CANARIAN GROUP. 327 



haps its nearest ally in this archipelago is the (nevertheless more 

 highly coloured) P. putrescens, Lowe, from Palma, with 

 which in its flattened, discoidal contour and tumid volutions it 

 to a certain extent agrees. From the Hyalina circumsessa, 

 Shuttl., it is totally distinct by, inter alia, its smaller size and 

 very much smaller umbilicus, by its more flattened spire and 

 much less developed basal volution, and by its entirely wanting 

 the spiral hair- like lines which are so eminently characteristic 

 of that species and its two immediate allies. 1 



In its general size and hue, as well as in the proportion of its 

 umbilicus, the P. garachicoensis has also, at first sight, a little 

 in common with the P. Bertholdiana, Pfeiff., from the Cape 

 Verdes. It is, however, more flattened and discoidal than that 

 species (or less lenticular^), its surface is more strongly and 

 roughly sculptured, and, although the spire is much depressed, 

 its volutions are nevertheless more tumid, the basal one more- 

 over being quite free from the slightest trace of a keel. 



( Janulus, Lowe.) 



Patula Pompylia. 



Helix Pompylia, Shuttl., Bern. Mitth. 140 (1852) 

 Pfeiff., Mon. Hel. iii. 122 (1853) 



Patula Pompylia, Mouss., Faun. Mai. des Can. 27. pi. 2. 



f. 29-32 (1872) 

 Helix Pompylia, Pfeiff., Mon. Hel. vii. 128 (1876) 



Habitat Palmam ; in sylvaticis editioribus rarissima. 



This may be regarded, in the Canarian archipelago, as the 

 representative of the Madeiran P. stephanophora, Desh., with 

 which, in its general outline and in the character of its sculp- 

 ture, it has a good deal in common. It is, however, consider- 

 ably smaller than that species, and its umbilicus is both still 

 more diminished in width and more suddenly scooped out ; its 

 spire is relatively a little more depressed ; its under-portion is 

 more convex, and rather less opake ; and the costse of its 

 whorls are more closely set together, and, although much 

 raised, not quite so elevated or quite so curved. 



The P. Pompylia seems to be of the greatest rarity, and 

 confined (so far as has been observed hitherto) to Palma, where 

 it occurs in the damp wooded districts of a high altitude. It 



1 The single example, now before me, which I have enunciated above as 

 representing a'var. . submarmorataS was received from M. Berthelot as 

 undoubtedly Teneriffan ; and in all probability it is the exponent of some 

 local race, or slight modification, of the P. ffarachicoensis, peculiar to another 

 district. It differs in being a trifle more fragile and less coarsely sculptured, 

 in its spire being less depressed, and in its volutions being very obscurely 

 dappled with a few faint and irregular paler markings. 



