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 persimUis, — the species being 

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

 Mousson, I should probably have identified it with Shuttle- 

 worth's H. camientitia, 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 persimUis 

 which we are now discussing as representing the (very much 

 larger) H. ccementitia of Shuttleworth, — the precise country of 

 which is practically unknown. 



Helix oleacea. 



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

 „ „ Pfeiff., Mon. Hel. iii. 129 (1853) 



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

 „ „ Pfeiff., 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-slmiped) than the persimUis, 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 fasciee 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. 



