MADEIRAN GROUP. 85 



species has itself been brought to light, within the last few- 

 years, in no less than two distinct, and distant, parts of the 

 archipelago. 



The P. Guerineana is decidedly a rare species, and one 

 which is confined to the damp sylvan districts of Madeira 

 proper at intermediate and lofty altitudes, — where it is most 

 unmistakeably aboriginal, or indigenous. It occurs sparingly 

 in many of the deep wooded ravines, in the interior of the 

 island, beneath stones and decaying vegetable refuse, and was 

 first detected (so far as I am aware) in the Levada of the 

 Ribeiro Frio (into which it had fallen from the overhanging 

 bank above) by Miss J. C. Gueriu — after whom the species is 

 named. 



Patnla rotnndata. 



Helix rotundata, Milll., Hist. Verm. ii. 29 (1774) 

 Eatula rotundata, Held, in Isis, 916 (1837) 

 Helix rotundata, P/eiff., Mon. Hel. i. 105 (1848) 

 „ „ Morel., Hist. Nat. ties A cor. 174 (I860) 



„ „ Paiva, Mon. Moll. Mad. 81 (1867) 



„ „ Watson, Journ. de Conch. 222 (1876) 



Habitat Maderam, et (sec. B. de Paiva) ins. parvam juxta 

 Portum Sanctum ' Ilheo da Fonte d'Areia ' dictam ; rarissima. 



A single example of this common European Patula was ob- 

 tained by the Baron Paiva (as asserted in his Monograph), 

 during 1864, from the little uninhabited rock off the N.W. 

 coast of Porto Santo known as the Ilheo da Fonte d'Areia ; and 

 it would appear that he has since received a few others from the 

 same remote spot. I possess these specimens (which were trans- 

 mitted to Mr. Lowe), and also several more which were taken 

 by the Rev. R. B. Watson in 1866 at the Jardim da Serra 

 (about 2,000 feet above the sea) in Madeira proper ; so that I 

 think we have no option but to admit the species into our 

 catalogue. It would seem highly probable however that its 

 presence at the Jardim da Serra may be the result of an acci- 

 dental introduction from England during a comparatively recent 

 period, inasmuch as it is well known that the late Consul Mr. 

 Veitch was in the habit of receiving consignments of plants for 

 his garden at the Jardim ; but the existence of the shell on a 

 distant and well-nigh inaccessible rock is a fact, if truly to be 

 depended upon, which cannot be glossed over by any such 

 supposition, and one which would tend to place the P. rotun- 

 data amongst the autochthones of the archipelago. Perhaps 

 however its occurrence in even such a spot is, at any rate, not 

 more remarkable than that of the European Balea perversa on 

 the extreme summit of the Pico de Facho in Porto Santo, or 



