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of this peninsula, Monte Cofano, a species with percostate shell,
C. crassicostata (fig. 6), occurs. This sculpture, which is found also in certain Albinaria species and other rock­dwelling
clausiliids of meridional Europe, may be another adaptation to a life in open rock habitats.
The occurrences of Siciliaria (S.) species on the Egadi islands are of special interest. On Marettimo, only S. scarificata
occurs. This endemic species is closely related to the other species of the grohmanniana group distributed in the east,
not to the neighbouring ones of the nobilis­calcarae group. On Favignana, originally only S. calcarae occurred. C.
crassicostata, which has been collected by several authors on the island (e. g., by Brandt on garden walls, fig. 6) has
obviously been introduced (by man?) from Monte Cofano nearby.

Figs. 1­7. Siciliaria (S.) spp., with clausilium plates.

Frontal view, body whorl dorsal view and oblique view into aperture, to make visible the clausilium
plate. Actual shell height = H (mm). Phot. S. Hof.