186 HELIX-SOL AROPSIS. 



H. PASCALIA Cailliaud. PL 54, figs. 17, 18, 19, 20. 



Umbilicate, depressed, rather solid, light chestnut-brown, with 

 several narrow bands composed of arrow-shaped chestnut spots 

 above, several lines of similar composition beneath ; one band is 

 immediately above the peripheral carina, and sometimes all others 

 on the superior surface are obsolete ; there are usually a few ir- 

 regular short dark streaks below the suture, well shown in figure 18. 

 The surface lightly substriate and densely granulate ; but the 

 granules are not at all arranged into patterns or lines ; the spire is 

 low-conoidal, obtuse ; whorls 5, regularly widening, the last carinated 

 around the middle, convex beneath. Aperture oblong-lunar, 

 bluish-lilac inside, slightly oblique ; peristome narrowly expanded 

 and reflexed, dark purplish-brown, outer margin well curved, basal 

 straighter, columellar margin arcuate, dilated partly over the 

 umbilicus. 



Alt. 17, diam. maj. 40, min. 35J mill. ; of umbil. 3 mill. 



Alt. 16, diam. maj. 37, min. 31 mill.; of umbil. 2J mill. 



Brazil. 



H. paxcalia CATLL. in Journ. de Conchyl. 1857, p. 102, t. 2, f. 3. 

 -PFEIFFEK, Mon. Hel. Viv., iv, p. 350. DOHRN in Jahrb. d. 

 Mai. Gesell. 1882, p. 102. H. amazonica HUPE, in Casteln., Exped. 

 dans 1'Ainer. du Sud Moll., p. 9, t. 1, f. 1 (not amazonica Pfeiffer). 



This species may be known by the dense granulation, the granules 

 not arranged in lines nor coalescent into folds, the pallid coloration, 

 nearly obsolete spiral bands, and the dark purplish-brown peristome. 

 A very pale whitish, translucent color-variety before me is figured 

 (figs. 19, 20). Hupe's figures of this species which he calls "H. 

 amazonica, " are given on pi. 59, figs. 58, 59. 



H. AMAZONICA Pfeiffer. PL 59, fig. 60. 



Umbilicate, depressed, solid, closely undulate-plicate above and 

 subgranulate, spotted with red at sutures and cariua ; spire scarcely 

 elevated, obtuse ; whorls 5, a little convex, regularly widening, the 

 last not descending, subacutely carinated at the periphery ; the base 

 inflated, closely radiately striate, yellowish- white, multi-fasciate 

 with red ; umbilicus narrow, pervious ; aperture a little oblique, 

 angulate-lunar, margaritaceus inside ; peristome narrowly reflexed, 

 the superior margin nearly horizontal, basal margin arcuate, 

 columellar margin expanded into a triangular plate. (-P/V*.) 



Alt. 23, diam. maj. 53, min. 41 mill. 



Along the Amazon River. 



