230 FERUSSACIA. 



length, buff-whitish at the suture. Aperture lunate-oblong, 

 angular above, whitish within, peristome unexpended, acute, 

 whitish- thickened somewhat within; columella straight, whit- 

 ish, twisted within; outer margin regularly arcuate in front, 

 the margins joined by a whitish callus. Length 8.5, diam. 

 4, length of aperture, 3.75 mm. (Bgt.). 



Algeria: Algiers (type loc.), Bougie, etc.; Tunis. 



Achatina nitidissima FORBES, Ann. of Nat. Hist., or Mag. of 

 Zool. Botany and Geology, ii, p. 253, pi. 12, f. 2 (Dec. 1838). 

 Not Bulimus nitidissimus Kryn., 1833, also a Ferussacia. 

 Ferussacia forbesi BGT., Amenites Malacologiques i, p. 204, 

 in Revue et Mag. de Zool. 1856, p. 334; Prodr. Malac. Tunisie 

 p. 117. PFB., Monogr. iv, p. 621 ; vi, p. 248. 



11 Differs from F. amauronia by the irregular increase of 

 the whorls, more arcuate outer margin, etc. ' ' 



10. F. STENOPHYA ( Westerlund ) . 



Shell related to Cionella forbesii, but slender, cylindric-fusi- 

 form. Whorls 6, the upper 3 very narrow, together hardly 

 equal to the antepenultimate, this being half the length of the 

 penultimate whorl, which scarcely attains two-thirds the 

 length of the last. Last whorl a little depressed at the 

 aperture, narrowed towards the base. Suture delicate, mar- 

 gined. Aperture piriform, the outer margin strongly arched 

 forward below the middle. Columella short, straight, white. 

 Length 7, diam. 2 mm. (West.) 



Algeria: debris of the Harrach (Ancey). 



Cionella (Ferussacia) stenophya WESTERLUND, Verhandl. 

 k. k. zool.-bot. Ges. Wien, xlii, 1893, p. 43. 



11. F. EXTREMA (Westerlund). 



Shell related to Cionella forbesii Bgt. but with 5 whorls, the 

 first two most minute, standing out from the rest; the first 

 three together hardly more than one-third the height of the 

 penultimate whorl ; penult, whorl very long, as long as the last 

 or longer, with parallel sides. Suture broadly margined be- 

 low by a white callous line, dark-edged below, and extending 

 to the apex. Aperture piriform; columella callous; margins 



