508 
GEOGRAPHICAL ZOOLOGY. 
[part IV. 
Family 4. — CONID-E. (3 Genera, 850 Species.) 
Distribution. — The Cones are universally distributed, but 
this applies only to the genus Pleurotoma. Conus is tropical 
and sub-tropical, and Githara is confined to the Philippine 
Islands. There are about 460 fossil species, from the Chalk 
formation to the most recent deposits. 
Family 5.—' VOLUTIDJE, (5 Genera, 670 Species.) 
Distribution.— The Volutes are mostly tropical; but a small 
species of Mitra is found at Greenland, and a Marginella in the 
Mediterranean. Cyrtiba is confined to the West Coast of Africa 
and Portugal. Voluta extends south to Cape Horn. There are 
about 200 fossil species, from the Chalk and Eocene to recent 
formations. 
Family 6.— CYPEEIDE. (3 Genera, 200 Species.) 
Distribution.- — The well-known Dowries are found all over 
the world, but they are much more abundant in warm regions. 
One small species extends to Greenland. There are nearly 100 
fossil species, from the Chalk to the Miocene and recent forma- 
tions. 
Family 7. — NATICIDE. (5 Genera, 270 species.) 
Distribution. — The Naticidse, or Sea-snails, though v most 
abundant in the Tropics, are found also in temperate seas, and 
far into the Arctic regions. Two other genera are fossil ; and 
there are about 300 extinct species, ranging from the Devonian 
to the Pliocene formations. 
