180 HELIX-SOL AROPSIS. 



H. pellisserpent is ; this is not the case with the next species, which 

 in other characters seems to be closely allied. 



H. PELLISBCLE Hupe. PI. 57, figs. 23, 24, 25. 



Orbiculate-depressed ; the spire obviously convex, obtuse, com- 

 posed of 6 narrow convex whorls united by a well-marked suture; 

 last whorl nearly rounded ; it has a slightly marked angle in the 

 middle, seen from the front; it is very convex and almost smooth, 

 often with growth-stride on the spire ; these stria? are well marked 

 and make the surface a little rugose. The aperture is transverse, 

 half-round; the margins are nexuotis and reflexed at the edge in 

 a thick white peristome ; umbilicus narrow. The coloration consists 

 of a fawn-colored ground, with a wide descending band at the sut- 

 ure; this band is composed of angular spots alternately brown and 

 white; another band, narrower, but the same in composition, 

 occupies the angle of the last whorl ; the base and aperture are 

 fawn color, with several marked traces of darker transverse lines. 

 (Hupe.) 



This species superficially resembles H. pellisserpentis [H. serpens 

 Martyn ! ], but is distinguished by its more regularly orbicular form, 

 more depressed appearance, narrower whorls of the spire, marked by 

 rugose growth-lines ; finally, the base is more convex ; the spots are 

 larger. (Hupe.) 



Alt. 25, diam. maj. 55, min. 48 mill. 



Mission of Sarayacu, Peru. 



H. pellis-boce HUPE in Rev. et. Mag. de Zool. 1853, p. 299, t. 9. 

 H. boa HUPE, in Castelnau, Exped. dans 1'Amer. du Bud., Moll., 

 p. 6, t. 1, f. 4. H. jjellix BOCB PFR. Monographia Hel. Viv., iv, p. 

 285. 



Evidently closely allied to H. serpens Martyn ; but the whorls of 

 the spire show no trace of the peripheral band, and are rugose- 

 striate. 



H. AXKUICULA Hupe. PI. 54, figs. 24, 25, 26. 



Orbicular depressed ; spire obtuse, a little convex, formed of 5 

 narrow convex whoils ; the last whorl is rounded, without peripheral 

 angle; all are covered with well-marked transverse strise. The 

 aperture is large, nearly semilunar, the umbilicus is rounded and 

 pretty wide. The whole shell is fawn-colored beneath ; it is orna- 

 mented with series of brown spots forming rather numerous concen- 

 tric lines. The aperture and peristome are white. The upper 



