134 UNIVALVES. NERITA. 



NERITA. tante or Hoof-Shell. 



DIVISION I. SHELL UMBILICATED. 



FAMILY l.-~With the umbilicus rather large, nearly pervious. 

 Vitellus Clouded-yellow. Rugosa Wrinkled. 



Punctata Punctured. Vittata Ribbon. 



Cruentata Red- spotted. *Pallidula Pallid. 



FAMILY 2. With the umbilicus bifid. 

 *Canrena Tabby-cat. Sulcata Grooved. 



Cancellata Latticed. Spadicea Chesnut. 



Rufa Reddish. 



FAMILY 3. With the umbilicus nearly closed by a callus, or by 



the inner lip, 



*Glaucina Livid. Albumen Liver-coloured. 



Orientalis Eastern. Mammilla Breast. 



Maroccana Wave-striped. Papilla Nipple. 



Arachnoidea Spiders-web. Melanostoma Brown-pillar. 

 Ambigua Am biguous. 



FAMILY 4. With the umbilicus toothed. 

 Fulminea Ziczag. 



DIVISION II. SHELL IMPERFORATE AND TOOTHLESS. 



FAMILY 1. Spinous. 



Corona Crowned* 



FAMILY 2. Without spines. 



Tladula Rough-ribbed. *Littoralis Strand. 



Magdalena Magdalen. *Lacustris Lake. 



Cornea Horny. *Dubia Black-mark. 



*Fluviatilis River. *Marginata Margined. 



DIVISION III. SHELL IMPERFORATE AND TOOTHED. 



FAMILY 1. W,ith the inner lip toothed. 

 Pulligera Reddish. Aculeata Spinous. 



