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 Canical) 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 Ribeira 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. t. 12. f. 11-16 (1854) 



„ „ Paiva, Mon. Moll. Mad. 13 (1867) 



var. porto-sancti, Woll. 



Helix fiuctuosa, var. a., Paiva,l. c. [vide Obs. p. 14] (1867) 

 var. advenoides, Paiva. 



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

 165 [yid. Obs. 2] (1854) 

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

 var. hyaina, Lowe. 



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

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

 „ erubescens, var. 8., Lowe, Proc. Zool. Soc. Lond. 165 



(1854) 



