Manchester Memoirs, Vol. liii. (1908), No. 4. 9 



Dr. Hoyle has already pointed out (1886 : p. yG) that 

 in Octopus the double row of suckers is really due to the 

 zig-zag displacement of a single row, and has further (1904: 

 pp. 18-20 ; PI. 5, Figs. 3-9) described some young specimens 

 which he refers to this genus, in which the suckers appear 

 sometimes in one row and sometimes in two. 



Special interest attaches to the settlement of the 

 question of the possible occurrence of two rows of suckers 

 in Eledone, in that it may explain certain insufficiently 

 authentic records of Octopus vulgaris in ]3ritish seas, 

 further north than the northern limit of its known 

 distribution. 



In conclusion, I must thank Dr. Hoyle and Mr. 

 Chad wick for the valuable help that they have given me 

 in connection with this paper. 



