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CHAP. XXII.] MOLLUSCA. 521
Japan, the other half in Moluccas, New Guinea and Australia ;
Cyclotopsis (2 sp.), India and Malaya : Registoma (9 sp.), Philip-
pines and Moluccas, New Caledonia and Pacific.
Characteristic of the Neotropical region are :
—
Gyclotus (111
sp.), half in the Antilles and Tropical America, the rest in the
Moluccas, China, Malaya, India, Natal, and the Seychelle
Islands ; Megalomastoma (27 sp.), abundant in Cuba, West
Indies and South America, others in India, Malaya, and
Mauritius ; Jamaicia (2 sp.), Jamaica ; Licina (5 sp.), Antilles
Choanopoma (49 sp.), Antilles; Ctenopoma (25 sp.), Antilles;
Diplopoma (1 sp.), Cuba; Adamsiella (15 sp.), Jamaica, Cuba,
Guatemala ; Gydostomus (113 sp.), abundant in Antilles, also
occurs in Madagascar, Arabia, Syria, Hungary and New Zealand
Tudora (34 sp.), Antilles, and one species in Algeria ; Cistula
(40 sp.), Chondropoma (94 sp.), Bourcieria (2 sp.). Tropical
America.
Peculiar to or characteristic of the Palsearctic region are :
Craspedopoma (5 sp.), confined to Madeira, the Azores and
Canaries ; Leonia (1 sp.), Spain and Algeria ; Pomatias (22 sp.),
Europe and Canaries with a species in the Himalayas ; Cecina
— ;
(1 sp.), Manchuria.
The Ethiopian region has the peculiar genus Lithodion (5 sp.),
Madagascar, Socotra and Arabia; and Otopoma{\'^ sp.), Mascarene
Islands and Socotra, with a species in Western India and another
in New Ireland.
The Australian region is characterised by Callia (3 sp.), in
Ceram, Australia, and the Philippines respectively ; Realia (7
sp.). New Zealand and the Marquesas Islands ; Omphalotropis
(38 sp.), the Australian region, with some species in India,
Malaya, and the Mauritius.
The remaining genus, Hydrocena (27 sp.), has a very
widely scattered distribution, being found in South Europe,
Japan, the Cape, China, Malaya, New Zealand, the Pacific
Islands and Chili. From 10 to 20 per cent, of new species have
been since described in most of the genera of this family.