272 FERUSSACIA, MADEIRA. 



expressed and rather further removed from the angle of the lip, 

 and the inner medial tubercle not altogether obsolete it being, 

 although indistinct, quite appreciable. These varieties, how- 

 ever, pass gradually into each other, and are of too trifling im- 

 portance to need separate subspecific titles, ' ' ( Wollaston. ) 



Var. GRABHAMI Pilsbry, n. v. PL 40, figs. 33, 34. 



The shell resembles the small form of tornatellina in shape; 

 but the very thick outer lip is inflexed, with an inwardly pro- 

 jecting lobe below the middle; supraparietal plait short and 

 narrow ; parietal nodule low but distinct. Length about 6, 

 diam. 2.8 mm. 



Madeira: Ponta Sao Lourengo, fossil (M. Grabham). 



Six examples taken by Mr. Grabham agree in the remarkable 

 development of the lip. It is a phylogerontic form, doubtless 

 extinct, and probably very local, since it does not seem to have 

 been found by former naturalists. 



65. F. MITRIFORMIS (Lowe). PI. 38, figs. 13, 14. 



Similar to F. tornatellina minor, from which it differs by the 

 more slender shape, slightly more produced spire and the 

 shorter, tooth-like supraparietal prominence. There are usually 

 a couple of very low nodules within the outer lip, opposite the 

 supraparietal tooth. Length 8.5, diam. 3.1, length aperture 

 4.9 mm. 



Madeira, the Desertas, and Porto Santo on the Pico Branco; 

 fossil on the Southern Deserta. 



Achatina mitriformis LOWE, Ann. and Mag. Nat. Hist. (2 

 Ser.), ix, 1852, p. 120; P. Z. S. London 1854, p. 203. Lovea 

 m., WOLLASTON, Test. Atlant. p. 260. 



Some examples are shorter than that figured, yet still dis- 

 tinguishable from tornatellina by the short, tooth-like supra- 

 parietal plait. 



Section FUSILLUS Lowe. 



Fusillus LOWE, Ann. Mag. Nat. Hist. (2), ix, 1852, p. 120 

 (for A. oryza, tuberculata, terebella)', P. Z. S., 1854, p. 204, type 

 A. oryza. Alsobia BOURGUIGNAT, Rev. et Mag. Zool., 1858, pp. 

 530, 535, type and sole species A. paroliniana W. et B. 

 Agraulina Bgt. (in part), t. c., pp. 530, 537. 



