HELIX. 179 



densely-packed, coarse, subconfluent oblique ridges, or subundulating 

 vermiform folds; and in color it would seem to be of a dingy oliva- 

 ceous-white, suffused with a darker tint in consequence of the four or 

 five obsolete bands which are indistinctly indicated." 



Mabille considers this form a variety or monstrosity of H. planor- 

 bella. 



H. AMBLASMODON Mabille, 1883. PI. 48, figs. 17, 18. 



Imperforate, depressed-orbicular-convex, thick, solid, scarcely 

 shining, yellowish fulvous, with four dark black-spotted bands, 

 irregularly costulate-striate, here and there, especially below, with 

 dectirrent lines, under the lens all over finely granulate ; whorls 5, 

 very rapidly increasing, separated by rather deep suture ; body- 

 whorl large, compressed-rotund, rapidly descending and slightly 

 gibbous at aperture, scarcely gibbous at aperture, scarcely constric- 

 ted ; aperture oblique, lunate, irregularly oblong, peristome thick, 

 reflexed, acute, violaceous, margins subapproximating, joined by a 

 very thin violet callus, basal margin straightened, lengthily adnate, 

 with a strong impressed umbilical callus, tortuous columella, and a 

 white, saliant, tortuous lamina inside. Diam. 26, alt. 13 mill. 



Ins. Grand Canary. 



Resembles Macularia balearica somewhat in the maculated bands. 



H. ZORGIA Mabille, 1883. PI. 49, figs. 27-29. 



Imperforate, solid, depressed-orbicular-subglobose, slightly trans- 

 parent, yellowish, with four brown bands, interrupted with yellow, 

 irregularly costulate-striate, under the lens finely granulate and 

 very superficially malleate ; spire depressed-convex, apex minute, 

 rugose, rufous ; whorls 5-5-1, rapidly increasing, separated by linear, 

 obscurely margined sutures; body-whorl slightly angled at its origin, 

 becoming rotund, a little turgid at the aperture, lightly constricted, 

 subabruptly, rapidly descending ; aperture oblique, lunate, oblong- 

 rhomboid, margins subapproximating; peristome violet-tinted, 

 subthickened, reflexed, obtuse, basal margin straightened, adnate, 

 with a prominent white lamina inside, and a wide impressed callus 

 over the umbilical tract. Diam. 24, alt. 12 2 mill. 



Ins. Grand Canary. 



The more prominent characters are the very solid shell, yellow 

 ground color, with wide, frequently interrupted, reddish-brown 

 bands, the thick violet colored peristome, and strong basal tooth. 



