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 Trumpet- shell. 



DIVISION I. SHELL SPINOUS, WITH A PRODUCED BEAK. 



FAMILY 1. With three varices. 

 Tribulus Thorny Woodcock. Scolopax Thornfy Snipe. 



Motacilla Nightingal 



FAMILY 2. With seven varices. 

 Cornutus Horned Snipe. Brandaris Short-beak' d Snipe. 



DIVISION II. SHELL WITH A PRODUCED BEAK SIMILAR TO 



THE FIRST DIVISION, BUT NOT SPINOUS. 



Haustellum Snipe. Spirillus 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. 



Rota Wheel. Radix Root. 



Saxatilis Endive. Melanomathos Black-spined. 



Trunculus Tyrian-dye. Lamellosus Lamellar. 



Rosarium Rosary. Clathratus Ribbed. 



Pomum Apple-shap'd. *Erinaceus Rough-ridg'd. 



Regius Royal. Scala Ladder. 



DIVISION IV. SHELL WITH THICK PROTUBERANT ROUNDED 

 VARICES. 



FAMILY 1. With two opposite varices. 

 R ana Frog. Crassus Thick-frog. 



