FERUSSACIA, MADEIRA. 271 



edge blunt, interior calloused. The parietal callus is moder- 

 ately thick, and bears a vertical white ridge above (supraparietal 

 lamella); below the lower end of this and more immersed, there 

 is the weak blunt rudiment of a parietal lamella. The short 

 white columella projects as a strong lobe, entering spirally and 

 subhorizontally. 



Length 9, diam. 4. aperture 6 mm. 



Length 6.5, diam. 3 mm. (Pt. Sao Louren^-o). 



Madeira: common almost everywhere; also on the Southern 

 and Grand Desertas and on the Pico Branco in Porto Santo. 

 Fossil at Caniyal. 



Helix tornatellina LOWE, Trans. Camb. Philos. Soc. iv, 1831, 

 p. 59, pi. 6, f. 23. Achatina t., PFR., Monogr. ii, p. 277; 

 Conchyl. Cab. p. 373, pi. 37, f. 34, 35. Glandinat., ALBERS, 

 Moll. Mader. p. 58, pi. 15, f. 11, 12 (1854). Lovea t., WAT- 

 SON, P. Z. S., 1875, p. 680, 678, figs. 1-5 (living animal, jaw 

 and teeth). WOLLASTON, Testacea Atlant., p. 258. 



Closely related to melampoides, but smaller, with more oblique 

 outer lip as seen in profile, and with a well-developed supra- 

 parietal lamina. It has also more whorls. Figures 3, 4, repre- 

 sent the var. minor of Wollaston, from Pt. Sao Lourenco, 

 length about 6.5 mm. 



Wollaston recognizes three forms: "(a), major [Atypical 

 tornatellina] is found principally in sylvan districts at compara- 

 tively high elevation in Madeira, rather large, ventricose and 

 highly colored, with the subvertical ventral plait elongate and 

 narrow, and the columella a good deal (and abruptly) expanded 

 at the base; the second, (3 [minor], which is also common in 

 Madeira proper, but is more particularly characteristic of the 

 exposed submaritime cliffs, is, on the average, smaller, and not 

 quite so rounded, generally a trifle paler in hue with the sub- 

 vertical ventral plait a little shorter and more dentiform (or 

 more abruptly terminated behind), and with the columella not 

 quite so broad; whilst the third -y [intermedia], which is met 

 with sparingly on the two Southern Desertas and on the sum- 

 mit of Pico Branco in Porto Santo, is somewhat intermediate in 

 stature between the 'a' and '/?', and has the subvertical ven- 

 tral plait (although scarcely dentiform as in the (' 8 ') distinctly 



