Boone, Mollitsca, Cruises of "Ara" and "Alva*' 355 



about 80 percentum of the total length and are nearly subequal, 

 decreasing in the order 4, 3, 1, 2, by about 0.5 centimeter differ- 

 ence between the pairs. The skin is smooth in relaxed portions 

 but has a rough, somewhat scaly appearance in the wrinkled 

 (death-contorted) areas ; there is also a large supra-ocular cirrhus 

 with four or five supplementary tubercles adjacent. There are 

 also numerous dorsal tubercles present in various stages of dis- 

 tortion. There is a distinctive ocellus present on the dorsad of the 

 web between the bases of the third and fourth arms and the eye ; 

 this ocellus has a long diameter equal to about one-sixth of the 

 mantle and consists of an ovate dark purple eye-spot margined by 

 a paler ring, which in turn is margined by a narrow dark purple 

 line. 



References: Octopus cyanea, Gray, J. E., Catal. Mollusca Brit. 



Mus. N. H., pt. 1, 1849, p. 15. — RoBSON, G. C, Monogr. Recent 



Cephal. Brit. Mus. N. H., pt. I, 1929, p. 94, text figs. 21-23 



(with extensive synonymy). 

 Octopiis marmoratus, Hoyle, W. E., Ann. Mag. Nat. Hist. ser. 5, 



vol. XV, p. 227 ; Rept. H. M. S. "Challenger" Zool., 1886, vol. 



XVI, p. 85, pi. 6. 

 Polypus Tnarmoratus, Berry, S. S., Proc. U. S. Nat. Mus., 1909, 



vol. XXXVII, p. 418; Bull. U. S. Bur. Fish., 1912 (issued 



1914) , vol. XXXII, p. 291, pis. 45, 48, fig. 6. 



Octopus (Octopus) macropus Risso 



Plate 150 



Type : Risso's type was collected along the northern shores of 

 the Mediterranean Sea and is deposited in the Municipal Museum 

 at Nice. 



Distribution : The bathymetric occurrence of this species is 

 from the tide line down to 100 fathoms. Geographically it ranges 

 from the Mediterranean (the type locality; Risso, Verany, Jatta, 

 Lo Bianco, Robson) ; Naples, Messina (Robson) ; into the adjacent 

 waters of the northeast Atlantic (Joubin, Girard) ; Lanzarote, 

 Canary Islands (Robson) ; the Red Sea (Wulker, Robson) ; East 



