CANARIAN GROUP. 409 



character, however, I have not the least reason to think that 

 the ' a. umbilicata ' is anything more than a rather highly de- 

 veloped submaritime state of the persimilis, the species being 

 essentially an inconstant one ; though I may just add, that, like 

 Mousson, I should probably have identified it with Shuttle- 

 worth's H. ccementitia, was not the latter (which is a shell 

 without any positively defined habitat) expressly said to have its 

 aperture calloso -labiate within, and the upper and lower por- 

 tions joined across the body volution by a white corneous lamina. 

 These two characters are of themselves so important that I think 

 it well-nigh impossible to treat this form of the persimilis 

 which we are now discussing as representing the (very much 

 larger) H. ccementitia of Shuttle worth, the precise country of 

 which is practically unknown. 



Helix oleacea. 



Helix oleacea, ShuttL, Bern. Mitth. 142 (1852) 

 Pfeiff., Mon. Eel. iii. 129 (1853) 



deusta, Lowe. Ann. Nat. Hist. vii. 106 (1861) 

 Pfei/., Mon. Hel. v. 126 (1868) 

 oleacea, Mouss., Faun. Mai. des Can. 43. pi. 2. f. 



45-47 (1872) 



et deusta, Pfeiff., Mon. Hel. vii. 127 et 300 



(1876) 



Habitat Palmam; in intermediis editioribusque sylvaticis 

 humidis, rarius. 



If the many examples which I obtained in the intermediate 

 and lofty sylvan districts of Palma are truly referable to the H. 

 oleacea, Shuttl. (and I have every reason to believe that they 

 are) the present species may be said to be a little larger and 

 more lenticular (or Patula-sh&ped) than the persimttis, the 

 keel being appreciably less developed, and the spire (which is 

 composed of at least half a volution less) more obtuse ; and it is 

 also still thinner, or more fragile, rather less strongly stri- 

 iated, and of a more uniform pale yellowish-brown, there 

 being few indications (indeed scarcely any at all) of fasciae and 

 spots. Its peristome, although thin and acute, has a little more 

 tendency to be subrecurved, at any rate towards the umbilicus 

 (which is, consequently, rather more concealed from view) ; and 

 its surface is nearly free from gloss. It is a species which has 

 been observed hitherto only in Palma, where it was found by 

 Blauner, and subsequently by Mr. Lowe and myself. Amongst 

 the various localities in which we met with it, I may cite the 

 Barranco de Agua, the Barranco de Galga, El Monte, Bar- 

 lovento, and the Cumbre above Buenavista. 



