PERIWINKLES — WBNTLETRAP. 27 



show greater predilection for dying than for 

 mowing. The Common Periwinkle, so familiar 

 in our streets, is tolerably hardy in confinement, 

 and may be kept for some time. But the 

 handsomer Yellow Periwinkle (Littorina litto- 

 rails), which is represented on plate b, fig. 2, is 

 still more delicate in constitution, and seldom 

 survives for many weeks. But even the Common 

 Periwinkle is a pretty creature, as it exhibits 

 itself when crawling upon the glass of the aqua- 

 rium, or on the sea-weeds where it finds its food. 

 The body is prettily banded with multitudes of 

 narrow dark markings, and the mode in which 

 the creature slides itself over the glass is very 

 curious. 



There is a very pretty shell found in tolerable 

 profusion on our sands, and which will be re- 

 cognised at once from its portrait (plate b, fig. 5). 

 This is the Common Wentletrap {Scalaria com- 

 munis). It is not only a pretty shell, but holds 

 relationship with a Tery aristocratic connexion. 

 The Wentletraps are divided into two great 

 sections; the false Wentletraps, the whorls of 

 whose spires touch each other; and the true 

 Wentletraps, whose whorls are disjointed fi:om 

 each other. Of the former section our little 

 friend is a good example ; and of the latter, the 



