CANARIAN GROUP. 383 



ties being far more with the Actinella-section of Madeira, re- 

 presented by the H. lentiginosa and its immediate allies. 1 



As compared with the Madeiran H. lentiginosa, the present 

 species (the name of which I have been compelled to change, 

 the title torrefacta having been preoccupied in 1849 for a 

 Helix from Jamaica) is a trifle larger and more solid (or less 

 subtransparent), with a rather wider umbilicus, and with its 

 aperture somewhat more developed and less circular, — the 

 peristome being both less recurved and more interrupted (or 

 less continuous) across the body-volution. Then, as regards 

 ornamentation, clothing, and sculpture, the differences are still 

 more apparent, — the H. Loweana being almost white beneath 

 (instead of a dull yellowish horny-brown), with merely a broken- 

 up fascia near to the keel, whilst the whole portion visible from 

 above is reddish-brown but blotched with a few irregular 

 though well-defined white transverse patches. Moreover the 

 H. lentiginosa is a strictly (though sparingly) pilose species ; 

 whereas the Loweana has only its spiral lines furnished with 

 excessively diminutive and abbreviated lacinicv~\\ke fragile 

 bristles : and the sculpture of the lentiginosa consists merely 

 in irregular, oblique subconfluent costse, instead of the sharp 

 densely-packed undulating ridges of the Loweana, intersected 

 (or decussated) by the infinitesimal spiral lines to which I 

 have already called attention. 



The H. Loweana has been observed hitherto only in Lanza- 

 rote, — where it was met with by myself, and subsequently by 

 Mr. Lowe, on the dry exposed maritime cliffs, known as the 

 Risco, in the extreme north of that island and overlooking the 

 Salinas. They were taken chiefly from amongst lichen, within 

 the crevices, and on the actual surface, of the hot rocks, in 

 places directly exposed to the sun ; and Mr. Lowe also obtained 

 examples in the neighbouring district of Chache. 



(§ Htspidella, Lowe.) 

 Helix leprosa. 

 Helix leprosa, Shuttl, Bern. Mitth. 142 (1852) 

 „ „ Pfeiff., Hon. Hel. iii. 130 (1853) 



„ „ Mouss., Fawn. Mai. des Can. 61. pi. 3. f. 31- 



33 (1872) 

 „ „ Pfeiff., Mon. Hel. vii. 273 (1876) 



1 It was not until after I had arrived at this conclusion independently, 

 that I observed Mr. Lowe's note, to exactly the same effect, accompanying his 

 diagnosis of the JET. torrefacta. ' The nearest ally,' says he, 'of this very dis- 

 tinct and well-marked little species is the Madeiran H. lentiginosa. The 

 numerous fine thread-like or lamellar spiral stria? resemble those of the com- 

 mon sylvan Teneriffan H. drcumsessa, Shuttl., which is however as distinct 

 in habit as in habitat, — belonging to the group Lucilla.' 



