146 TEST ACE A ATLANTIC A. 



specimen (in the collection of Mr. Leacock), considerably reduced 

 in stature, which was met with, in 1858, by Mr. Rice. By 

 Senhor J. M. Moniz it was also found in the north of the island, 

 namely in the Eibeira de Sao Jorge. 



(§ Hisjndella, Lowe.) 



Helix Armitageana. 

 Helix Armitageana, Lowe^ Ann. Nat. Hist. ix. (1852) 

 „ „ Pfeif., Mon. Hel. in. 122 (1853) 



„ „ Lowe, Proc. Zool. Soc. Loud. 179 



(1854) 

 „ „ Alb., Mai. Mad. 19. t. 2. f. 2s-31 



(1854) 

 „ „ Paiva, Mon. Moll. Mad. 27 (1867) 



Habitat Maderam ; sub lapidibus in graminosis, regiones 

 valde excelsas colens. Usque ad 6,000' s.m. ascendit. 



This is a species which seems to be peculiar to the highest 

 elevations of Madeira proper, where it is decidedly both rare 

 and local, — having been detected by myself and the late Eev. 

 W. J. Armitage, in January 1849, near the Ice House Peak 

 and the Pico dos Arrieros, at an altitude of about 5,500 feet 

 above the sea ; though a single young and (but for these later 

 ones) indeterminable example had been taken by Mr. Lowe, so 

 far back as March of 1827, on the slopes of the Pico Euivo. 



The H. Armitageana (which measures about 3 lines across 

 its broadest part) is extremely thin and brittle in its substance, 

 and semi-transparent, and (like the H. pavida at the Cana- 

 ries) it often coats itself over with an outer envelope of dirt ; its 

 umbilicus, although not large, is distinct and cylindrical ; its 

 peristome, although acute, is rather expanded and developed ; 

 and its surface, which is asperated all over (when the specimens 

 are fresh and unrubbed) with elongate-triangular file-like squa- 

 miform filaments (rather than hairs), is of a greenish- or 

 olivaceo-corneous hue, and there are generally obscure indica- 

 tions (at any rate on the basal whorl) of two narrow indistinct 

 (sometimes obsolete) browner bands. 



We may regard the H. Armitageana as the Madeiran repre- 

 sentative of the H. pavida, Mouss., of Teneriffe and Palma, — 

 with which, in its general features and mode of life, it has a 

 good deal in common. The Canarian shell, however, although 

 equally fragile and (when freed from its covering of dirt) sub- 

 pellucid, is smaller and altogether more insignificant, its spire 

 is more depressed, its umbilicus is relatively larger, its peristome 

 is less developed, its surface is minutely frosted with very short 

 infinitesimal lacinii^-like bristles, and (in lieu of the two iudis- 



