CvEOILIOIDES OF SICILY. 25 



17. C. ACTONIANA (Benoit). PI. 2, figs. 20, 21, 22. 



Shell oblong- fusiform, slightly swollen, very thin, very 

 glossy, hyaline, corneous-yellowish. Spire turrite-conic, the 

 apex obtuse, suture deep, indistinctly margined. Whorls 5, 

 convex, very rapidly increasing, the last nearly longer than the 

 spire. Columella a little arcuate, very narrowly truncate at the 

 base. Aperture ovate-oblong; peristome simple, unexpanded, 

 acute; margins joined by a thin callus. Length 4, diam. 1.5, 

 aperture 1.5 x 1 mm. (Ben.}. 



Sicily: Around Palermo (Benoit). 



Achatina actoniana BEN., Illustr. Test, estramar. Sicilia, 

 1862, p. 244 ("pi. 10, f. 8," unpublished). PFR., Monogr., 

 vi, p. 242. Cacilianella a., BENOIT, Catalogo, p. 87. Cionella 

 a., WESTERLUND, Fauna, iii, p. 172. 



Figured from specimens received from Benoit, fig. 20 repre- 

 senting the adult, 4.3 x 1.3 mm., figs. 21, 22 the immature 

 form, 3.7 x 1.2 mm. It is very similar to C. petitiana, from 

 which it differs in little but the smaller size, in specimens of 

 apparently equal age. It is practically identical with C. rizzeana, 

 though the mouth may be a thought narrower, in the specimens 

 compared. The Madeiran C. nyctelia is conchologically not 

 distinguishable. 



Var. rizzeana (Benoit). PI. 2, figs. 26, 27. Shell long-fusi- 

 form, thin, polished, glossy, hyaline, whitish-buff. Spire 

 tapering-turrite, the apex mamillate; suture impressed, very 

 narrowly margined. Whorls 6, a trifle convex, the first 4 

 regularly increasing, the last 2 very rapidly descending, the last 

 two shorter than the spire, two-fifths the total length. Colum- 

 ella subarcuate, abruptly and broadly truncate, not reaching to 

 the base. Aperture oblong- acuminate, rather narrow; peristome 

 simple, unexpanded, acute, the margins joined by a rather thick 

 white callus. Length 4.5, diam. 1.75, aperture 2x0.75 mm. 

 (Ben.). 



Sicily : vicinity of Palermo, type loc. ; banks of the Simeto, 

 Plain of Catania (Benoit); Province of Syracuse, in debris of 

 of the Anapo (Cafici). 



Achatina rizzeana BEN., Illustr. Test, estramar. Sicilia, 1862, 

 p. 245, pi. 8, f. 10. Ferussacia r., BGT., Rev. et Mag. de Zool. 



