112 AURIS-EUDOLICHOTIS. 



The slender form, vertically plicatulate sculpture, less pinched 

 base, less sinuous outer lip and consequent lack of excavation be- 

 hind it, would entitle this to rank as a species distinct from distorta 

 were it not for the intermediate specimens I have seen, which do 

 not allow me to retain it specifically apart. 



Var. BISUTURALIS Pils. PL 44, figs. 81, 82. 



Shell with the spire more slender and whorls more convex than in 

 A. distorta, solid, fleshy or buff whitish, with a few oblique stripes 

 or none. Surface with the growth-wrinkles somewhat sinuous or 

 interrupted on the last whorl, about as in A. glabra. Whorls 5, 

 separated by impressed sutures, which are bordered below by a nar- 

 row margin defined by a distinct groove ; the last whorl compressed 

 at base and behind the peristome. 



Aperture more open than in any other form of A. distorta, much as 

 in A. glabra, the outer lip less calloused within than in A. distorta 

 var. guairensis ; base moderately produced. Columella with the 

 usual convex fold, bearing a rather deep-seated, narrow, subhori- 

 zontal callous flange on its lower edge. Parietal wall white or 

 faintly brownish. 



Alt. 44, diam. 18 mill. 



Alt. 40*, diam. 17-1 9 mill. 



San Jose de Cucuta, Colombia (E. S. Penny, in Swift Coll.). 



The aperture is more open and the columellar fold is very much 

 less developed than in A. distorta ; but the compressed base and 

 form of the columellar fold forbid a union with A. glabra. Five 

 specimens examined. 



A larger specimen, more variegated with brown, and without the 

 superimposed narrow callus on the columella, but still, in my opin- 

 ion, referable to this subspecies, is before me, labelled " Bogota, N. 

 G., J. Akhurst." 



A. AURISSCIURI Guppy. PI. 41, figs. 42, 43, 44. 



Shell umbilicate, ovate-fusiform, generally rather thin and diaph- 

 anous, sometimes more solid and opaque. Whitish, with obliquely- 

 descending stripes of brown or purple-brown, sometimes interrupted 

 and anastomosing. Surface smoothish, rather faintly wrinkle-striate, 

 the stria; more or less broken into diamond-granules on the base. 

 Whorls slightly over 5, the last flattened and more or less excavated 

 behind the lip, the base prolonged and decidedly pinched. 



