HELIX. 131 



H. GIBBOSO-BASALIS Wollaston. ( 'n figured. 



Similar to H. lactea, but smaller, nearly concolored, dark brown, 

 without white points or flecks; spire obtuse; whorls 4, not much 

 deflexed at aperture; basal margin of peristome with a distinct 

 tooth. Diam. 24 mill. 



Northern part of Ins. Teneriffe, Canaries. 



H. ATAVORUM Mabille. PI. 40, fig. 11. 



Imperforate, subgiobose, solid, thick, destitute of cuticle, roughly 

 obliquely rnalleate, and costulately striate, grayish brown, obscurely 

 five-fasciate ; spire conoidal, prominent; apex minute, obtuse, slightly 

 striate, shining; whorls 6, slightly convex, very rapidly increasing, 

 the last large, globose, subangulate in front of the aperture, becoming 

 rotund-turgid, and somewhat descending at termination of whorl; 

 aperture oblique, rotund lunate, peristome thick, narrowly reflected, 

 appressed at base, regularly curved, terminations distant, connected 

 by a thin callus ; base thickened inside with a subtriangular denti- 

 form callus. Diam. 31 mill. Grand Canary Id. (fossil.) 



H. AHMAEINA (Bourg.) Mabille. PI. 40, fig. 13. 



Imperforate, depressed globose, solid, thick, shining, not transpa- 

 rent, with undulating interrupted spiral lines and incremental stride; 

 color greyish, strewn with white dots and flecks, and encircled with 

 four dark bands; spire conic, slightly elevated, acute at the corneous 

 or pinkish apex ; whorls over 5, the last large, rounded, abruptly 

 descending anteriorly; aperture oblique, oval-elongate, maroon 

 colored inside. Diam. 29-34 mill. 



Ins. Grand Canary. 



H. PUNCTATA Miiller. PI. 39, figs. 99-100. 



Imperforate, depressed globose, solid, with minute revolving lines 

 and incremental strias, color dirty white, four or five banded with 

 brown or rufous, bands generally indistinct, clouded, or coalescent, 

 rarely wanting, strewn with white points and flecks ; spire depressed 

 conic ; whorls 5, slightly convex, more or less rapidly increasing, 

 the last large, inflated, decidedly deflexed anteriorly ; aperture ob- 

 lique, widely semioval, blackish or brown within ; peristome broadly 

 expanded, reflexed, appressed and thickened within at base, black, 

 the extremities approaching, connected by a dark callus. 



Diam. 30-45 mill. 



Spain ; Northern Africa ; Canary and Balearic Is ; inirodueed 

 into Cuba and other Spanish colonies. 



