CANADIAN GROUP. 345 



Helix Adansoni, Pfeiff., Mmi. Ed. i. 268 (1848) 



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

 „ Adansoni, Pfeif., Mon. Eel. vii. 345 (1876) 



Eahitat Teneriffam ; in aridis apricis juxta Sta. Cruz et 

 Orotava degens. Xecnon etiam semifossilis occurrit. 



The E. Pouchet is a strictly Tenerififan 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 E. plicaria, it has been taken by almost every naturalist 

 who has visited Teneriflfe for many years past, — including Webb 

 and Berthelot, d'Orbigny, Blauner, Hartimg, 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 occiu-s equally in 

 a subfossilized, or partially subfossilized, condition. 



Helix desculpta. 

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

 „ „ Pfeiff., Mon. Eel. vii. 345 (1876) 



Eahitat 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 t^-pe for examination). I might have 

 been inclined to regard it as not very remote from the E. 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 E. Pouchet and the E. 

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

 Mousson, ' d'luie epoque ancienne, ne rentre bien ni dans le^ 

 formes de IE. plicaria, ni de 1'^. Pouchet. Elle est plus glo- 

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

 consiste en simples stries, non sen-ees, peu relevees, et parfaite- 

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

 elles sont ineisees, dans la second gTanuleuses : rouvertiu-e est 

 plus contract ee, plus petite, moins evasee en haut et poiuvne d"im 

 bord aussi largement reflechi que dans les autres especes.' 



Helix retrodens. 



Helix retrodens, Mov^ss., Faun. Mai. des Can. 89. p. 4. 

 f. 14, 15 (1872) 



