HELIX. 



H. HARMONICA Mousson, 1872. PI. 61, fig. 11. 



Imperforate, subglobose-depressed, rather solid, widely costulate- 

 striate, very minutely and indistinctly elongate-granulate, yellowish 

 whitish, deeper colored above, bifasciate with pale brown below ~ 

 spire obtuse, somewhat convex, nucleus flattened, minutely granu- 

 late, corneous; suture slightly impressed narrowly margined with 

 white; whorls 4j-5, the last depressed rotund, a little descending, 

 subinflated below; aperture very oblique, showing the bands within, 

 lunate wide-oval; peristome obtuse, white, shortly reflexed, the 

 margins a little converging, the basal less curved than the upper,, 

 appressed to the base. Diam, 22, alt. 14 mill. 



Ins. Hierro, Canaries. 



H. GOMERENSIS Morelet, 1864. PL 61, figs. 3, 4. 



Covered perforate, depressed, thin, subtranslucent, corneous brown,, 

 with three dark bands, one near the suture, one above, the other 

 below the periphery; spire depressed conic, obtuse; suture well 

 marked ; whorls 4, apex planulate, nearly smooth, whorls gradually 

 increasing except the last, which widens very rapidly, especially 

 toward the aperture; sculpture of very minute granules all over, 

 and fine irregular oblique stria?; body-whorl angular at its origin,, 

 becoming rounded and somewhat tumid below toward the aperture,, 

 gradually descending anteriorly; aperture very oblique, large, trans- 

 versely oval, slightly lunate; peristome thin, acute, its margins 

 converging, the upper and lower equally arched, columella scarcely 

 thickened within, rounded, reflexed and adnate on base, with a 

 white callus over the indented umbilical region. 



Diam. 21, alt. 12 mill. 



Ins. Gomera, Canaries., 



H. THORYNA Mabille, 1882. PI. 46, figs. 66, 67. 



Imperforate, convexo-depressed, subfragile, thin, subopaque, not 

 shining, greenish tinged with rufous, with three faint bands of the 

 same color; spire convex, apex yellowish, obtuse, punctulate, whorls 

 5, flatly sloping, subregularly increasing, suture distinct, body-whorl 

 large, subacutely carinated, rounded toward the aperture, the carina 

 evanescent, and a little gibbous, very slightly constricted; aperture- 

 oblique, lunate, oblong-rotund; peristome subthickened within, acute,, 

 expanded, the margins converging, outer margin sinuous, well curved, 



