MADEIRAN GROUP. 105 



Eeadily known from all the varieties of the H. erubescens 

 (which in size, contour, and sculpture it much resembles) by its 

 uniformly rich, deep, brownish-yellow, or yellowish-brown, hue, 

 its rather stronger substance and more shining surface, and by 

 its volutions having a narrow, dark, interrupted, or disjointed, 

 tesselated fascia at their base (very conspicuous on the ultimate 

 one, — where it is just above, and immediately adjoining, the in- 

 distinct keel), and generally faint traces of a very obsolete and 

 paler (but equally fragmentary) one, often altogether absent, on 

 their anterior edge (fringing the suture). The peristome, like- 

 wise, is a little less developed and reflexed than in the H. eru- 

 bescens ; the basal whorl descends somewhat more abruptly in 

 front ; the keel is, if anything, a trifle more expressed ; and the 

 surface is perhaps, on the average, less malleated but more per- 

 ceptibly striate. 



The //. furva (which is found also in a subfossil condition, 

 though very rarely, at Canipal) is widely spread over the inter- 

 mediate and lofty regions of Madeira proper, to which island it 

 would seem to be peculiar. On the mountains above Funchal it 

 is at times comparatively abundant, — particularly in the chestnut- 

 woods at the Mount, towards the Pico d'Arribentao, at the Pico 

 do Infante, and on the southern slopes of the Pico da Silva ; 

 and it was met with by Mr. Lowe and myself at the extreme 

 head of the Eibeira do Inferno (on the Paul de Serra), in the 

 north-west of the island. 



Helix erubescens. 



Helix erubescens, Lotue, Cambr. Phil. S. Trans, iv. 40. t. 5. 

 f. 3 (1831) 

 „ „ et simia, Pfeif., Mon. Hel. i. 270 et 288 



(1848) 

 „ „ Lowe, Proc. Zool. Sac. Lond. 165 (1854) 



„ „ A lb., Mai. Mad. 47. 1. 1 2. f. 11-1 6 ( 1854) 



„ „ Paiva, Mon. Moll. Mad. 13 (1867) 



var. porto-sancti, Woll. 



Helix fluctuosa, var. a., Paiva, I. c. [vide Ohs. p. 14] (1867) 

 var. advenoides, Paiva. 



Helix advena, Loiue [nee W. et B.], Proc. Zool. Soc. Lond. 

 165 [yid. Obs. 2] (1854) 

 „ erubescens, var. 7, advenoides, Paiva, I. c. 14 (1867) 

 var. hycena, Lowe. 



Helix hyaena, Loiue, Ann. Nat. Hist. ix. (1852) 

 „ „ Pfeiff., Mon. Hel. iii. 200 (1853) 

 „ erubescens, var. h., Lowe, Proc. Zool. Soc. Lond. 165 



(1854) 



