390 TESTACEA ATLANTICA. 



elevation than the hispidula. Our examples were principally 

 from the Barranco del Passo Alto, and the ravine Ijeyond it (in 

 the direction of Point Anaga), as well as from the hills to tlie 

 north of the town, especially towards El Campo, — where Mr. 

 Lowe obtained it in profusion on the summit of a rocky emi- 

 nence about 2,000 feet above the sea. 



The H. fortunata is a larger, more lenticular, and a trifle 

 more depressed shell than the H. hisjnda, and with its keel 

 very much more acvite and appreciably flattened-out (on the 

 upper side), or compressed, and traceable up the spire ; its 

 surface (which is free from the remote granules which mark, on 

 the upper side, the positions of the hairs in the young examples 

 at all events of the 'var. /3. Bertheloti^) is less opake, and 

 rather more closely costate-striate ; its umbilicus is considerably 

 wider ; and the lower margin of its peristome is perhaps some- 

 what more broadly expanded. 



Helix beata, n. sp. 



T. umbilicata, lenticularis, acute carinata, nitidula, dense et 

 grosse plicatulo-striata, (saltem in statu adulto, sed an in imma- 

 ture ?) calva, pallido-cornea ; spira planata, valde depressa ; 

 anfractibus 5^, lente crescentibus, ultimo (supra et infra) ad 

 carinam compresso, antice breviter et paululum defiexo, subtus 

 convexo-inflatiusculo ; apertura obliqua, securiformi, peristomate 

 acuto, marginibus late separatis et lamina subnulla junctis, 

 columellari anguste expanse, reflexo, umbilicum (parvum, pro- 

 fundum, et subito, sed haud angulatim, excavatum) vix attin- 

 gente. — Diam. onaj. lin. vix 6 ; alt. 2. 



Ohs. — H. fortunatcc, Tenerififse, affinis, sed paulum minor, 

 subnitidior, spira depressiore, valde deplanata, carina sensim 

 magis compressa sed vix supra suturam in spira visibili, 

 anfractu ultimo subtus convexiore et magis inflato, umbilico 

 sensim angustiore magisque subito excavato, necnon peristo- 

 matis marginibus (columellari minus expanso) magis remotis. 



Ab H. planaria. Lam., differt testa multo minore grossius- 

 que striata, carina multo minus acuta, anfractu ultimo antice 

 magis descendente, necnon umbilico angustiore, minus spiraliter 

 visibili, et minus angulatim excavato. 



Habitat Fuerteventuram ; exemplar unicum communicavit 

 Baronus de Paiva. 



The single example from which the above diagnosis has 

 been compiled was obtained by the Baron Paiva from Fuerte- 

 ventura, and it certainly seems to me to represent a distinct 

 and undescribed member of the hispidula group. It is more 

 nearly allied to the H. fortunata, Shuttl., of Teneriflfe, than to 



