124 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 



EXPLANATION OF PLATES. 



PLATE IV. 



Fig. \. Octopus ])!inctatus Gabb. ]\Ialc. Dorsal view, from an alcoholic specimen, 

 somewhat restored. T?"duced to one fourth natural size. 



PLATE V. 



Fig. L Octopus biiudculatus Verrill. INIale. Side view. One half natural size. 

 Somewhat restored from an alcoliDlie specimen. 



" la. Tiie same. Ileetocotylized arm. Side view, showing the marginal groove 

 spread open and the very small terminal organ. Enlarged two diam- 

 eters. 



" 2. tfcto/iHs punctiUtis Ga))b. Distal i)ortion of the hectocot^dized arm, front 

 view, ,'iiiowing the terminal organ, spread open, and the commencement 

 of the marginal groove, with a few of the distal suckers. Enlarged two 

 diameters. 



PLATE VI. 



Fig. 1. Octopus hiiiiaciilatH.-^YorYiU. ^iale. Front view of the inner surface of the 

 wel) and arms, showing the entire length of the riglit arm of the second 

 and third pairs, and the basal i>ortion of the other arms. To illustrate 

 particularly the great size of certain suckers of the lateral arms. 



