478 TEST ACE A ATL ATTICA. 



Hydrocoena Gutta, Drouet, Faun. A^or. 170 (1861) 



„ „ 3fouss., Faun. Mai. des Can. 147 (1872) 



Habitat Teneriffam, et Palmam ; in locis valde hiimidis, saBpe 

 etiam subaquosis, et pra3cipue sylvaticis, occurrens. Ad rupes 

 prseruptas udas, supra oppidulum Garachico Teneriffae, abun- 

 dat, — una cum Hyalina Glymene, Pupa castanea., Physa 

 acuta, et Ancylus striatiis consociata ; et nunquam (nisi fallor) 

 in aridis, ut ait clariss. Mousson, degit. 



This extremely minute, Paludina-\ike shell, which occurs 

 also in the Azorean archipelago but which has not yet been ob- 

 served at the Madeiras, will most likely be found eventually to 

 be widely spread over the Canarian Group, although hitherto it 

 has not l3een observed except in TenerifFe and Palma. I have 

 myself, however, m.et with it abundantly in both of those islands, 

 — namely amongst the detritus about the roots of ferns, as well 

 as by beating their fronds, on some damp rocks in the wood of 

 Las Mercedes, of the former, within the constant douche of the 

 spray of a waterfall, and likewise in a somewhat similar situa- 

 tion at the edges of the Vueltas above Taganana ; whilst in 

 Palma my specimens were principally obtained, in the same 

 kind of moist places, in the Barranco de Galga. Mousson has 

 . consequently fallen into an unaccountable error in citing it as 

 living ' sous les pierres arides,' and (again) ' sous les pierres 

 dans les lieux arides,' for nothing could possibly be more untrue 

 to its TYiodus Vivendi. Indeed he has himself (however unwit- 

 tingly) settled the question as to its real habitat in the same 

 actual sentence ; for he expressly mentions that it was found in 

 company with the Hyalina Glymene and the Pupa castanea^ 

 and the only spot in which the former has hitherto occurred 

 (and I believe, also, the latter) is some trickling rocks, adjoin- 

 ing a small waterfall, above Garachico, in the north of Teneriffe. 

 Indeed that is the original locality from whence Planner's ex- 

 amples, subsequently described by Shuttleworth, were brought ; 

 and the latter particularly notes that they were taken ' sub saxis 

 udis in Teneriffa.' 



Apart from its diminutive bulk and imperforate shell, the 

 H. gutta may be known by its comparative freedom from sculp- 

 ture (the minute lines of growth being often very obscure) and 

 its only slightly shining surfice. The examples from the neigh- 

 bourhood of Garachico, which (as being the ones which were 

 described by Shuttleworth) must be regarded as typical, are 

 larger and of a more reddish-yellow tinge than those (the ' var. 

 ^. minor ') from the higher altitudes of both Teneriffe and 

 Palma. Shuttleworth having no other Teneriffan specimens to 

 judge from except those from the vicinity of Garachico, natu- 

 rally regarded the Palman ones only as representing his ' var. 



