HELIX. 27 



bercles above the peripheral carina, base slightly convex ; peristome 



simple, acute. Diam. 7'5 mill. 



Canary Is. 



Has been referred, as a synonym, to the next species, but its dif- 

 ferential characters are obvious. 



H. PUMILIO, Chemn. PI. 6, figs. 49, 50. 



Narrowly umbiHcated, whitish, muricately rugose ; whorls 7, all 

 acutely cariuated, last whorl bicarinated, the peripheral cariua ser- 

 rated, base rugosely striate. Diam. 10 mill. 



Near Mogador, Morocco. 



H. TROCHOIDES, Poiret. PL 5, figs. 28-31 ; PI. (5, figs. 36-39. 



Perforate, substriate, whitish, unicolored or chestnut banded ; 

 whorls 5-6, slightly convex, with thread-like carina, base a little 

 convex ; peristome acute, labiate within. Diam. 6'67 mill. 



Mediterranean ( 'ountries. 



It is H. conica, Drap., H. Algira, Chier., H. solarium, Risso. 



Var. SULCULATA, Jan. Figs. 30, 31. 



Carina obsolete, costulate-striate, usually maculated with chestnut, 



whorls scarcely convex. 



Sicily, Malta, Italy, etc. 



H. rugosiuscula, Mich., and H. rugosa, Arad., are synonyms. 



Var. PUMILIO, Pfr. 



Umbilicus wider, costulate-striate, carina crenulated. 



Var. PYRAMIDELLA, Jan. 



Trochiform, umbilicated, striate, obtusely carinated, white, with 



diaphanous corneous maculations. 



Northern Italy. 

 Var. TURRITELLA, Parr. Figs. 36, 37. 



Perforate, striate, with a brown band above the carina and usually 

 another on the base, suture distinctly thread-margined ; whorls 62, 



convex, the last with subacute thread-like carina, 



Dalmatia. 

 Var. REMISSA, Parr. 



Shell smaller, whorls 6, with oblong maculations and brown striae 



above. Diam. 4 mill. 



Ins. Lesina. 

 'Var. VERTICILLATA, Parr. Figs. 38, 39. 



Perforate, conical, closely plicate, white, suture margined ; whorls 

 6, slightly convex, peripheral carina defined by a sulcus. 



Diam. 5 mill. 



Ins. Ehodes; Italy. 



