3o; 



Shell Life 



long, and has no cerata ; but the sides of the 

 body are expanded into wings in which there are 

 branches of the liver. The foot is narrow, as in 

 Aplysia, in order to fit it for climbing slender stems, 

 and the side expansions are sometimes folded up 

 over the body. Normally this species is green — 

 either a bright green or dull olive — but in some 

 examples the colour varies to reddish brown. These 

 darker varieties are found alona; the shore 

 f ■•la\ ^^^ shallow water creeping over seaweeds of 

 Ik'i'liil similar hue. 



The Black Limapontia (Limapontia 

 capitatu) is another leech-like slug, and 

 although it is less than a quarter of an 

 inch in length, its dark hue makes it toler- 

 ably distinct against the bright green of 

 the finer weeds in the half-tide pools where 

 it is found. The head looks as though it 

 had been cut short in front. The eyes are 

 placed on ridges, and there are no tentacles, 

 neither are there any cerata. There is one 

 other British species, the Flat Limapontia 

 (L. dcpvessa), which is much larger and 

 more depressed. 

 The Ridged Acteon {Actcaonia comigata) is some- 

 what similar to the Limapontias, but the head is 

 adorned by a pair of conical tentacles, behind which 

 are the eyes, and from which proceed the side ridges 

 indicated in the names. 



The Falmouth Sea-slug (Cenia cocksii) is so-called 

 because it was first discovered at Falmouth by Mr. 

 W. P. Cocks, and in selecting names for it Messrs. 

 Alder and Hancock contrived to immortalise both the 



