470 TEST ACE A ATLANTIC A. 



Ancylus striatus, d'Orb., in W. et B. Hist. 75 (1839) 



aduncus, Gould, Proc. Bost. S. N. H. ii. 210 



(1848) 

 fluviatilis, Lowe [vix Mull.'], Proc. Zool. Soc. Lond. 



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. jluviatilis, 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 means 

 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 Final 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, Shuttl., in litt. 



Mouss., 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. p. 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 



