24 ARIONIDA. 
A curious habit of this species is to sway from side to 
side when irritated. It is a ludicrous sight to see half-a- 
dozen of the creatures wagging together. 
It must be remembered that the eight following varietal 
forms are by no means all the differently coloured varieties 
met with. What used to be called the variety padlescens 
(white body and mantle, blue tentacles, and a yellow or 
orange fringe), 1s now considered an approach to the 
perfectly white form, which I have never seen. On the 
north coast of Ireland I once found an individual of a 
brilliant salmon-pink colour, and in South Devon I found 
another of the same beautiful colour; both were very 
young specimens. 
Var. I. rif (Zin.). Unicolourous red or brownish. 
Var. II. drzinnea (Roed.). Colour of burnt-sienna. 
Var. III. plimbea (Roeb.). Uniform pale lead colour. 
Var. IV. reticulata (Roeb.). Skin with the groove 
between the rugosities darker than the rugosities them- 
selves, so as to present a reticulated appearance. 
Var. V. bicolor (Roeb.). Back brown, sides primrose- 
yellow, colours sharply defined ; /r7mge orange. 
Var. VI. szwdmmerdimit (Kal.). Black, foot-fringe 
yellowish or orange. 
Var. VII. dlbolaterdlis (Roeb.). Black above, sides 
and foot white, colours sharply defined ; /rzzge orange. 
Var. VIII. dba (Lin.). Entirely white. 
