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New and little known land snails from Sicily (Mollusca Gastropoda) 211

Figures 18-20. Shell (limacella) of T. marinellii n.sp., holotypus, h: 7.65 mm - D: 5.05 mm. Figure 21. Geographic
distribution of Tandonia marinellii n. sp (circles) and T. sowerbyi (squares) in Sicily (personal data). Figures 22-24.
Typus of Palizzolia monterosati (MHNG BGT 2385), h: 4.5 mm - D: 3.8 mm, thickness 2.2 mm. Figure 25. Original
label of P. monterosati (MHNG BGT 2385). Figure 26. Four sequential visions of the ampoule rotated progressively so

that to allow the overall vision of the label of P. monterosati (MHNG BGT 2385).

Giusti et al. (1995) note that Tandonia shells are for univocal taxonomic attribution. At Calatafimi,
generally thicker and oval, however examination of locus typicus of P. monterosati, we surveyed M. ni-
the Palizzolia monterosati type (MHNG BGT gricans (Philippi, 1851) and T. marinellii n. sp., but
2385) (Figs. 22-26) does not provide indications the presence of M. gagates and T. sowerbyi cannot