80 



THE VOYAGE OF H.M.S. CHALLENGER. 



the nucTial region, a few larger oues extend down the back on either side of the middle 

 line ; the warts extend on to the ventral surface of the body, where they become much 

 smaller, more even, and average less than 1 mm. in diameter ; they do not cover the 

 inner surface of the umbrella between the two dorsal arms. Above each eye there 

 seems to have been a short cirrus, but these have been rather damaged. 



Tlie Colour is a dull purplish grey, very dark above, much lighter below. 



Tlie Jaws are figured on PI. IV. figs. 4, 5. 



Dimensions} 



Length, total, . ^ . , 



End of body to mantle margin, 



End of body to eye. 



Breadth of body, 



Breadth of head. 



Eye to edge of umbrella, 



Length of extremity of heotocotylised arm, 



Breadth of extremity of heotocotylised arm, 



Diameter of largest sucker on lateral arm. 



Diameter of largest sucker on ventral arm, 



Length of first arm, ..... 

 Length of second arm, . > . . 



Length of third arm, . . .- . 



Length of fourth arm, .... 



This species difi"ers very markedly from Octopus granulatus, Lamk., in the size and 

 form of the tubercles covering the body and head and in the rows of larger ones down 

 the back, as also from Octopus fontanianus in which the granulation is much finer. 

 From Octopus tetricus, Gould, it difli"ers in the smaller size of the umbrella. 





470 



mm. 





55 







80 







55 







40 







60 







2-5 







1-5 







18 







8 





Eight. 



Left. 



270 2 mm. 



320 mm 



350 „ 



380 „ 



320 „ 



320 2 ^^ 



260 



2 



320 „ 



Octopus granulatus, Lamarck. 



1799. Octopus granulatus, Lamarck, Mem. Soo. Hist. Nat. Paris, t. i. p. 20. 

 1838. „ rugosus, d'Orb., Ceph. acet, p. 45 ; Poulpes, pis. vi., xxiii. fig. 2. 

 1869. „ incertus, Tozz., Cef. Mus. Firenze, p. 22, tav. vi. figs. 9, 11. 



Habitat. — St. Vincent, Cape Verde Islands, April 25, 1876; 15 to 20 fathoms. 

 One specimen, 



Simon's Bay, Cape of Good Hope ; 10 to 20 fathoms. One young specimen. 



Atlantic Ocean, shores of the Antilles and Senegal ; Pacific Ocean, Manila, 

 Mauritius, Batavia (d'Orbigny); Ceylon (W. E. H.). 



Ferussac and d'Orbigny identify this species with Sepia rugosa, Bosc,^ and adopt 

 his name in consequence, but his description is so indefinite that it is hardly sufficient 



1 The arms were so bent and contracted that their lengths can only be regarded as approximate. 

 "■ Mutilated. 3 j^^i^g Soc. Hist. Nat. Paris, 1792, tab. 5, figs. 1, 2. 



