264 TEST ACE A ATLANTIC A. 



verse plait. It has likewise a tendency (which seems to have 

 been overlooked by Mr. Lowe) to possess a corneous sphincter 

 across its ultimate volution, commencing near the angle of 

 the outer lip and merging (as in the case of the L. cylichna, 

 where however it is much more expressed), in an unbroken 

 curve, into the columella. 



This callosity is usually very faint, and often (as in the 

 type from which Mr. Lowe's original diagnosis was compiled) 

 obsolete ; but it is sometimes exceedingly apparent, and occa- 

 sionally indeed so much developed that it shapes out at its com- 

 mencement (near to the angle of the lip) an abrupt and almost 

 dentiform subvertical process. Examples thus furnished might 

 well be supposed, at first sight, to belong to a separate species, 

 did they not pass into the opposite extreme of form by the closest 

 intermediate gradations. I would merely therefore record this 

 phasis of the shell as the 'var. j3. pseudopsis,' deeming it suf- 

 ficient to have called attention to the fact that it is connected 

 so intimately with the other that it seems to me quite impossible 

 to regard the two extremes as specifically distinct. 



The L. ovuliformis occurs on most of the highest moun- 

 tains of Porto Santo ; but I think that I have myself usually 

 met with it more abundantly on the Pico de Facho than 

 elsewhere, which indeed was the locality in which Mr. Lowe's 

 original types were obtained. In a subfossil condition it is 

 decidedly scarce, but I have taken it sparingly at the Zimbral 

 d'Areia. 



Lovea cylichna, 



Achatina cylichna, Lowe, Ann. Nat. Hist. ix. 119 (1852) 

 Id., Proc. Zool. Soc. Lond. 206 (1854) 



Glandina cylichna, Alb., Mai. Mad. 84. t. 17. f. 19, 20 

 (1854) 



Achatina cylichna, Paiva, Mon. Moll. Mad. 116 (1866) 



Habitat Maderam, hodie non observata ; in statu semifos- 

 sili ad Canical abundans. 



This little Lovea, which has been found hitherto only in a 

 subfossil state at Canipal in Madeira proper, is certainly the 

 most remarkable of all the species here enumerated, and one 

 which in the development of the teeth and plaits of its aper- 

 ture, no less than in the obtuseness of its outline, makes 

 such a manifest approach to the Pupce that it might almost 

 seem to merit generic (and not merely sectional) separation, 

 did not the L. ovuliformis, which is more evidently on the 

 Lovea pattern, and which possesses a prominent ventral plait 

 (though, at the same time, no indication of palatial ones) 

 tend to connect it with the ordinary type. 



