446 TEST ACE A ATLANTIC A. 



Bulimus decollatus, Lowe, Cambr. Phil. Soc. Trans, iv. 62 



(1831) 

 Alb., Mai. Mad. 54. t. 14. f. 16, 17 



(1854) 



Morel., Hist. Nat. des Acor. 196 (1860) 



Stenogyra decollata, Mouss., Faun. Mai. des Can. 120 



(1872) 

 Bulimus decollatus. Morel., Journ. de Conch, xiii. 238 



(1873) 

 Watson, ibid. 222 (1876) 



Habitat Lanzarotam, Fuerteventuram, Canariam Grandem, 

 Teneriffam, et Gomeram ; in aridis apricis, prsecipue maritimis 

 et prsecipue (sed non solum) inferioribus, degens. Etiam semi- 

 fossilis in Lanzarota et Canaria Grandi parce occurrit. 



This widely distributed Mediterranean Stenogyra (which exists 

 also in the Azores, Madeiras, and Cape Verdes) will probably be 

 ascertained, sooner or later, to be quite universal at the Canaries, 

 though I am not aware that it has been observed hitherto either 

 in Palma or Hierro ; but in the other five islands of the archi- 

 pelago namely Lanzarote, Fuerteventura, Grand Canary, Tene- 

 riffe, and Gomera I have myself met with it ; and it is recorded 

 likewise from Graciosa (off the extreme north of Lanzarote), as 

 well as from Lobos, off the north of Fuerteventura. It is more 

 particularly to be found in arid spots of a low elevation, towards 

 the coast ; nevertheless this is by no means invariably the case, 

 for when in Fuerteventura I obtained it around Sta. Maria 

 Betancuria as well as on the Monte Atalaya. 



Mr. Watson, in referring to the widely acquired range of 

 this Stenogyra, says (Journ. de Conch. 222 ; 1876) that it has 

 been ' recently introduced into the Canaries ; ' but I scarcely 

 think that there is sufficient evidence to warrant a positive 

 assertion to that effect. So far as my own experience is con- 

 cerned, I should say that it has a greater appearance at the 

 Canaries of being aboriginal than it has in any of the other 

 Groups ; indeed near Arrecife in Lanzarote, as well as near Las 

 Palmas in Grand Canary, I met with it in a condition which is 

 thoroughly and unmistakeably subfossilized, which certainly 

 would not have been the case if the species had but lately been 

 naturalized in the archipelago. Perhaps it is, however, that the 

 latitude of the Canaries appears too southern to enter within its 

 supposed geographical province ; but, be this as it may, that 

 cannot alter the fact to which I have just called attention, to 

 say nothing of the discovery of the species by M. de Cessac at 

 the Cape Verdes, which is nearly a thousand miles still further 

 to the south. 1 



1 Although I think that it can hardly be looked upon as a member of the 

 Canarian fauna, I may nevertheless call attention in this place to the Bulimus 



