860 TEST ACE A ATLANTIC A. 



of which measures about 11 lines across its widest part) which 

 were received by the Baron Paiva from Gromera, and there can be 

 no doubt that it is the species which was described by Morelet. 

 In proportion to its size the shell is extremely thin and fragile, 

 being more than usually sub-diaphanous when held up to the 

 light ; and its colour is a deep castaneous-brown, but rather 

 paler (or more olivaceous) beneath, with extremely indistinct 

 indications of three obsolete darker bands, one of which is just 

 below the dorsal line, another immediately above it, and the 

 third a little behind the suture (the space between this last one 

 and the suture being sometimes, apparently, though not in the 

 specimens now before me, of a more lively ochreous yellow). In 

 outline the H. gomerensis is somewhat depressed ; its ultimate 

 volution, which is angulated posteriorly but rounded and obtuse 

 in front, is very broadly developed ; and its aperture is large, 

 the peristome being thin but slightly recurved, with the margins 

 (the basal one of which is only narrowly expanded) wide apart 

 and disconnected. Its surface, which is subopake above but 

 more shining in the central area below, is finely and very 

 densely, but unequally, costate-striate ; and, when viewed 

 Ijeneath a high magnifying power, it will be seen to be most 

 closely covered with excessively minute and ill-defined sand- 

 like granulations. 



Helix hierroensis. 



Helix Hierroensis, Grasset, Journ. de Conch, v. 345 (1856) 

 Pfei/., Mon. Hel. iv. 231 (1859) 



Valverdensis, Lowe, Ann. Nat. Hist. vii. 110 (1861) 

 Hierroensis, Mouse., Faun. Mai. des Can. 98 (1872) 



Habitat Hierro; in intermediis ad oppidum Valverde 

 lecta. 



This is a Helix which was taken abundantly by Mr. Lowe 

 and myself in a garden at Valverde, in Hierro ; and it appears 

 to have been met with previously both by Grasset and Fritsch 

 in the same island. It is much smaller than the H. gomerensis 

 (measuring only about 9 lines across its widest part), and rather 

 more globose in contour ; but in colour and sculpture it has 

 much in common with that species. It is, however, a little 

 more strictly opake on the upper surface (the minute sand-like 

 granules with which it is closely beset being perceptibly coarser 

 and more defined) ; and its colour is of a dull olivaceous coffee- 

 brown, rather than of a reddish castaneous. It has less traces, 

 too, of a keel on the posterior half of the basal whorl (which is 

 itself less broadly developed) ; its aperture is relatively smaller ; 

 and its peristome is whiter and a trifle more thickened. Its 

 three bands are quite as obscure as in the H. gomerensis, being 



