HELIX. 2K) 



rounded at periphery, subflattened below, and indented in tin- cen- 

 ter, anteriorly slightly deflexed ; aperture broadly srmioval, oblique. 

 whitish within, not showing the bands prominently : periMome nar- 

 rowly expanded, .slightly albolftbiate, its tipper and lower margin.- 

 subparallel, not converging ; columellar margin rellrxed, appro* ! 

 over the axis, dark colored, especially toward the uinhilical callu- : 

 parietal wall chestnut colored. Diara. 18, alt. 10 mill. 



Southern France ; Italy; Curxirn ; tin wl in in. 



An excessively mutable form, which has been divided by authors 

 into numerous species and varieties, the chief objection to whu-h is 

 the extreme difficulty of distinguishing them, even with the aid of 

 good figures. 



The Marchesa Paulucci has made a critical study of the group 

 (Bull. Soc. Mai. Ital., viii) and, except in considering //o.<y^V////x. 

 carce, etc., subspecies instead of species, I have not departed from her 

 arrangement of the forms. 



Var. ISILENSIS (Villa) Mabille. PI. 63, figs. 29-., 1. 



A pallid depressed form which is considered bv the Marchesi 

 Paulucci to be a variety or local race of the If. serp'-iifimt, the prin- 

 cipal character of which is the total want of color. There are al>o 

 individuals with dark dots or spots. Diam. 20-21, alt, 10-11 mill. 



Corsica. 



Var. JASPIDKA Moq.-Tand. PI. 61, figs. 20-21'. 



Larger, bands not distinct above, marbled ; colors bright 



Cornea, 



Var. ISAR^E Paulucci. PL 61, figs. 23-25. 



Shell more rugose than the type, the interrupted zon^ paler ; no 

 umbilical or parietal macula; columellar margin brown-punctate. 



Diam. 20, alt. 12 mill. 



Subspecies HOSPITANS Bonelli. PL 54, figs. 22, 23. 



A form differing in its rather larger more globose form from tin- 

 typical serperima. '< The coloration varies from a whit ^ g 

 all covered with dots of dark or pale brown disposed in aen 

 interrupted zones, to a milk-white, without trace of markn, 

 spot which ornaments the base at the insertion of the oolumel 

 however, always remains constant, but even this is subject 

 mutation as well in the intensity of its color as in the 

 the form, the modifications are still more obvious; tor. wh.l, 



