360 TEST ACE A ATLANTIC A. 



The H. invernicata, which is strictly Teneriffan (unless in- 

 deed the H. Ouanartertxes be regarded as the Grrand-Canarian 

 modification of the consohrina, — in which case the three forms 

 would probably be referred to a single plastic type, having for 

 its range the intermediate districts of Grand Canary and Tene- 

 riffe), was originally discovered by Webb within the hollow 

 trunks of old laurels and heaths in the little wood of La Espe- 

 ranza, a few miles to the south of Laguna ; and I may add that 

 it was met with by Mr. Lowe and myself, under precisely similar 

 circumstances, in the same spot. Whether the other naturalists 

 who have obtained it (namely Mange, d'Orbigny, Zollinger, 

 Fritsch, and Eeiss) found it also at La Esperanza, I have no 

 means of ascertaining. 



Helix malleata. 



Helix malleata, Fer., Prodr. 91 (1821) 

 „ bidentalis. Lam., Hist vi. 279 (1822) 

 „ malleata, W. et B., Ann. des 8c. Nat. 28. syn. 312 



(1833) 

 „ „ dVrb., in W. et B. Hist. 54. t. 1. f. 15-17 



(1839) 

 „ „ Pfeiff., Mon. Hel. i. 312 (1848) 



„ „ Mouss., Faun. Mai. des Can. 91 (1872) 



Habitat Teneriff am. ; in sylvaticis intermediis editioribusque, 

 inter muscos humidos, ad truncos arborum cavernosos, et sub lapi- 

 dibus, hinc inde vulgaris. 



Peculiar apparently to the sylvan regions of Teneriffe, at 

 intermediate and rather lofty altitudes, particularly in the 

 north-eastern division of the island. It was taken by Mr. Lowe 

 and myself at the Agua (rarcia, as well as at Las Mercedes, at 

 the edges of the Vueltas above Taganana, and between Taga- 

 nana and the Valle de Palmas (near Point Anaga) ; and it has 

 been met with in Teneriffe by nearly every naturalist who has 

 visited that island, — including Webb and Berthelot, Mauge, 

 d'Orbigny, Blauner, Fritsch, and Eeiss. 



The H. malleata (which measures about 11-^ lines across the 

 widest part, with an altitude of about 9) is a strong and globose 

 shell, at once distinguishable by its glossy, malleated surface, 

 its dark rich olivaceous-brown hue (rendered darker by the 

 broad, though not always apparent, coffee-coloured bands with 

 which it is ornamented and suffused), by its suddenly and very 

 greatly deflexed (posteriorly constricted) aperture, and by its 

 peristome (which is thickened into a coarse and prominent 

 white rib, rather than reflexed) being developed internally into 

 two tooth-like callosities, — one of which is extremely large and 

 placed at the angle, or, insertion, of the upper margin, whilst 



