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 lam'ellose 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, puuctulate; 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 subdeutate 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 

 bauds 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- 



