IIKLIX. 215 



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

 ter, anteriorly slightly deflexed ; aperture broadly semioval, oblique, 

 whitish within, not showing the bands prominently ; pcristome nar- 

 rowly expanded, slightly albolabinte, its upper and lower niar^in- 

 subparallel, not converging ; columellar margin reflexed, appressed 

 over the axis, dark colored, especially toward the umbilical callus ; 

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



Southern France ; Italy ; Corsica ; Sardinia. 



An excessively mutable form, which has been divided by authors 

 into numerous species and varieties, the chief objection to which 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 hospitans, 

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

 arrangement of the forms. 



Var. ISILENSIS (Villa) Mabille. PL 63, figs. 29-31. 



A pallid depressed form which is considered by the Marchesa 

 Paulucci to be a variety or local race of the H. serpentina, the prin- 

 cipal character of which is the total want of color. There are also 

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



Sardinia ; Corsica. 



Var. JASPIDEA Moq.-Tand. PL 61, figs. 20-22. 



Larger, bands not distinct above, marbled ; colors bright. 



Bonafacio, Corsica. 



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



Shell more rugose than the type, the interrupted zones paler ; no 

 umbilical or parietal macula; columellar margin brown-punctate. 



Diam. 20, alt. 12 mill. Sardinia. 



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



A form differing in its rather larger more globose form from the 

 typical serpentina. " The coloration varies from a whitish ground, 

 all covered with dots of dark or pale brown disposed in series like 

 interrupted zones, to a milk-white, without trace of markings. The 

 spot which ornaments the base at the insertion of the columella, 

 however, always remains constant, but even this is subject to great 

 mutation as well in the intensity of its color as in the size. As for 

 the form, the modifications are still more obvious ; for, whilst the 



