19 



4, Neritoides. 



Littorina neritoides, Fer. — Nerita littoralis,. 

 {Lin. f) Mont. — Turbo retusus and neri- 

 toides, Lam. — Neritoides littoralis, Brown. 

 Animal generally entirely yellow, sometimes with 

 the head, tentacula, and edge of the mantle black. 

 On stones and wrack at low water, common. 



XXXII. Lacuna, Turton. 



1. pallidula. 



Lacuna pallidula, Turton. — Nerita pallidula, 

 Mont. — Natica pallidula, Flem. — Turbo 

 pallidulus, Turt. (Conch. Diet.) 

 Animal milk-white. 

 On the north coast, frequent : on fuci at low water, 



2. puteola. 



Lacuna puteolus, Turt. — Helix lacuna, var. 

 Mont. — Turbo puteolus, Turt. (Conch. 

 Diet.) 

 Among sand in Douglas Bay, not uncommon. 



3. quadrifasciata. 



Lacuna quadrifasciata, Turt, — Turbo quad- 

 rifasciatus, Mont. 

 On fuci at low water, rare. North coast. 



XXXIII. Skenea, i^/m. 

 1. depressa. 



Skenea depressa, Flem. — Helix depressa. 



