MADEIRAN GROUP. 105 



Readily 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 H. 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, Lowe, Cambr. Phil. S. Trans, iv. 40. t. 5. 



f. 3 (1831) 

 et simia, Pfeiff., Mon. Hel. i. 270 et 288 



(1848) 



Lowe, Proc. Zool. Soc. Lond. 165 (1854) 



Alb., Mai. Mad. 47. 1. 12. f. 11-16 (1854) 



Paiva, Mon. Moll. Mad. 13 (1867) 



var. porto-sancti, Woll. 



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

 var. advenoides, Paiva. 



Helix advena, Lowe [nee W. et B,~|, Proc. Zool. Soc. Lond. 



165 [vid. Obs. 2] (1854) 



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

 var. hycena, Lowe. 



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

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

 erubescens, var. ., Lowe, Proc. Zool. Soc. Lond. 1 65 



(1854) 



