42 HELIX. 



margined; whorls 8, flat, acutely carinated, the last subgibbous and 

 shortly deflected in front, base convex, yellowish, with two (or rarely 

 one) wide chestnut bands; peristome subsimple, thickened below. 



Diam. 16 mill. 



Ins. Deserta Grande, near Madeira. 



It is If. Bulverii. var. /5, of Albers. 



H. ALBERSI, Lowe. PI. 9, figs. 84-86. 



Narrowly umbilicated, slightly granular, corneous, with chestnut 

 bands, suture obsolete ; whorls 8, narrow, slowly increasing, the last 

 a little descending in front, periphery acutely carinated, base convex. 



Diam. 14-16 mill. 



Porto Saneto. 



Smaller and paler colored than the next species, with less cylin- 

 drical umbilicus and less prominent carina, spire more rectilinear. 



This is H. Bulverii, var. p, of Pfeiffer. 



H. BULVERII, Wood. PL 9, fig. 88. 



Narrowly umbilicated, somewhat solid, minutely striate, and very 

 minutely granulated, fulvous, marbled and banded with chestnut, 

 suture obsolete; whorls 8, flat, narrow, slowly increasing, the last 

 acutely carinated, flatly convex below ; peristome simple, thickened 

 on the base. Diam. 17 mill. 



Ins. Porto Saneto. 



H. rota, Pot. et Mich., H. Bulveriana, Lowe, and H. variegata, 

 Menke are synonyms. 



H. TECTIFORMIS, Sowb. PI. 9, figs. 89, 90. 



Narrowly umbilicated, rather thin, calcareous, slightly striate 

 above, closely granular beneath ; whorls 7, planate, slowly increasing, 

 the last acutely carinated, carina wide, deflected downwards; aper- 

 ture trapezoidal, peristome acute, simple above, deflected at base. 



Diam. 16 mill. 



Ins. Baxo, near Porto Saneto, 

 Var. LUDOVICI, Albers. Fig. 90. 



Somewhat larger, spire a little more dome-shaped, carina not so 

 acute. 



Semifossil, (extinct?). 



H. ARGONAUTULA, Webb and Berthelot. PI. 9, figs. 91-93. 



Moderately umbilicated, rather thin, closely costulate, ash colored 

 with a single band above and another below, tessellated with white 



