MADEIBAN GROUP. 237 



In a subfossil state the P. lamellosa occurs, though very 

 rarely, in the calcareous beds near Canical. 



(§ Stawrodon, Lowe.) 

 Pupa saxicola. 



Pupa saxicola et seminulum, Lowe, Ann. Nat. Hist. ix. 



(1852) 

 Pfdff., Man. Hel. iii. 559 (1853) 

 et seminulum, Lowe. Proc. Zool. Soc. Lond. 

 214(1854) 

 , „ „ Alb., Mai. Mad. 62. t. 16. 



f. 13, 14(1854) 

 „ „ Paiva, Mon. Moll. Mad., 139 



(1867) 



Habitat Maderam : sub lapidibus in aridis saxosis submari- 

 timis bine inde vulgaris. In statu semifossili juxta Canical 



parce occurrit. 



Well distinguished from all the other members of the genus 

 here enumerated by its extremely minute size (it being the 

 smallest of the Madeiran Pupce), by the paucity of its subven- 

 tricose volutions (in which respect it agrees with the P. fana- 

 lensis), by its outline being somewhat obesely oblong, or almost 

 equally attenuated before and behind, by its surface being sub- 

 opake and very densely and delicately striated, and by its aper- 

 ture being rather small and a good deal rounded, — the ' sinus ' 

 and labial tooth being obsolete. Its plaits too are somewhat 

 peculiar, — the outer ventral one forming a small but prominent 

 tubercle nearly adjoining the angle of the lip, whilst the four 

 inner ones are large but deeply immersed. 



The P. saxicola occurs beneath stones and scoriae in dry 

 rocky spots, of a low elevation, in the south of Madeira proper, 

 and was first taken by myself, during April 1848, at the Praia 

 Bay, to the westward of Funchal (where it was also met with by 

 Mr. Leacock on the 1st of May of the same year), — under loose 

 pieces of basalt, at the top of the cliff, at the eastern end ; and 

 it has likewise been found, according to the Baron Paiva, 

 at the Feijaa dos Asnos and the Cabo Girao. 



The P. seminulum, Lowe, which was detected by Mr. Lea- 

 cock at the Cabo Grarajao, or Brazen Head, does not appear to 

 me to differ specifically, in any single particular, from the pre- 

 sent species. 



In a subfossil condition the P. saxicola is not uncommon in 

 calcareous deposits near Canical. 



