518 



GEOGRAPHICAL ZOOLOGY. 



[I'AUT IV. 



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

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

 and Oriental regions. 



Family 25.— LIMNiEID^E. (7 Genera, 332 Species.) 



Genekal Distribution. 



NEHTROflCAL 



Sub-regions. 



Neakctic 

 Sub-regions. 



PxL.eAR(:TIC 

 SUB-KEGIOX.S. 



Ethiopian 

 Sru-RKoioNS. 



Orikntal 

 sub-kegion's. 



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 : — 



Limncca (95 sp.), Nearctic, Pala^arctic, and Oriental regions; 

 Choanomphalos (2 sp.), Lake Baikal ; Pompholyx (2 sp.), Western 

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

 Nearctic, Palaearctic, Ethiopian and Oriental regions, and extends 

 to above 73° North Latitude in Siberia, being the most Arctic of 

 land or fresh-water sliells ; Ancylus (49 sp.), Nearctic and 

 Neotropical regions, Europe and New Zealand; Plano7-his (14:5 

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

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

 formations. 



Family 26.— AUPtlCULID^. (3 Genera, 210 Species.) 



The Auriculidffi are chiefly found near the sea in hot countries 

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



