ciiAr. xxii.] 
MOLLUSCA. 
507 
Class.— GASTEROPODA. 
Order L— PRO SO BRANCH 1 A TA. 
Family 1. — STBOMBIDaE. (4 Genera, 86 Species.) 
Distribution. — The Strombidae, or Wing-shells, inhabit tropi- 
cal and warm seas from the Mediterranean to New Zealand ; most 
abundant in the Indian and Pacific Oceans. There are nearly 
200 fossil species, from the Lias to Miocene and recent deposits. 
Family 2 — MURICID^E. (12 Genera, 1000 Species.) 
Distribution. — All seas, most abundant in the Tropics. 
Trichotropis is confined to Northern seas ; Mnrex and Fusus are 
cosmopolitan. There are about 700 fossil species, ranging from 
the Oolite to the Miocene and recent formations. 
Family 3.— BUCCINID^E. (24 Genera, 1100 Species.) 
Distribution. — The Buccinidie, or “ Whelks/’ range over the 
whole world, but some of the genera are restricted. Buccinum 
inhabits the north and south temperate seas; Monoceros the 
West Coast of America ; Cassidaria the Mediterranean ; PJios, 
Ilarpa, Eburna, and Ricinula , are confined to the Pacific ; Fol- 
ium inhabits the Mediterranean as well as the Pacific. There 
are about 350 fossil species, mostly from the Eocene and Miocene 
beds. * 
