286 CALAXIS. 



This is a somewhat variable species, in which a second parietal 

 tooth is sometimes developed, sometimes only indicated, or 

 wholly wanting. The palatal plica is sometimes stronger, 

 sometimes weaker, and occasionally doubled. Westerlund and 

 Kobelt agree that the several forms described by Bourguignat, 

 as well as the var. discrepans of Mousson, are merely forms of a 

 single species. I give below the alleged differential characters 

 and copies of the original figures. 



Var. discrepans Mousson. 



A little larger, whorls slightly convex, the last shorter, sub- 

 angular above and below, not over one-third the total length; 

 columella strongly armed, lamella smaller. A single example 

 found among the typical form, leaves it doubtful whether this 

 is a good variety or merely an exceptional variation. 



Var. rothi Bourguignat. PL 45, figs. 30. 



Differs from F. hierosolymarum by the more lanceolate shell, 

 less ventricose, the more regular increase of the whorls, the spire 

 a little longer, the parietal lamella especially more compressed, 

 more projecting, less thick, by the columella terminating in a 

 lamella which becomes nearly flat at the base, while in hiero- 

 solymarum the columella is simply twisted by a lamelliform fold 

 which descends obliquely; finally by having two palatal plicae 

 within the outer lip. Length 7, diam. 2.25 mm., whorls 8. 



Jeruselam (Roth). 



Ferussacia rothi BGT., Malac. Algerie, ii, p. 31; Rev. et Mag. 

 Zool., 1864, p. 193, pi. 18, f. 13-16; Moll. nouv. litig. etc., iv, 

 p. 108, pi. 19, f. 13-16. 



Var. moussoniana Bourguignat. PL 45, fig. 33. 



Distinguished from F. rothi by the more lanceolate shell, a 

 little more globular at the base, by the more dilated basal part 

 of the aperture; the columella armed with two lamelliform 

 folds, an upper and a lower, while in rothi there is only one. 

 Length 7, diam. 2 mm. , Whorls 8 to 9. 



Around Jerusalem, Bethlehem, etc., very abundant under 

 stones and rocks. 



F. moussoniana BGT., Malac. Algerie, ii, p. 31 (Jan., 1864); 



