FERUSSACIA, SECTION PEGEA. 249 



Tornatellina fraseri Benson MSS., PFR. Monogr. Hel. Viv. 

 iii, p. 526; iv, 652; vi, 260. Helix munita FERUSSAC MSS., 

 teste Bgt. 



1 Achatina lamellifera Morel., BENOIT, Illustrazione siste- 

 niatica, critica, iconografica de' Testacei estramarini della 

 Sicilia etc., p. 242, pi. 5, f. 28. 



This is an exceedingly abundant species in Tunis, quite 

 variable, found in multitudes in the stony grain fields, and its 

 introduction in Italy was doubtless owing to accidental mix- 

 ture with exported grain. It was originally described from 

 Nice, but whether still found living there is not known. 

 Kobelt, who collected at the original localities, considers the 

 following Tunisian forms to be merely selected specimens, 

 described by Bourguignat "with sovereign disregard of 

 transitional and intermediate forms." 



F. stenostoma Bourguignat. Shell oblong-subfusiform, 

 little shining, a little opaque, thick and opaque on the last 

 whorl, towards the aperture, corneous, very delicately stria- 

 tulate, polished ; spire oblong, rather abruptly attenuate at the 

 summit, apex minute but still somewhat obtuse. Whorls 7, 

 slightly convex, regularly and slowly increasing to the penult., 

 then rapidly increasing, parted by a linear suture ; last whorl 

 large, a little convex, slightly tapering downward. Aperture 

 vertical, narrowly long-oblong, angular above and below, whit- 

 ish within, with a strong parietal lamella. Columella stout, 

 straight, lamellose, acuminate, yet subtruncate at base, within 

 it is subdenticulate above. Peristome unexpanded, obtuse, a 

 little thickened and whitish within; outer margin regularly 

 subarcuate, margins joined by a callus. Length 13, diam. 4, 

 alt. of aperture 5.5 mm. (Bgt.) 



Tunis : Ruins of Utique, type loc. ; Djebel Zaghouana near 

 the temple of Nymphs. 



F. stenostoma BGT., Prodr. Malac. Tunisie p. 121, 1887. 



F. gibbosa Bourguignat. Shell obese-oblong, rather tumid, 

 the left side more convex than the right as in F. gronoviana, 

 glossy, subpellucid, corneous, polished. Spire obese, little 

 produced, rather rapidly tapering, the apex a little obtuse. 

 Whorls 7, a little convex, the convexity slightly greater on 



