THE MOLLUSCA. 129 



to identify with certainty. Were named for me by our 

 great authority, Mr. Jeffries. 



NATICID.*. 



Natica monilifera. Common. A handsome shell, being glob- 

 ular in shape, highly polished, and ornamented with a 

 spiral band of brown spots. 



Natica nitida. Not common. Similar to N. monilifera, but 

 smaller, about a quarter of an inch in diameter, and not 

 quite so globular, the spiral a little more produced. 



MURICIDjE. 



Murex erinaceus (Sting Winkle). Not uncommon, though 

 generally rather small. 



Nassa incrassata (Dog Whelk). Rare, though common as a 

 British species. In shape it is similar to the common 

 whelk, about half an inch long, with thick longitudinal 

 ribs. 



Purpura lapillus. Not common. Being naturally an inhabit- 

 ant of rocky localities, the specimens are often much worn 

 when they arrive upon the Southport shore. It is fusiform 

 in shape, very solid, and about an inch long. The animal 

 secretes a milky fluid, which in former times was used in 

 the production of a rich purple dye. 



Buccinum undatum (Common Whelk). Moderately plentiful ; 

 very fine specimens may sometimes be found after storms. 

 This is a common shell all round the British coasts. In 

 many parts it is taken in great numbers, and used for 

 bait ; and quantities are sent to the London markets, 

 where they are boiled and eaten. 



FUSHS Islandicus. Very rare : generally weather-worn. 



