1064 CEPHALOPODA. [Dibranchia. 



meter of largest dorsal sucker. 1-3 in. (33mm.) : diameter of largest 

 ventral sucker, 0-9 in. (23 mm.). 



Type was in the Nelson Museum, but was destroyed when the 

 Museum was burnt down some fifteen years ago. 



Hab. Blind Bay, Nelson. 



3. Polypus maorum, Hutton. 1880. 



Octopus muorutn, Hutton, M.N.Z.M., 1880, 1 ; T. J. Parker, Nature, xxxii, 

 1885, 586 ; Chall. Rep., xvi, 13, 220 ; Index, 57. 



Body oval, rounded behind, smooth below, roughened but not 

 tuberculated on the back. Head slightly granular. Arms long, 

 tapering, dorsal pair the longest, ventral pair the shortest ; web broad, 

 smooth. Cups in 2 rows, close, elevated, those of the eighth or 

 ninth rows the largest, gradually diminishing both ways ; those on 

 the dorsal arms largest, twice the diameter of those on the ventral 

 arms. Colour dark grey, paler below. (F. W. Hutton.) 



Besides the hectocotylization of the third right arm, there is a 

 striking difference between the two sexes which I have not seen men- 

 tioned. In the male the suckers simply undergo a gradual diminution 

 in size in passing from the prominal to the distal end of the arm ; 

 they retain their characteristic form, and are easily counted up to about 

 half an inch of the tip. In the female, on the other hand, the suckers 

 become quite indistinct for several inches, and in some cases for fully 

 a foot, from the extremity of the arm, taking on the form of small 

 tubercle-like elevations. As an instance of this difference I may men- 

 tion that in a male specimen with the first left arm 4 ft. 2 in. (1-284 m.) 

 in length, from 292 to 319 suckers could be readily counted on each 

 arm, while in a female with the corresponding arm of the same length 

 only 90 to 115 could be counted on each arm, the distal portions bearing 

 tubercles so crowded as to make it practically impossible to count 

 them. 



The following are the dimensions of the largest specimen (a male) 

 I have measured : Length of body and head, 1 ft. 1 in. '(330 mm.) : 

 diameter of body, 8 in. (203 mm.) : length of arms first pair, left 

 5ft. 5 in., right 5ft, Sin. (1,652-1,600 mm.) ; second pair, left 

 4ft. 10 in., right 5ft. 2 in. (1,474-1,575 mm.) ; third pair, left 4ft. 

 7 in., right 2ft. 11 in. (1,398-889 mm.) ; fourth pair, left 4ft, 3 in., 

 right 4ft. 8 in. (1,296-1,423 mm.) : diameter of largest suckers (on 

 first or dorsal arms), If in. (39mm.). (T. J. Parker.) 



Radula Hutton. T.N.Z.I.. xiv, 162, pi. 6, f. A. 



Type in the Otago Museum, Dunedin. A small co-type is in the 

 Canterbury Museum, Christ-church. 



Hab. Dunedin (type) ; Hal," -moon Bay, Stewart Island (Filhol) ; 

 Lyttelton ; North Shore and Rangitoto Island, Auckland (Cheese- 

 man) ; Campbell Island (Filhol). Hiding in crevices of rocks at or 

 below low-water mark (Cheeseman). 



