60 THE LIFE OF THE MOLLUSCA 
Philippines at a distance of a quarter of a mile from 
any water. The freshwater Ampullaria has been 
said to have been met with also on a tree-top. 
Geomelania, a genus closely related to the brackish- 
water Truncaiella, is completely terrestrial. 
The true terrestrial Mollusca comprise representa- 
tives of the Rhipidoglossa in the families Despcenide, 
Helicinide, and Hydrocenide ; of the Tzenioglossa 
in the Aciculide, Pomatiide [= Cyclostomatide], 
and Cyclophoride; and of the order Pulmonata, 
certain of the Auriculide among the Basommato- 
phora, with all the Stylommatophora. 
They flourish on every portion of the habitable 
land surface from the margins of the seas to lofty 
elevations on mountain peaks, a Slug, Anadenus, 
reaching the altitude of 16,400 feet in the Himalayas ; 
while the record for farthest north for a Land Snail 
would appear to be held by Vitrina angelica, which is 
said to extend as far as latitude 72” in Greenland. 
Some, like Caciliotdes, the Corsican Helix tristis, 
and Testacella (Plate XIV.), live underground—the 
first named entirely so. Most prefer damp situations 
at the roots of plants and shrubs, under fallen wood, 
beneath stones, or in the crevices of rocks; many 
are fond at times of ascending plants and shrubs, 
and do so more often than is commonly thought; 
other kinds are entirely arboreal. A few that inhabit 
arid and hot countries can withstand the full glare 
of the sun as they rest on rocks exposed to its rays. 
In the Egyptian desert Dr. Andrews says that each 
