it; 



definitely marked off, hut merge gradually into one 

 another. When touched with the hand, the body feel* 

 soli and slimy and of about the consistency of a firm jelly. 

 The flesh retains its elasticity for some hours after death. 

 The following are the dimensions of a probably full-grown 

 Eledone, immediately after death: — 



Length of arm ... ... ... ... 360mm. 



Length of visceral dome ... ... l(i() mm. 



Length of head ... ... ... 38mm. 



Total length ... ... ... ... 55S mm. 



Width of head . . ... ... ... 75 mm. 



Width of body at widest part ... 140mm. 



(Aj Cephalopedal Mass. This mass, which forms the 

 greater part of the body of Eledone, as regards length, 

 consists, as the name implies, of the head and foot. 



(1) Head — The head is a solid oval mass, behind the 

 arms and anterior to the visceral dome. The anterior part 

 or buccal mass is hidden away inside the bases of the 

 arms, and hence only the posterior portion shows 

 externally. Laterally it bears the eyes, while the central 

 portion consists of the muscles which cover the brain 

 cartilage, ventrally and dorsally. To the ventral surface 

 of the head is attached the tunnel (PI. Ill, fig. 11, F.). 



Cephalic Cartilage, it is convenient to describe the 

 structure of the Cephalic and Orbital Cartilage here. 

 They are both built up of oval cells surrounded by a clear 

 matrix (PI. VI, fig. 66a, ('. red and Matr.). These cells 

 have large oval nuclei, and are connected by fine 

 cytoplasmic processes one with another. Hence the 

 spaces occupied by the cartilage cells also intercommuni- 

 cate by canals down which these cell processes run. 



(2) The Foot is divided into eighl equal muscular 

 processes, or arms. In the female these are all similar, 

 but in the male the third rifflrl arm is hectocotvlised 



