168 HELIX. 



defined darker bands, four or five in number ; spire depressed convex- 

 conic, apex rather obtuse, obsoletely granulate; whorls 4?, coarsely 

 obliquely, irregularly striate, the last rudely, obviously malleate, at 

 its origin angulate, its last third rounded, inflated, widened in the 

 immediate vicinity of the aperture, then constricted, gibbous below, 

 deeply deflexed anteriorly; aperture very oblique, rounded trigonal; 

 peristome broadly reflected, pinkish gray, labiate with darker, its 

 ends converging and joined by a scarcely perceptible callus; upper 

 margin well arched, subangular in the middle ; lower margin straight, 

 adnate, with a thick white lamella within, and joining the outer lip 

 at an angle. Diarn. 19, alt. 12 mill. 



Ins. Teneriffe, Canaries. 



If. paivana Lowe is a synonym. 



May be separated from H. pouchet and other allies by the rude 

 malleation, and the lack of spiral impressed lines. 



H. IDIOTBYPA Mabille, 1883. PL 48, figs. 12, 13. 



Imperforate, convex, depressed subglobose, solid, opaque, scarcely 

 shining, uniform whitish green, irregularly malleate and rugose, 

 plicate-striate ; spire convex, apex rugose, obtuse, decorticated, 

 unicolored ; whorls 5, first 3 flat, slowly increasing, the remainder a 

 little convex, rapidly widening, separated by linear suture, impressed 

 on last whorl; body-whorl large, subacutely angled, becoming 

 turgidly rounded toward the aperture, obliquely subdilated, scarcely 

 constricted, abruptly descending, flattened and shining below ; 

 aperture oblique, lunate, subquadrate-oval ; peristome a little 

 thickened, white-labiate within, acute, flatly expanded, margins 

 subcouverging, the columellar straightened, excavated, adnate. 



Diam. 20, alt. 9J mill. 



Ins. Teneriffe, Canaries. 



H. MALLEATA Ferussac, 1821. PI. 49, figs. 42, 44. 



Imperforate, globosely-depressed, somewhat dilated transversely, 

 strong and solid, olivaceous brown, base lighter, generally with five 

 dark spiral bands, the second and third coalescent, the lower one 

 narrow and faint ; spire somewhat conic, obtuse ; suture moderately 

 marked ; whorls 4}, regularly increasing, the first one or two reddish, 

 apparently nearly smooth, but finely granulate under the lens, the 

 balance irregularly obliquely striate, microscopically granulate, 

 rather finely and very regularly malleate ; body-whorl angular at 

 its origin, but rounded and with very gibbous base on its last third, 



