410 TJESTACEA ATLANTIC A. 



After a careful examination of the H. deusta, Lowe, which 

 was detected by myself at a high altitude in the same island 

 (namely amongst wet sticks and leaves at the edge of a small 

 trickling stream which issues from some rocks in the Great 

 Pinal, close to, but outside, the Caldeira), I have come to the 

 conclusion that it will be better treated as a dwarfed and more 

 distinctly fasciated state of the oleacea than as a variety of the 

 persimilis. Most of its characters, such as they are, accord 

 better with those of the former than of the latter, — such, for 

 instance, as its apically obtuse, sublenticular contour, its less 

 keeled basal wliorl, its somewhat finer sculpture, and its browner 

 or less maculated (though by no means unfasciated) surface. In- 

 deed there is very little except its smaller size, and more 

 banded and perhaps just appreciably less broadly developed volu- 

 tions, and its somewhat less covered umbilicus, w^hich would 

 seem to separate it from the (equally fragile) //. oleacea ; and I 

 think therefore that it will be sufficient to place it on record 

 as the ' var. a. deusta, Lowe.' Nevertheless in some respects 

 it must be admitted that it is slightly intermediate between 

 the H. oleacea and the persimilis. I will just add, however, 

 that there must have been a mistake in ]Mr. Lowe's mea- 

 surement of the shell, which is much smaller than his diag- 

 nosis would indicate, — even the largest examples being only 

 3 lines across, in their broadest part. 



Helix Woodwardia. 



Helix Woodwardia, Tarnier, in litt. 



„ „ Mouss., Faun. Mai. des Can. 45. pi. 2. 



f. 48-50 (1872) • 

 Pfeiff., Mon. Hel. vii. 102 (1876) 



Habitat Teneriftam ; in humidis sylvaticis editioribus, 

 rarior. 



This rare and exceedingly fragile little Helix has been ob- 

 served hitherto only in the sylvan districts of Tenerifte, — where 

 it was met with by Grasset, Fritsch,and Reiss, and subsequently 

 (particularly in the forest region above Taganana) by Mr. Lowe 

 and myself. 



The H. Woodwardia (which is a good deal allied to the 

 Palman H. oleacea, Shuttl.) is even thinner and more fragile 

 than its immediate allies ; and it further differs from them 

 in its relatively larger and more open umbilicus, and its total 

 freedom from spots and bands, — its entire surface being of a 

 pale, uniform, yellowish- (or whitish-) corneous hue, though 

 some of the coarse and densely-packed striae with which it is 

 uniformly covered will be seen (when closely inspected) to be a 



