AG-VRDHIA. 147 



ceding, the last one perfectly rounded at base; the aperture 

 much shorter and less contracted, with much less conspicuous 

 folds, which are further within; the columellar margin more 

 broadly reflected but less callous, without any twist or deflec- 

 tion whatever, scarcely oblique, almost rounded at base ; outer 

 margin with its well-developed tooth as in the type form. 

 Long. 4, diam. 1% mm. 



"Unique type var., Indian Museum, Calcutta" (Nevill). 



4a. A. bourguignatiana ligustica (Poll.). PI. 16, figs. 6, 7. 



Shell cylindric, narrowly umbilicate, pellucid, glabrous; at 

 the apex obtuse, somewhat tapering. Under a strong lens it 

 is seen to be slightly striatulate. Ten slightly convex whorls, 

 the last compressed, obtusely carinate around the umbilicus; 

 suture moderately impressed. Aperture is oblique, subtri- 

 angular, subangular below; the peristome strong, reflected, 

 continuous. One very strong, emerging parietal lamella, 

 penetrating very far inward. One strong, thick, transverse 

 columellar lamella situated high. Outer lip having a conic 

 tooth. Three (sometimes 4) slender, short, deeply placed 

 palatal folds, the lowest one punctiform, rudimentary. Length 

 4%-5, diam. V/ 2 mm. (Pollonera). 



Italy: Genoa (type loc.) and its environs; also drift of the 

 upper Scrivia river in Piedmont at monte di Tortona (Pollo- 

 nera) ; Rapallo (J. and A. L. Baily) ; debris of the Torrento 

 di Sturla at Genoa (Flach). 



Pupa ligustica Pollonera, Bull. Soc. Malac. Ital., xii, 1886, 

 p. 214, pi. 6, f. 9, 10. — Flach, Verh. phys.-med. Ges. Wiirz- 

 burg, xxiv, 1890, p. 6, footnote 1, as doubtfully distinct from 

 biplicata. 



The description and figures are from Pollonera. He fur- 

 ther notes that 



A. ligustica is related to A. bourguignatiana Nev., a Men- 

 ton fossil, but the last whorl is contracted and the aperture 

 somewhat channelled below. It differs chiefly from A. bipli- 

 cata by the strong contraction of the last whorl below, the 

 carina around the umbilicus being far more pronounced; the 

 aperture is longer, more angular below; the peristome more 

 solid and almost continuous, with a stouter tooth. The palatal 

 folds are shorter, slighter, and much more deeply placed. 



