540 TROCHIDiE. 



The animal is brilliantly coloured, tinted with shades of 

 purple, yellow, and often of green. The muzzle is rather 

 short, and has slightly crenated yellow-tinged lips. The 

 upper part and the head are marked with purplish brown 

 and white, the latter colour arranged in streaks. The 

 tentacula are long and of a yellowish white colour ; they 

 are strongly ciliated. The eye-peduncles are white, or 

 tinged with green. The neck lobes are prominent, some- 

 what fan-shaped, and strongly fimbriated at their mar- 

 gins. The sides of the foot are tinged or streaked with 

 purplish brown ; its sole is of a lanceolate form, rounded 

 in front and pointed behind. The lateral expansions of 

 the foot give origin to three cirrhi on each side. The 

 middle pair are usually, though not always, much smaller 

 than those in front and behind, so small sometimes as to 

 cause the animal to appear as if it had only two cirrhi on 

 each side. In an example taken in Milford Haven, 

 figured in Plate D D, the middle pair of cirrhi were 

 greatly developed, whilst in one which we observed at 

 Dartmouth they were almost obsolete, and could not be 

 seen when the creature was in motion. Mr. Alder and 

 Mr. Spence Bate have observed it with only two lateral 

 cirrhi on each side. When walking it vibrates its tenta- 

 cula, and uses them as feelers, at the same time giving its 

 shell a slight see-saw movement. 



This pretty shell is plentiful in most localities in the 

 British Channel and Irish Sea, though rare and local on the 

 eastern and northern coasts of Britain. Margate (S. H.); 

 Oban (Jeffreys). All round the coasts of Ireland (W. 

 Thompson). It ranges to the Mediterranean, but is not 

 present in seas north of our own. 



