MADEIRAN GROUP. 175 



volutions (instead of 7|), and it is surprising to me how the Baron 

 Paiva could have so far confused its affinities as to have recorded 

 it not only (as above indicated) as a stunted phasis of the H. poly- 

 morpha, but likewise as a distinct species (under the name of H. 

 Pitta) of the Caseolus group ! Yet that this is certainly the case 

 I am able to vouch, having received types of his H. Pitted from 

 the Baron himself. It is also to be noted that in his diagnosis of 

 the H. Pittce he does not even allude to the fact that his types were 

 subfossilized (as is nevertheless clear, not only from those which 

 he transmitted to me, but also from his own remark ' Animal 

 hodie non observare licet '), but describes them as ' cinereo-plum- 

 bea ' (a very common tint for a bleached, subfossilized surface), 

 thus leaving the impression that the H. Pittce is characterized by 

 an eccentricity of hue which certainly does not belong to it. 



s. Alleniana, Paiva. 



Helix All eniana,, Paiva, Jouim.de Conch, xiv. 342. p. 11. f. 10 

 (1866) 

 „ „ Id., I. c. 86. t. 1. f. 4 (1867) 



Habitat Maderam ; in collibus apricis submaritimis prope 

 Sta. Anna lecta. 



This modification of the H. polymorpha was first taken by the 

 late Mr. Bewicke at Sta. Anna in the north of Madeira pro- 

 per, and it appears to have been met with subsequently by 

 Senhor J. M. Moniz : but it is one of the few Helices which was 

 never obtained either by Mr. Lowe or myself. It is in some 

 respects intermediate between the ' ft. salebrosa ' and the ' £. 

 linctaf though differing from them both in its somewhat more 

 shining and lightly sculptured surface, and in its granules being- 

 much more minute and elongated, and transversely arranged, — 

 being formed by the breaking-up, or interruption, of the fine 

 transverse lines, and having more the appearance at first sight of 

 narrow abbreviated impressions than of granules. 



The • s. Alleniana ' (which is certainly not recognizable, as I 

 understand it, from the Baron Paiva's published figures) is a 

 flattened, lenticular shell, with the keel acutely expressed ; and 

 its underside is usually of a clear porcelain-white, with a narrow 

 reddish-brown band encircling the umbilical area, and another 

 broader one (sometimes two) towards the keel. Its upper side, 

 in the only fresh and perfect example which I possess for inspec- 

 tion, is irregularly mottled with dusky-white and reddish-brown, 

 the latter preponderating. Its umbilicus is much about the 

 same as in the average of the ' ft. salebrosa,'' but a trifle smaller 

 than in the ' £. lincta'' ; but in the widely separated, almost un- 



