214 TEST ACE A ATLANTIC A. 



Habitat Maderam oditiorcm sylvaticam ; in frondibus filicum 

 humidis prsecipue pccurrens. 



The rather large side, and conical, subtriangular outline of 

 the P. chellogona — which is much pointed towards the apex, 

 and a good deal widened towards the base, and has the mouth 

 considerably (and obliquely) produced downwards — added to its 

 fiattene'd volutions, its pale-brown, obscurely banded, not very 

 shining surface, its sinuated outer lip (on which the tooth is 

 nevertheless exceedingly obtuse and ill-expressed, causing 

 the ' sinus ' to be wide and open), and the large size of its 

 exterior ventral and its lower columellary plaits (the former 

 of which is far removed from, and totally disconnected with, 

 the angle of the peristome), will serve to distinguish it. Its 

 inner ventral plait is also very conspicuous, although much 

 smaller than the outer one ; but the upper columellary and the 

 second palatial ones seem to be obsolete. 



The P. cheilogona (regarded formerly by Mr. Lowe as ex- 

 tremely rare) is one of the most unmistakably indigenous of the 

 Madeiran Pupa?, and one which occurs only in the damp sylvan 

 districts (principally towards the north of the island) at a high 

 elevation. I have taken it abundantly at the Lombarda das 

 Vacas, the Montado dos Pecegueiros, &c, adhering to the fronds 

 of various ferns, — such as the Woodivardla radicans, the Pteris 

 arguta, Vahl., and the Allantodia axillaris, E. Br. ; and Mr. 

 Lowe also obtained it from the same localities, during our en- 

 campments there in the summer of 1855. 



Pupa vincta. 



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

 „ „ Id., Proc. Zool. Soc. Lond. 208 (1854) 

 „ „ Alb., Mat Mad. 63, t. 15. f. 25, 26 (1854) 

 „ „ Paiva, Mon. Moll. Mad. 123 (1867) 



Habitat Maderam, praesertim borealem ; ad rapes irriguas 

 aquosas, inter Marchantiam polymorpham, L., hinc inde 



congreaans. 



In the number and proportions of the plaits (the exterior 

 ventral one of which is very large, and usually quite uncon- 

 nected by a corneous callosity, or sphincter, with the angle of 

 the lip) the present Pupa is much on the same pattern as the 

 P. cheilogona ; and it is, on the average, the largest, with the 

 exception of the P. cassida, of the Madeiran members of the 

 genus. It is, however, relatively, a more apically-obtuse (or 

 less pointed) species than the P. cheilogona ; its surface is more 

 shining and less appreciably striated posteriorly, as also usually 

 of a more olivaceous (or yellowish-green) tinge and with the 



