MADEIRAN GROUP. 245 



Porto-San tan one, — even though the latter is, so far as I can 

 recollect, a trifle more curved, or eccentric, in its general con- 

 tour than those from which the above (emended) diagnosis has 

 been compiled. 



The most important feature which separates the A. eulima 

 from the acicula consists in the presence of a conspicuous 

 medial plait on its ventral paries ; but it has other character- 

 istics also which combine to separate it from that species. Thus 

 it is not only longer, more cylindric, and proportionately still 

 slenderer, with a tendency to be obsoletely bent (as in the 

 marine genus Eulima), but its whorls (particularly the inter- 

 mediate ones) are altogether more lengthened-out and flattened ; 

 and its aperture is relatively a little shorter, as well as broader 

 (and more rounded) posteriorly, — the basal margin being more 

 obtusely arcuate, and merging almost without an intervening 

 angle into the columella, which is narrowed gradually (and is 

 not abruptly truncated) behind. The suture is exceedingly 

 oblique, and its surface is of a hyaline white. 



Not suspecting them to be otherwise than rather narrow 

 and elongated individuals of the acicula, I unfortunately made 

 no note as to the exact spot where my specimens of the 

 A. eulima were met with in Madeira proper ; but they were 

 certainly obtained by myself, and in all probability within the 

 Funchal district. The species however is manifestly rare, for I 

 find only four of them, out of nearly 90 examples of the 

 A. acicula which I have just overhauled. 



(§ Cochlicopa, Fer.) 

 Achatina lubrica. 



Helix lubrica, Mull., Verm. Hist. ii. 104 (1774) 

 Giandina lubrica, Morel., Hist. Nat. des Acor. 197 (1860) 

 „ subcylindrica, Drouet, Faun. Acor. 164 (1861) 

 Achatina lubrica, Watson, Joum. de Conch. 223 (1876) 

 var. (3. maderensis, Lowe. 



Helix lubrica, var., Lowe, Camb. Phil. 8. Trans, iv. 61. 



t. 6. f. 29 (1831) 

 Achatina lubrica, 7., Pfeiff., Mon. Hel. ii. 273 (1848) 

 Buiimus maderensis, Lowe, Ann. Nat. Hist. ix. 119 (1852) 

 Achatina maderensis, Pfeiff., Mon. Hel. iii. 504 (1853) 



„ „ Lowe, Proc. Zool. 80c. Load. 1 99 



(1854) 

 Giandina maderensis, Alb., Mai. Mad. 55. t. 14. f. 20, 21 



(1854) 

 Achatina maderensis, Paiva, Mon. Moll. Mad. 104 (1867) 



Habitat Maderam ; sub lapidibus in inferioribus inter- 



