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CHAP. XXII.] MOLLUSCA. 515
Achatina (87 sp.) is most abundant and finest in the Ethio-
pian region, over the whole of which it ranges ; hut there are
also species in Florida, the Antilles, the Sandwich Islands,
Ceylon and India. The described species are now more than
doubled.
Hyalina (84 sp.) inhabits all Tropical America and the
Antilles, North America to Greenland, and Europe to the
Arctic regions. Comparatively few new species have been
described.
Cylindrella (83 sp.) inhabits the West Indian islands and
Guatemala to Texas, with a sub-genus in the Philippine Islands.
Species since described have more than trebled the number in
this genus.
Cionella (67 sp.) is widely scattered ; in India from Ceylon to
the Khasia Mountains, Brazil, New Granada, the West Indian
islands, Palsearctic, and northern part of Nearctic regions,
Pacific Islands, New Zealand, and Juan Fernandez. About 20
new species have since been described.
Glandina (66 sp.), Peru to South Carolina and the Antilles,
with three species in Central Africa and one in South Europe.
About 40 species have been added to this genus.
Stenogyra (49 sp.), widely distributed : Tropical America and
West Indies to Florida, South and West Africa, the Mediterranean
region, India and the Philippines. About a dozen new
species have been described.
Succinea (41 sp.), widely scattered in all the regions, and in
St. Helena, Juan Fernandez, Tahiti, Chiloe, Greenland, West
Africa, Himalayas and Australia. The described species are
now more than 100.
Partula (39 sp.), Solomon Islands to Tahiti and Sandwich
Islands. This genus has also been increased to near 100
species.
Streptaxis (34 sp.), most abundant in Tropical South America,
but occurs in West Africa, the Seychelles and Eodriguez Islands,
Ceylon and Burmah. It now contains over 100 described species.
Spiraxis (33 sp.), Yucatan to Mexico, and less abundant in the
West Indian Islands. About 20 species have been added.