518 



GEOGRAPHICAL ZOOLOGY. 



[fart IV. 



Oncidium (16 sp.), South Europe (1 sp. British), Mauritius, 

 Australia and Pacific Islands ; Vaginulus (20 sp.), Neotropical 

 and Oriental regions. 



Family 25.— LIMN^IDrE. (7 Genera, 332 Species.) 



General Distribution. 



Neotropical Nearctu; 

 Sub-regions. Sub-reoions. 



Pal.earctic 

 sub-heoions. 



Ethiopian 

 sub-reqio.ns. 



Oriental Australian 

 Sub-regions. Sib-regions. 



1.2.3.4 



1.2.3.4 



1.2.3.4 



3 - 



1.2.3.4 



The Limna?idie, or Fresh-water Snails, inhabit ponds and 

 rivers in most parts of the world, hut appear to be absent from 

 the Australian region. The genera are distributed as follows : — 



Limnwa (95 sp.), Nearctic, Patearctic, and Oriental regions ; 

 Choanoviphalos (2 sp.). Lake Baikal ; Pomphohjx (2 sp.). Western 

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

 Nearctic, Palasarctic, 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 ; Planorhis (145 

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

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

 formations. 



Family 26.— AURICULIDiE. (3 Genera, 210 Species.) 



The Auriculidffi are chiefly found near the sea in Lot countries, 

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



