UNIVALVES. NERITA. 



123 



Textilis— T/jrM*/». 

 Atrata — Smooth black. 

 Ascensionis — Ascension. 

 Liueata — Lined. 

 Versicolor — Square-spotted. 

 Pica — Magpie. 

 Costa ta — Ribbed, 

 Quadricolor — Four-colored. 

 Malaccensis — Malacca. 

 Antillarum — Wrinkle-lipped. 

 Flammea — Flame. 



Fulgurans — Lightni?ig. 

 Tessellata — Tessellated. 

 Bifasciata — Double- banded. 

 Literata — Charactered. 

 Violacea — Violet. 

 Senegalensis — Senegal. 

 Promontorii — Pointed. 

 Tricolor — Three-colored. 

 Perversa — Reversed. 

 Turrita — Turreted. 

 Aculeata — Spinous. 



HALIOTIS. — Sea-ear or Ear-Shell. 



Animal — a Limax: Shell imivalve, dilated, ear-shaped, 

 with a lorif/itudinal row of orifices along the surface; 

 spire lateral, and nearly concealed. 



Of this beautiful genus there are but nineteen species; 

 and their general form and appearance are so similar, that 

 it often becomes a matter of difficulty to distinguish the 

 one from the other. The form of all the Haliotides re- 

 sembles the human ear, excepting one, which iscalledthe 

 H. asinum, or ass's ear, on account of its being much more 

 elongated or distended than any of the other species. 



There are three reasons which operate to create diffi- 

 culty in the arrangement of the species of this genus: — 

 First, the outside of the shell is generally loaded with 

 marine substances, or else is so much decayed or worn, 

 as not to offer a lineament of the original texture j there- 

 by precluding all possibility of judging by the work or 



