CANAR1AN GROUP. 417 



Bulimus Guerreanus, Grasset, Journ. de Conch, v. 3-47 



(1856) 

 Pfeiff., Mon. Hel. iv. 50 (1859) 

 Buliminus Guerreanus, Mouss., Faun. Mai. des Can. Ill 



(1872) 

 Bulimus Gruerreanus, Pfeiff.^ Mon. Hel. viii. 185 (1876) 



Habitat Gomeram, et Hierro; ad rupes et muros in locis 

 editioribus adbserens. 



I cannot agree with Mousson that this singular Bidimus is 

 in any respect allied to the badiosus, Fer., — with which, as it 

 seems to me, it has absolutely nothing whatever in common. 

 It belongs to a totally different type, and stands completely 

 isolated amongst the Canarian members of the group. Perhaps 

 the form (although totally dissimilar from it) to which it makes 

 the nearest approach is the Lanzarotan ' var. a. rufobrunneus ' 

 of the B. variatus, — which has a similar habit of coating itself 

 over with a hardened envelope of coarse dirt, and which occurs 

 (in like manner) on the rocks of a comparatively high altitude. 

 Moreover both species are remarkable for their thin and sub- 

 pellucid substance, their rather shining and totally ungranulated 

 surface, the extreme convexity of their whorls, and the acute- 

 ness of their peristome, — which however is a little more thick- 

 ened and expanded in the Lanzarotan one than it is in the 

 B. Guerreanus (in which the border is quite thin and unre- 

 flexed, except towards the insertion of the columella). 



Apart from its semitransparent and well-nigh membraneous 

 texture, the B. Guerreanus is conspicuous for its short, some- 

 what inflated, and conico-ovate outline, for the smallness of its 

 umbilical chink, and for its olivaceous, or pale greenish-brown, 

 hue. The intervening lamina, between the margins of its 

 peristome, is (as in the Lanzarotan shell) so thin as to be 

 barely traceable, and it is also perfectly simple. 



The present Bulimus was taken abundantly by Mr. Lowe 

 and myself, adhering principally to old walls, in and around 

 Valverde, in the island of Hierro, where it would appear to have 

 been met with previously by Grasset ; and it was subsequently 

 found by Mr. Lowe (namely on the 21st of April, 1861), at a 

 high elevation, on rocks, a little below the Cumbre above San 

 Sebastian, in Gomera. 



Bulimus variatus. 



T. sequenti (sc. B. myosotis) paululum minus gracilis, an- 

 fractu ultimo sc. subbreviore et vix magis subinflato, plerumque 

 subnitidior [i.e sensim minus opaca), vix minus solida, ssepius 

 magis obscure (i.e. minus pallide) brunnea, et interdum (tamen 



E E 



