MnDichester Memoirs, Vol. liii. (1908), No. 4. J 



out to me that the suckers of each arm were arranged in 

 two rows, as in the genus Octopus, and not in a single row 

 as in Eledone. The general appearance of the animal, 

 however, was distinctly that of Eledone. An examination 

 of the radula of this specimen, and a comparison of it 

 with those of an undoubted Eledone and Octopus-., proved 

 conclusively that it was Eledone as originally supposed. 

 The comparative size, form, and arrangement of the teeth 

 of the radula of Eledone (from the specimen with two 

 rows of suckers) and of Octopus is shown in Figs. 5-6. 

 Their size, form, and arrangement in the normal Eledone 

 examined is identical with that found in the abnormal 

 specimen ; also the smooth margin of the ribband is very 

 much wider in the two specimens of Eledone than it is in 

 Octopus. 



The arrangement of the suckers on one arm (the 

 right one of the ventral pair) of each of the same three 

 specimens is shown in Figs. 1-3. The slight irregularities 

 in the arrangement of the suckers of the Octopus have been 

 somewhat exaggerated ; it will be seen, however, that 

 they form two very distinct rows. In the abnormal 

 Eledone the distinctness of the rows is not so marked, 

 though it is more marked in the actual specimen in which 

 the suckers are closely crowded together, than in the 

 figure which is somewhat diagrammatic and shows them a 

 little more spread out ; the distinctness of the two rows 

 is most marked towards the end of the arm. In the 

 normal Eledone there is a single row of suckers arranged 

 here and there in a zig-zag manner so as to form two 

 rows ; in the few specimens I have examined I have been 

 unable to find any arm in which the single row of suckers 

 was not interrupted in this way at intervals. Mr. Chad- 

 wick, however, in a letter to me in connection with this 

 enquiry says : " This morning I have examined all our 



