170 HELIX. 



H. GLYCEIA Mabille, 1882. PI. 47, fig. 78. 



Imperforate, subglobose-depressed, thick, irregularly striate some- 

 times obscurely granulate; spire obtuse conic, apex mamillated 

 smooth; whorls 5, depresso-convex, sensibly increasing, separated 

 by linear sutures, the last large, angulate-rotund, abruptly, shortly 

 deflexed and obliquely dilated at the aperture, turgid below; aper- 

 ture oblique, lunate, irregularly subquadrate ; peristome thick, 

 revolute, thickened within and without, margins not approaching, 

 joined by a thin callus, outer margin angularly curved, middle 

 tuberculate, the columellar margin longly appressed, thick, callous 

 at its insertion, and provided with a long lamellose tooth inside. 



Diam. 26-30, alt. 15 mill. 



Quaternary of Ins. Teneriffe, near the lighthouse of Anaga. 



H. EMPEDA Mabille, 1883. PL 47, fig. 81. 



Imperforate, opaque, striate-costulate; spire conic, apex mamillate, 

 obtuse, punctulate; whorls 5, convexly sloping, regularly, rapidly 

 increasing, separated by impressed sutures; body- whorl large, ro- 

 tund-inflated, obscurely angular at the periphery, at aperture com- 

 presso-declivous, slightly constricted, rapidly descending, turgid 

 below; aperture very oblique, lunate, irregularly rounded; margins 

 distant, peristome thick, somewhat reflexed, labiate within, external 

 margin obliquely subdentate in the middle, angularly curved, base 

 arcuate, slightly excavated, feebly dentate ; columella short, cover- 

 ing the umbilicus with a strong callus. Diam. 25, alt. 16 mill. 



Quaternary of Ins. Grand, Canary. 



Allied to H. glasiana and H. fritschi; from the former its greater 

 size, the elevation of its conical spire, and the thicker, more oblique 

 peristome distinguish it ; from the latter, the curved base (straight 

 in H. fritschi), and different armature of same, separate the present 

 species. 



H. FRITSCHI Mousson, 1872. PL 50, fig. 91. 



Imperforate, globose or subdepressed globose, densely minutely 

 costulate-striate, the costulse subundulating, subgranulate, base 

 smoother; grayish green, paler beneath, with four violet-brown, 

 bands and scattered elongated small white spots; spire obtusely 

 convex, apex flattened, corneous, rapidly increasing, minutely 

 granulate-rugose; suture lightly impressed, subirregular ; whorls 4, 

 the last large, rounded, rapidly descending, slightly subinflated and 

 subconstricted, below somewhat tumid ; aperture oblique, rounded- 



