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— LIMNvEIDiE. (7 Genera, 332 Species.) 



General Distribution. 



The Limnaeidse, 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; Chilinia (18 sp.), South America; Physa (20 sp.), 

 Nearctic, Paleearctic, 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; Planorlis (145 

 sp.), Nearctic, Palsearctic and Oriental regions. Several genera 

 are found fossil, chiefly in the Wealden, Eocene, and Miocene 

 formations. 



Family 26.— AUPJCULID.E. (3 Genera, 210 Species.) 



General Distribution. 



The Auriculidse are chiefly found near the sea in hot countries 

 and are most abundant in the Eastern tropics. They are absent 



