MADEIRAN GROUP. 177 



ad basin montis Piedade, ad proinontorium Sancti Lourentii, 

 vulgaris. 



The ' 7]. arenicola ' scarcely differs from the ' £. linctaj except 

 that it is, on the average, a little smaller, perhaps a trifle more 

 depressed, not quite so solid in substance, and altogether of a 

 paler, yellower, and less brightly variegated hue. It appears to 

 be confined to the region of the Fossil-bed and around the Pie- 

 dade, at the base of the Sao Lourenco promontory, in the east of 

 Madeira proper, — where it is extremely common, beneath stones, 

 on the sandy calcareous soil above the sea-beach and up the ad- 

 joining slopes ; but, being a mere local race peculiar to that 

 immediate calcareous district (so exceptional in Madeira), I am 

 not aware that it has occurred elsewhere in the island. 



6. Barbosce, Paiva. 



Helix Barbosae, Paiva, Joum. cle Couch, xiv. 341.pl. 11. 



f. 8 (1866) 

 „ Id., 1. c. 90. t, 1. f. 6 (1867) 



Habitat Portum Sanctum, aut potius ins. parvam adjacentem 

 ' Ilheo da Fonte d'Areia ' dictam ; sat vulgaris. 



The present Helix was obtained by the Baron Paiva, in 1864, 

 from the small and uninhabited rock off the north-western coast 

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

 certainly no more right to be specifically separated from the 

 numerous modifications of the H. polymorpha than any of the 

 others (indeed not so much as several of them) ; yet the Baron 

 erects it along with two equally insignificant forms into (so- 

 called) ' new species,' and that too whilst suppressing the H. pul- 

 vinata, discina, papilio, lincta, and senilis, of Lowe, — which, 

 although (as I fully believe) mere varieties also, are neverthe- 

 less quite as worthy of distinction as these three of his own ; 

 whilst the fact that they had been already defined and pub- 

 lished, ought to have given them in reality a superior claim. 



The ' 6. Barbosce ' is a tolerably large and subcorneal shell, 

 the spire being a good deal elevated, with the volutions flattened, 

 and the keel rather acute ; its basal portion is somewhat in- 

 flated and pulvinate (or cushion-shaped), with the umbilicus 

 distinct and spiral ; its peristome is rather thin, with the upper 

 and lower margins but imperfectly connected by a thin corneous 

 lamina ; and its surface (which is finely granulate all over, and 

 has the transverse lines conspicuous above) is somewhat peculiar 

 in colouring, — being darkly clouded on the upper side with irre- 

 gular brownish and reddish-brown markings, with the addition 

 of a more or less faint livid (or plumbeous) tinge or bloom, but 

 paler below in the centre, outside of which the fascia? are gene- 



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