Streptaxis (34 sp.), most abundant in Tropical South America, but occurs in West Africa, the Seychelles and Rodriguez 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.
Macroceramus (27 sp.), Antilles, Florida, and Peru. The species have been more than doubled.
Vitrina (26 sp.), widely scattered through North and Central Europe, North-west America and Greenland, Abyssinia, Madagascar and South Africa, Himalayas to Burmah and Australia. Species since described have more than doubled the number in this genus.
Orthalicus (23 sp.), Bolivia to Mexico and Antilles. This genus has been increased to about 40 species.
Sagda (19 sp.), Antilles only. Very few new species, if any, have been described.
Zonites (12 sp.), South Europe, with one species of a distinct type in Guatemala. The number of species in this genus has been since about tripled.
Leucochroa (11 sp.), Mediterranean region to Syria and Arabia Petrea.
Simpulopsis (7 sp.), Bahia, Antilles, and far away in the Solomon Islands. Two or three have been added.
Balea (6 sp.), Middle and North Europe, Brazil, and the Island of Tristan d'Acunha.