MADEIRAN GROUP. 231 



of the lip is considerably less thickened, being occasionally even 

 sub-obsolete ; the inner ventral plait is still smaller, it being very 

 short and deeply immersed ; and the upper one on the colu- 

 mella, as well as the first and third palatial ones, appear to be 

 absent. 



The P. ferraria is locally abundant on the mountains of 

 Porto Santo, particularly in the western division of the island, 

 — where it was first detected by myself, on the 7th of December, 

 1848, within the crevices of the exposed weather-beaten rocks 

 of the Pico d'Anna Ferreira. I subsequently obtained it in the 

 same locality during April 1849; and it was met with by Mr. 

 Lowe and myself (the former having also found it on the Pico 

 d'Espigao) in May of 1855. 



The localities given for the P. ferraria by the Baron Paiva, 

 in his late monograph, are not to be trusted, seeing that he 

 confounded it with the P. corneocostata (from the Cabeco da 

 Malhada) and the P. relevata (from the Ilheo de Baixo). I 

 have little doubt therefore that the 'Ilheo de Baixo' and the 

 * Ilheo de Ferro,' which are cited by him (in addition to the Pico 

 d'Anna Ferreira) for its habitat, pertain in reality to those 

 two species. 



Pupa degenerata, n. sp. 



P. subconico-cylindrica (sc. apicem versus obsolete subatten- 

 ata), opaca, pallide brunnea, remote sed argute et oblique cos- 

 tata ; anfractibus convexis, valde tumidulis, interdum obsolete 

 subfasciatis ; apertura parva, rotundata, distincte 1- (indistincte 

 4-)plicata, sc. 2 ventralibus (etiam exteriore parva brevi, inte- 

 riore minuta valde immersa inconspicua), 1 columellari parva 

 profunde immersa (superiore nulla), et 1 palatali immersa sub- 

 obsoleta ; peristomate subcompleto (i. e. inter plicam ventralem 

 exteriorem et columellam tenuiter continuato) ; labro extus 

 rotundato, clenticulo obsoleto, sinu aperto indistincto. — Long, 

 lin. 1-1^. 



Habitat Portum Sanctum ; exemplaribus quatuor (cum P. 

 monticolw var. ft. commixtis) a Barone Castello de Paiva com- 

 municatis. 



The four examples from which the above diagnosis has been 

 compiled, and which were mixed up with some specimens of the 

 ' var. /3. pumilio ' of the P. monticola which were obtained by 

 the Baron Paiva from Porto Santo, I at first thought might repre- 

 sent some degenerated state of the latter, in which the aperture 

 was reduced in dimensions and unusually rounded, and the plaits 

 almost obsolete ; nevertheless since they display a number of 

 other peculiarities, and moreover appear to stand in exactly the 

 same relation to that species as the P. laevigata does, in Ma- 



