CANARIAN GROUP. 345 



Helix Adansoni, Pfeiff., Mon. Hel. i. 268 (1848) 



Pouchet, Mouss., Faun. Mai. des. Can. 82 (1872) 

 Adansoni, Pfeiff., Mon. Hel. vii. 345 (1876) 



Habitat Teneriffam; in aridis apricis juxta Sta. Cruz et 

 Orotava degens. Necnon etiam semifossilis occurrit. 



The H. Pouchet is a strictly Teneriffan species ; and I have 

 little doubt that the additional habitat ' Grand Canary,' which 

 was cited for it by Webb and Berthelot, was founded either on 

 an inaccuracy of identification or else (which is far more pro- 

 bable) on their characteristic looseness, as regards data. Like 

 the H. plicaria, it has been taken by almost every naturalist 

 who has visited Teneriffe for many years past, including Webb 

 and Berthelot, d'Orbigny, Blauner, Hartung, Fritsch, Eeiss, 

 Lowe, Watson, and myself, and, I believe, in nearly all instances, 

 on the sides of the Barranco del Passo Alto near Sta. Cruz. I 

 have however met with it, likewise, on the opposite side of the 

 island, near the Puerto of Orotava, where it occurs equally in 

 a subfossilized, or partially subfossilized, condition. 



Helix desculpta. 



Helix desculpta, Mouss., Faun. Mai. des Can. 83 (1872) 

 Pfei/., Mon. Hel. vii. 345 (1876) 



Habitat Fuerteventuram, semifossilis ; a cl. Fritsch lecta. 



This species appears to have been described by Mousson 

 from a subfossil example, or examples, found by Fritsch in 

 Fuerteventura ; and, judging from the diagnosis (for I have not 

 been able to procure a type for examination), I might have 

 been inclined to regard it as not very remote from the H. Pou- 

 chet, were it not expressly said to be free from granulations and 

 to have no traces of even an obsolete keel on its basal volution, 

 which latter, moreover, is less abruptly deflexed at the aper- 

 ture. It seems to be allied both to the H. Pouchet and the H. 

 plicaria, though not referable to either. 'Cette espece,' says 

 Mousson, * d'une epoque ancienne, ne rentre bien ni dans les 

 formes de YH. plicaria, ni de YH. Pouchet. Elle est plus glo- 

 buleuse ; le dernier tour n'a pas trace d'angulation ; la sculpture 

 consiste en simples stries, non serrees, peu relevees, et parfaite- 

 ment lisses, tandis qui dans la premiere des deux autres especes 

 elles sont incisees, dans la second granuleuses ; 1'ouverture est 

 plus contracted, plus petite, moins evasee en haut et pourvue d'un 

 bord aussi largement reflechi que dans les autres especes.' 



Helix retrodens. 



Helix retrodens, Mouss., Faun. Mai. des Can. 89. p. 4. 

 f. 14,15(1872) 



