470 TEST ACE A ATLAXTICA. 



Ancylus striatus, cVOrb., in W. et B. Hist. 75 (1839) 



„ adunciis, Gould, Proc. Bost. S. N. H. ii. 210 



(1848) 

 „ fluviatilis, Lowe [vix Milll.'], Proc. Zool. Soc. Loncl. 



218 (1854) 

 „ aduncus, Alb., Mai. Mad. 74. t. 16. f. 37, 38 



(1854) 

 „ striatus, Mouss., Faun. Mai. des Can. 141 (1872) 

 „ fluviatilis, Watson, Journ. de Conch. 224 (1876) 



Habitat Canariam Grandem, TenerifFam, et Palmam ; in 

 aquis et aquosis hinc inde vulgaris. 



This appears to be the same Ancylus which is so abun- 

 dant at intermediate and lofty elevations in Madeira ; and 

 although it was regarded in that archipelago, by Mr. Lowe and 

 subsequently by Mr. Watson, as not differing specifically from 

 the common European A. fluviatilis, I have nevertheless 

 already stated why I consider it better to follow those naturalists 

 who have regarded it as distinct. Still, I am by no meaas 

 satisfied that it represents more, in reality, than a geographical 

 phasis of that species. 



I have taken the A. striatus in Teneriffe and Palma, — -in 

 the former of which it was met with by Webb at the Agua 

 Garcia (misspelt by Mousson ' Aguas Gracias '), and by Blauner 

 and Lowe on wet rocks near Garachico. In Grand Canary it 

 was obtained abundantly by Mr. Lowe, at a fountain in the 

 lofty central Pinal of Tarajana, above San Bartolome, during 

 our visit to that remote locality on the 8th and 9th of April 

 1858 ; and I have lately inspected examples which were found, 

 a few years ago, by Mr. Watson, at Tafira. 



Ancylus rupicola. 



Ancylus rupicola, Hhuttl., in litt. 



„ „ Mous!^., Faun. Mai. des Can. 141. p. 6. 



f. 34, 35 (1872) 



Habitat Teneriffam ; ad Guimar a D. Blauner repertus. 



I should very much doubt whether this is anything more 

 than a small and perhaps not quite mature, or at any rate an 

 ill-developed state of the Protean A. striatus, — possibly corres- 

 ponding with what I have cited as a ' var. /8. depauperatus,'' of 

 that species in the Madeiran Group ; for stunted examples of 

 the shell often have their radiating costse quite obsolete, and 

 present a very different appearance at first sight from those 

 which are larger and more highly matured. Nevertheless since 

 I have not been able to procure a type for comparison, and 

 Mousson's diagnosis gives several characters which might seem 



