PERUSSACIA, MADEIRA. 275 



68. F. PRODUCTA (Lowe). PI. 39, figs. 24, 25. 



"Related to Achatina aticula Mull., but the shell is double 

 the size, more solid and robust, with an entirely different ap- 

 pearance. It differs from A. gracilis Lowe by the more solid 

 shell, not hyaline, the aperture obliquely produced backward 

 and narrowed upwards, the columella prominently, distinctly 

 truncate or emarginate at base 1 ' (Lowe, 1852). 



Shell rather large, somewhat strong, subpellucid, turrite, sub- 

 cylindric-subulate, slender, long; spire produced. Whorls 8, 

 quite flat; suture rather indistinct, oblique. Apeiture narrowly 

 elliptical, narrowly acuminate above, and obliquely produced 

 backward, linear, coarctate, about as long as the spire. Peri- 

 stome margined within or with an opaque ochrey thickening, 

 inner lip arcuately projecting in the middle. Columella short, 

 at the base with an abruptly truncate twisted projection. 

 Length 8.5, diam. 2.5, aperture 4.12 mm. (Lowe, 1854). 



Madeiran archipelago: Southern Deserta, very rare among 

 plants and stones (Lowe, Wollaston). 



Achatina producta LOWE, Ann. and Mag. Nat. Hist. (2 ser. ), 

 ix, p. 120 (Feb., 1852); P. Z. S., 1854, p. 202. Loveap., WOL- 

 LASTON, Testae. Atlant., p. 261. 



This species resembles F. mitriformis and its allies by the for- 

 wardly descending lip and very narrow posterior part of the 

 aperture, but it differs in having a thin outer lip, and the pari- 

 etal wall is without calluses of any kind. The specimen illus- 

 trated, from the Wollaston collection, measures, length 7, diam. 

 2.4, aperture 4 rnm. long. It may not be fully adult, for the 

 outer lip has not the internal thickening mentioned by Lowe. 



69. F. IRIDESCENS (Wollaston). 



"Shell rather narrow, cylindric-subulate, fragile, subpellucid, 

 with an iridescent luster; spire produced. Whorls a little con- 

 vex, suture distinct, oblique. Aperture narrow, attenuate and 

 obliquely produced backward above, wholly toothless. Peris- 

 tome thin, acute, the right lip rather straightened; columella 

 short, arcuate, somewhat twisted, somewhat expanded, but a 

 little prominent at the base. Length scarcely 3 lines" 

 laston}. 



