UNIVALVES. — MUREX. 109 



Straits of Magellan ; the European, Northern, and Southern 

 seas; India, the Mediterranean, Adriatic, and Atlantic. 



This genus derives its name from many of its species be- 

 ing rough, like the sharp crags of a rock. 



MUREX— Rock or Trimpet-shtU. 



Division I. — Shell spinous, with a produced beak. 

 Family 1. — With three varices. 

 Tribulus — Tliornij Woodcock. Scolopax — Thorny Snipe. 

 Motacilla — Nightingale. 



Family 2. — With seven varices. 

 Coruutus — Horned Snipe. Brandaris — Short-beak'd Snipe. 



Division II. — Shell with a produced beak similar to 



THE first division, BUT NOT SPINOUS. 



HausteUum — Snipe. Splrillus — Blunt-tipped. 



Division III. — Shell foliated, with a short beak. 



Family 1. — With three varices. 

 Ramosus — Branched. Lingua — Sheep' s-tongue. 



Foliatus — Foliated. Tripterus — Subtriangular. 



Triqueter — Three-warted, 



Family 2. — With more than three varices, 



Scorpio — Scorpion. Miliaris — Scabrous. 



flot3i— Wheel. Radix— Root. 



Saxatilis — Endive. Melanomathos — Black-spined. 



Trunculus — Tyrian-dye. Lamellosus — Lamellar. 



Rosarium — Rosary. Clathratus — Ribbed. 



Pomum — Apple-shaped. *Erinaceus — Rough-ridg'd. 



Regius — Royal. ScaJa — Ladder. 



Division IV. — Shell with thick protuberant rounded 

 varices. 



Family 1, — jyith two opposite varices. 

 Raiia — Frog. Crassus — Th ick-frog. 



