GASTEROPODA. 307 
Animal with clavate tentacles; sole of the foot divided by a 
longitudinal groove, the side moved, alternately in walking; 
the end of the long muzzle is also frequently appiied, as by the 
looping-snails (‘Truncatellze), and used to assist in climbing. 
Distribution, above 160 species. South Europe; Africa, 
Madagascar. The only British species, C. elegans, is found on 
calcareous soils; it ranges to the Canaries and Algeria, and 
occurs fossil in the newer Tertiaries. Nearly half the species 
have the whorls spirally keeled, and have been distinguished 
under the name Tropidophora by Troschel. They are found 
in Madagascar and the adjacent islands and coast of Africa. 
Fossil, 40 species. Hocene, Kurope. 
Sub-genera. Otopoma, foliaceum, Gray. Shell sub-globose, 
umbilicated; peristome with an ear-like process covering part 
of the perforation. Distribution, 15 species. Arabia, Mada- 
gascar, China, New Ireland. 
Choanopoma, lincina, Pfeiffer. Shell often a little decollated ; 
peristome usually double, the outer edge angularly expanded. 
Lincina (labeo), Br., has the last whorl produced. Jamaicia 
(anomala), C. B. Adams, has the operculum convex, Distribution, 
70 species. West Indies, and a few in Tropical America. 
Cistula (fascia), Gray. = T'udora, megacheila, Gray. Shell 
ovate or elongated, apex usually decollated, peristome free; 
operculum with a thin shelly outer coat. Chondropoma, semi- 
labre, Pfr., differs in the operculum being ‘‘ sub-cartilaginous.”’ 
Distribution, about 70 species. West Indies; Tropical America, 
8 species. 
Realia, hieroglyphica, Gray. = Hydroceena (part) Parreyss, 
Omphalotropis, Pfr. Liarea (Egea), Gray. Bourciera, helicine- 
formis, Pfr. Shell turreted or turbinate, perforated; peristome 
simple, straight or expanded; operculum pauci-spiral, horny. 
Distribution, 17 species. Canaries, ? Mauritius, Pacific Islands. 
(Ecuador, Bourciera.) 
Pomatias, maculatum, Studer. Shell slender, transversely 
striated ; peristome reflected; operculum cartilaginous, con- 
