106 UNIVALVES. — MUREX. 



Erythrinus — Nodulous. Samar — Samar. 



Dentatus — Toothed. 



Division IV. — Shell turreted, with a longitudinal 



FISSURE EXTENDING FROM THE APERTURE 

 TO THE SUMMIT. 



Fissus — Slit. Fissurella — Fissure. 



Division V. — Shell turreted, with a very long spire. 



Family 1. — The aperture ending in a long beak, and the outer 



lip toothed. 

 Fusiis — Spindle. Unicornis — Unicorn. 



Family 2. — Without the beak, and the aperture not toothed. 

 Tuberculatus — Tuberculated. Auritus — Eared. 

 Faiustris— Marsh. Lividus — Livid. 



Ater — Black. *Costatus — Ribbed. 



Division VI. — Shell obovate, with transverse nodu- 

 lous belts, pillar-lip granulated, and the outer 

 lip thickened and toothed within. 

 Onlscus — Wood'louse. 



MUREX. — Rock or Trumpet-Shell. 



uinimnl — a Limax: Shell imivalve, spiral, rough, with 

 memhranaceous sutures ; aperture oval, ending in an en- 

 tire, straight, or slightly asce?iding canal. 

 THE most prominent character which distinguishes the 

 one hundred and seventy-two species of the Murex from 

 those of the two preceding genera, consists in the beak, 

 which inclines neither to the right nor left, but is almost 

 invariably straight and very much produced, sometimes 

 turning a little upwards. 



