ; 

 Cartilage. 



F. doumeti BGT., Prodr. Malac. Tunisie p. 123, 1887. 



Var. PAULUCCIANA Pollonera. PL 43, fig. 10. 



Differs from F. carnea by the less swollen shell, generally 

 smaller, the spire regularly tapering and higher, the penulti- 

 mate whorl not inflated, last whorl smaller, the aperture less 

 high. Length 11 to 12, diam. 3.75 to 4, aperture 4.25 to 4.5 

 mm. (Poll.). 



Italy: island of Pianosa. 



Ferussacia carnea ISSEL, Crociere del 'Volante' 1878, p. 46, 



