PATELLA HUNGARIAN BONNET. 123 



PATELLA Pettudda. 

 BLUE-RAYED LIMPET 



Specific character. Shell sub-conical, thin, 

 pellucid, smooth ; summit slightly recurved, 

 lateral ; of a dusky brown colour, rayed with 

 dotted lines of the brightest azure blue, lines 

 varying in number from three to seven ; length 

 nearly an inch, breadth not quite three-quarters. 



This species is common in many parts of the 

 Cornish and Devonshire coasts ; it is never 

 found adhering to rocks, but is picked up after 

 storms, having been thrown on shore by the agi- 

 tation of the waves, along with the sea-weed to 

 which it is attached. It is found in abundance 

 at Sandwich, and always on the same plant, the 

 stalk of which the animal excavates, probably 

 for food, and forms a cell, in which are some- 

 times discovered two or three of the same species 

 together. 



PATELLA Ungarica* 



HUNGARIAN BONNET. 



Specific character. Shell conical, thin, semi- 

 transparent, finely striated longitudinally, and 

 wrinkled transversely ; summit much recurved, 



* Plate VI. figure 1. 



