518 
GEOGRAPHICAL ZOOLOGY. 
[PART IV. 
Oncidium (16 sp.), South Europe (1 sp. British), Mauritius, 
Australia and Pacific Islands; Vaginulus (20 sp.), Neotropical 
and Oriental regions. 
Family 25.— LIMNAEIDiE. (7 Genera, 332 Species.) 
General Distribution. 
Neotropical 
Sub-regions. 
Nearctic 
Sub-regions. 
PaLjEARCTIC 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub-regions. 
Australian 
Sub-regions. 
1 . 2 . 3 . 4 
1 . 2 . 3.4 
1 . 2 . 3 .4 
3 — | 
1 . 2 . 3 .4 
— 
The Limnseidse, or Fresh-water Snails, inhabit ponds and 
rivers in most parts of the world, but appear to be absent from 
the Australian region. The genera are distributed as follows :■ — 
Limncea (95 sp.), Nearctic, Palsearctic, and Oriental regions ; 
Choanomphalos (2 sp.), Lake Baikal ; Pompholyx (2 sp.), Western 
America; CMlinia (18 sp.), South America; Physa (20 sp.), 
Nearctic, Palsearctic, Ethiopian and Oriental regions, and extends 
to above 73° North Latitude in Siberia, being the most Arctic of 
land or fresh-water shells; Ancylus (49 sp.), Nearctic and 
Neotropical regions, Europe and New Zealand; Planorbis (145 
sp.), Nearctic, Palsearctic and Oriental regions. Several genera 
are found fossil, chiefly in the Wealden, Eocene, and Miocene 
formations. 
Family 26. — AUBICULIDiE. (3 Genera, 210 Species.) 
General Distribution. 
Neotropical 
Sub-regions. 
Nearctic 
Sub-regions. 
Pal^; ARCTIC 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub- regions. 
Australian 
Sub-regions. 
1 4 
1 . 2 . 3. 4 
1 
1 
j 1 . 2 . 3 - 
1 . 2 . 3.4 
1 . 2-4 
The Auriculidae are chiefly found near the sea in hot countries, 
and are most abundant in the Eastern tropics. They are absent 
