336 TEST ACE A ATLANTIC A. 



and Palma. In the first of those islands it was obtained by 

 Mr. Lowe and myself in the woods above Taganana, at Las 

 Mercedes, and above Orotava, as well as at Los Sillos and near 

 Grarachico and Ycod-el-Alto-; in the second by Mr. Lowe (on 

 April 21, 1861) on the Cumbre above the San Sebastian Bar- 

 ranco ; and in the third by Mr. Lowe and myself, on the ascent 

 to the Cumbre above Buenavista, as well as in the Barranco de 

 Agua, the Barranco de Gralga, and at Barlovento. In Teneriffe 

 it was found also by Blauner and Fritsch. 



( Pomatia, Beck.) 

 Helix aspersa, 



Helix aspersa, Mull., Hist. Verm. ii. 59 (1774) 

 Pfeiff., Mon. Hel. i. 241 (1848) 



spumosa, Lowe, Ann. Nat. Hist. vii. Ill (1861) 

 aspersa, Mouss., Faun. Mai. des Can. 69 (1872) 



Habitat Palmam ; hinc inde in intermediis degens, forsan 

 ex Europa olim introducta. 



The common European H. aspersa, Miill., which has ac- 

 quired for itself so wide a geographical range, occurs sparingly, 

 in many localities, in Palma ; but as it has not been observed 

 hitherto in any other portion of the Grroup, it is pretty certain 

 that it must have become accidentally introduced, at some 

 former period, into that particular island, just as it has at the 

 Azores, and (more recently) around Funchal in Madeira, and 

 even at St. Helena. In Palma (where it was found also by 

 Blauner and Fritsch) we met with it at the foot of the ascent to 

 the Cumbre above Buenavista (on the road from Sta. Cruz to 

 La Banda), as well as in the Barranco de Herradura (between 

 Los Souces and Barlovento). 



Although some of the Palman examples of this common 

 Helix are apparently quite typical (a fact which does not seem 

 to have been sufficiently recognised by Mr. Lowe), in others the 

 shell is rather thinner and paler, with the spire perhaps a trifle 

 smaller and more depressed, and with the aperture a little more 

 transverse, approaching in a slight degree the H. Mazzullii, 

 Jan., from Sicily. I agree, however, with Mousson that there is 

 nothing about them to warrant the suspicion that they are 

 specifically distinct ; though a rather fanciful capability which 

 the animal appeared at the time to possess, of secreting 

 mucus in greater abundance than is usual for the H. aspersa, 

 induced Mr. Lowe to separate them as a species under the 

 title of H. spumosa. 



