HELIX. 155 



origin, becoming rotund compressed, below obliquely compressed, a 

 little descending at aperture ; aperture oblique, lunate, small, ovate 

 or ovate-triangular; peristome subthickened, reflexed, 'acute, basal 

 margin armed with a thin lamina. Diam. 21, alt. 11 mill. 



Ins. Grand Canary. 



This species, found only in a fossil state, is separated from its 

 allies by the lesser development of the last whorl, the large, obtuse 

 apex, smaller aperture, thin peristome, and decided compression of 

 the base. 



H. EPHEDROPHILA Mabille, 1883. PI. 48, figs. 21, 22. 



Imperforate, depressed-convex, thick, solid, opaque, scarcely shin- 

 ing, distinctly costulate-striate, obscurely submalleate, under the 

 lens minutely granulate ; spire convex, apex minute, punctate, obtuse, 

 shining, reddish ; whorls 5-51, regularly, rapidly increasing, sutures 

 linear but distinct; body-whorl large, compressed-rotund, descending 

 briefly and suddenly at the aperture, slightly constricted, not gib- 

 bous; aperture small, oblique, lunate, oblong-subrhomboidal, mar- 

 gins subconverging, joined by a thin livid callus; peristome thickened, 

 reflexed, outer margin subnodulous, excavated, curved, appearing 

 sinuous, basal margin lengthily appressed, callous, with an internal 

 dentiform, short, tortuous lamina, columella short, tortuous, ap- 

 pressed over the umbilicus. Diam. 21, alt. 11 mill. 



Ins. Grand Canary. 

 H. THEMERA Mabille, 1883. PI. 49, fig. 38. 



Imperforate, depressed-subglobose, solid, a little shining, and 

 ornamented, under a yellowish, transparent, very evanescent cuticle, 

 with striae and irregular malleations, especially upon the last whorl; 

 color brown, five fasciate ; spire small, convex, apex subacute, ob- 

 scurely rugose, purplish; whorls 5-5 2, rapidly increasing, separated 

 by impressed sutures ; body-whorl large, compressed-rounded, a little 

 dilated and strongly descending anteriorly ; aperture oblique, lunate, 

 oblong-subquadrate, margins subapproximating; peristome thick- 

 ened, labiate within, reflexed, outer margin sinuately arcuate, basal 

 margin straightened, thickened, armed with a long denticle, lengthily 

 adnate on the base, appressed at the insertion over the umbilicus. 



Diam. 13, alt. 8 mill. 



Barranco Angostura, Ins. Grand Canary. 



H. RIPROCHI Mabille, 1882. PL 48, figs. 7, 8. 



Imperforate, slightly convex-orbiculate, striate, decussate, espe- 

 cially around the suture of last whorl, finely, regularly marked 



