8 Gravely, N'o/es on the Spaivning of Eledone. 



preserved specimens, and have found three in which the 

 arrangement of the suckers agrees exactly with that in 

 my specimen of E. inoscJiata " — a specimen from Naples 

 of which he says: "The suckers on all its arms are in a 

 single straight row from base to tip, and there is no sign 

 of a zig-zag arrangement." He adds, " In three others 

 the uniserial arrangement extends but a short distance 

 from the mouth, and is replaced by the zig-zag arrange- 

 ment which extends to the tip of the arm. The suckers 

 of our two living specimens are so arranged. When the 

 arm is strongly contracted they do not become biserial 

 like the undoubted Octopus, nor do they become strictly 

 uniserial like those of the undoubted Eledotie when the 

 arm is extended to its fullest capacity." Of these two 

 living specimens, one is that of which the spawning is 

 described above. Mr. Chadwick has sent me a diagram 

 of the arrangement of the suckers on the basal portion of 

 its arms, and with his permission I reproduce it here 

 {Fig. 4). He says of it, "The alternating arrangement 

 of the suckers begins about the point at which the arm 

 becomes free from the interbrachial web, but it is much 

 less apparent when the arms are fully extended. I should 

 call it a single alternating row." This description would 

 probably also apply to the abnormal form, except that 

 as will be seen by reference to Fig. i, the alternation 

 extends right to the base of the arm. 



A careful examination of an arm of Octopus, especially 

 of the distal portion, shows that its two rows of suckers 

 are simply an exaggerated form of this condition ; for their 

 peduncles present the appearance of a single row of 

 which alternate members extend in opposite directions, 

 and are held in this position by having partially 

 fused with that portion of the arm across which they 

 extend. 



