MADEIRAN GROUP. 207 



towards the Gorgulho, a locality in which it was first found, 

 many years ago, by Mr. Lowe, and where it has subsequently 

 been met with by Mr. Leacock, the Rev. R. B. Watson, Senhor 

 J. M. Moniz, and others. 



Genus 10. PUPA, Drap. 



( Truncatellina, Lowe.) 



Pupa linearis. 



Pupa linearis, Lowe, Ann. Nat. Hist. ix. (1852) 

 Id., Proc. Zool. Soc. Lond. 207 (1854) 



Paiva, Mon. Moll. Mad. 119 (1867) 

 minutissima, Watson, Journ. de Conch. 223 (1876) 



Habitat Maderam ; in stratu conchylifero ad Canical semi- 

 fossilis haud infrequens ; recens hodie non detecta. 



The excessively minute size of this little Pupa (the smallest 

 of the Madeiran species with the exception of the P. saxicola, 

 and one which has been found hitherto only in a subfossil state), 

 added to its parallel outline, rather tumid, distinctly striated 

 volutions, and its small and perfectly edentate mouth, will suffi- 

 ciently characterize it. Like most of the Pupa? it has a longer 

 and a shorter state, some examples appearing to possess a volu- 

 tion more than the others. It is said to be closely allied to the 

 European P. minutissima, Hartm., indeed Mr. Watson regards 

 it as identical with that species ; but it is, I think, more parti- 

 cularly interesting from the fact that it so nearly resembles a 

 diminutive member of the genus from the Cape Verde archipe- 

 lago, described by Dr. H. Dohrn as the P. molecula, that until 

 I had compared the two very accurately I felt almost satisfied 

 that they were conspecific. Indeed even now I am far from 

 convinced that they may not be in reality but geographical 

 phases of a single type; nevertheless since the P. linearis 

 seems to be, on the average, a trifle smaller than its representa- 

 tive from the Cape Verdes, with its volutions perhaps not quite 

 so convex, its suture appreciably more horizontal (or less 

 oblique), and its aperture relatively less developed, I will not 

 venture to treat them as otherwise than distinct. 



The P. linearis is not uncommon in the calcareous, subfos- 

 siliferous deposits near Cani9al ; but it has not yet been observed 

 in those either of Porto Santo or the Southern Deserta. 



Pupa microspora. 



Pupa microspora, Lowe, Ann. Nat. Hist. ix. 275 (1852) 

 Pfeiff., Mon. Hel. iii. 532 (1853) 



