HELIX. 145 



H. PR^DISPOSITA Mousson. PI. 39, figs. 4, 5. 



Imperforate, depressed, transversely striate, with decussating lines, 

 whitish, with four bands, the upper narrow, the second wide, inter- 

 rupted with white ; spire depressed conic, with large obtuse nucleus ; 

 whorls 4 to 5, rapidly increasing, slightly convex, the last dilate. 1, 

 strongly deflexed anteriorly; aperture very oblique, transversal v 

 ovate ; peristome narrowly expanded, margins approaching, con- 

 nected by a light callus ; basal margin subhorizontal, wide, adnate. 



Diam. 29 mill. 



Reraya Valley, Morocco (subf ossify. 



H. RERAYANA Mousson. PL 37, figs. 63-65. 



Imperforate, depressed, irregularly obliquely striate and with 

 transverse short irregular wrinkles; color dirty white, with flam- 

 mules and flecks of brownish, indistinctly two to five banded; spire 

 slightly convex, apex smooth ; whorls 5, rapidly increasing, the 

 last widened toward the aperture and abruptly descending ; aperture 

 very oblique, transversely oblong; peristome slightly expanded, 

 acute, slightly thickened 'within, Diam. 37-41 mill. 



Reraya Valley, Morocco. 



H. MOUSSONIANA Wollaston. PL 43, fig. 76. 



Large, imperforate, globose-depressed, subinflated, rather thin, 

 strongly striate, not granulate nor malleate, lacking epidermis ; 

 spire rapidly increasing, apex smooth, obtuse ; sutures irregularly 

 impressed ; whorls nearly 5, the last deflexed suddenly at aperture, 

 convex and turgid below; aperture oblique, transverse, perfectly 

 elliptical ; peristome narrowly reflected, adnate below, its ends joined 

 by a callus ; columella excavated. Diam. 37 mill. 



Ins. Gomera, Canaries (f ossify. 



It is H. adonis Mousson, not Angas. It is closely allied to the 

 following species and to H. alonensis. 

 H. EFFERATA Mousson. PL 43, fig, 77. 



Globosely depressed, subsolid, striate and with obtuse undulating 

 rugose inalleations, not granulate; whorls 4J, less convex ami di- 

 lated than in H. moussoniana, obtusely angulate. Diam. 31 null. 



Ins. Gomera, Canaries (fossil) 



The pattern of sculpture, obscure undulations obliquely crossing 

 the strise is characteristic. 



Both this and the preceding species may prove 1 



Hemicycla. 

 10 



