CANAEIAN GROUP. 365 



Helix consobrina. 



Helix consobrina. Per., Prodr. 72 (1821) 



?? Mouss., Faun. MaL des Can. 94. pi. 5. 



f. 14, 15 (1872) 



Pfeiff., Mon. Hel. 360 (1 876) 



Habitat Teneriffam ; in sylvaticis intermediis occurrens. 

 The H. consobrina, which is so closely allied to the Grrand- 

 Canarian H. Guanartemes that I can detect absolutely nothing 

 to separate it except its white and rather thinner peristome and 

 its just appreciably longer columella, is peculiar apparently to 

 the sylvan regions of Teneriffe, at intermediate altitudes, my 

 own examples being principally from the wood of the Agua 

 Grarcia. In prima facie aspect it is almost inseparable from 

 the H. Guanartemes ; and I have already pointed out what the 

 main characters are which apply equally to the two forms. 



Helix invernicata, 



Helix consobrina. W. et. B. [nee Fer., 1821], Ann. des Sc, 



Nat. 28. syn. 311 (1833) 



tfOrb., in W. etB. Hist. 54 (1839) 



Pfeiff., Mon. Hel. i. 269 (1848) 



invernicata, Mouss., Faun. Mai. des Can. 95. pi. 5. 



f. 13(1872) 



Pfei/., Mon. Hel. vii. 346 (1876) 



Habitat Teneriffam; in truncis cavernosis Laurorum et 

 Ericoz in sylva ad ' La Esperanza ' (ultra Laguna sita) congre- 

 gans. 



This is a Helix which has generally been considered to be 

 the true H. consobrina of Ferussac, but one which Mousson 

 has separated from the consobrina proper ; and I think per- 

 haps that it may be accepted as specifically distinct, though I 

 cannot feel absolutely satisfied that it is more in reality than a 

 smaller and ungranulated race of the consobrina, in which the 

 transverse lines of growth are a trifle less evident and the mal- 

 leations relatively a little more so, and in which the surface is 

 altogether more glossy and shining, and the colour is of a more 

 uniform ochreo-olivaceous brown speckled with small irregular 

 angulated blotches, and fragmentary reticulations, of yellow. 

 Its ultimate volution, also, does not descend quite so much, or 

 quite so suddenly, in front, and is rather less constricted (and 

 therefore less gibbose) at the aperture. Judging from my own 

 material and that of Mr. Lowe, the H. invernicata is decidedly 

 a smaller shell than the consobrina proper, nevertheless Mous- 

 son's diagnosis would imply that it is larger. 



