474 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
During the night Hledones will sometimes escape by 
climbing over the walls, if in an uncovered tank. 
The shape of the visceral dome varies considerably. 
When resting, the body is shortish, and forms a bluntly 
rounded stout sac, and the arms may be coiled up or 
stretched out, and are often waved gently about; while at 
other times they are passed over the surface of the body, 
seeming to brush it, or are passed down into the mantle 
cavity and then out again. When swimming, however, 
the shape of the body alters. It becomes stretched out 
antero-posteriorly, and so assumes a form very like that 
of Sepza, while a lateral fold of skin becomes prominent, 
which marks off the dorsa! from the ventral surface, and 
forms a delicate fin, very similar again to that found in 
Sepia. Wave-like undulations, beginning at the front 
and passing backward, pass along this temporary 
balancing organ, which helps to support the body. With 
the return to rest or creeping the fin is lost again, 
becoming indistinguishable from the general body 
surface. Also when swimming, a longitudinal median 
depression on the ventral surface of the mantle indicates 
the line of insertion of the vertical septum, on its inner 
surface. 
Eledone is often found in the morning adhering 
halfway up the glass front of the tank, nearest the light. 
At other times it hides in dark corners, and if stones are 
provided, will heap these into a rough mound in a 
corner of the tank and hide behind this. It was, no 
doubt, this desire for dim seclusion that often led one to 
rest with the cephalopedal mass inside a jam jar, which 
was in one corner ot the tank. Hledone, apparently, 
dislikes a strong light, in which it seems quite incapable 
of opening its eyes. If a hght is brought near during 
the night, the eye contracts and the animal retreats. 
