10 



On the head there is a single pair of these cirri, 

 which remind one of slight horns, over the eyes (PL I, 

 &g. 1, I. (I.e.), and down the back there are about seven 

 rather irregular rows of five or six papillae. However, 

 when Eledone is agitated or moving about, the skin 

 appears to become tightened over the surface of the body, 

 and this stretching causes the granules and cirri to flatten 

 down, and become indistinguishable from the rest of the 

 surface. After a short period of rest, the slackening of 

 the skin causes the granules and cirri to reappear. These 

 processes are not visible after death, and so a true idea 

 of the skin of Eledone can only be gained by watching the 

 living animal. 



The colouration of the body is due to the 

 chromatophores which lie in the dermis, and are only 

 absent from (1) the oral surface of the web, and (2) the 

 suckers and the oral surface of (he basal parts of the 

 arms. Hencv these parts are white, but when the web is 

 stretched open, the chromatophores on its aboral side may 

 be seen through as greenish dots, by transparency. The 

 following notes were made as to the colouration of 

 Eledones kept in the tanks of the Plymouth aquarium, 

 when undisturbed : — 



1. Lower or ventral aboral surface of web light buff, 

 with a pale green metallic tinge. 



'J. Dorsal aboral surface of web buff mainly, with 

 Hecks of cream scattered in between the predominating 

 patches of buff; aboral surface of arms similar. 



; !. Funnel light and practically colourless 

 posteriorly, with yellowish-brown colouration anteriorly. 

 The colour is deeper on the dorsal than on the ventral 

 surface of the funnel, where there is also some indication 

 of the metallic screen tinge which is Found on the ventral 

 surface of the web, and of the mantle sac. 



