OCTOPODIDAE 487 



under large rocks and crevices near shore. This is O. rugosus of authors, 

 O. americaniis Blainville and O. carolinensis Verrill. 



Octopus macropus Risso of the West Indies (and possibly Key West) 

 has its first arm the largest and longest, has a hgula-index up to 14, and a 

 wart over one side of the eye. The skin in preserved material has small 

 reddish warts. The eggs are less than 2 mm. in length (see fig. looe). 



Figure 100. Atlantic and Pacific Octopus. The tip end or ligiila of the third right 

 arm in the male, a, Octopus vulgaris Lamarck; b, O. burryi Voss; c, O. briareus 

 Robson; d, O. joubini Robson; e, O. macropus Risso; f, O. hongkongensis Hoyle 



(Pacific). 



Briar Octopus 



Fissure looc 



Octopus briareus Robson 



Southern Florida and the West Indies. 



Length, including longest arm, i to i Y2 feet. Arms fairly thick at the 

 bases, quite long, especially the third and sometimes the second. Mantle- 

 index 13 to 30, but usually about 17. Ligula-index about 4. Gill plates 7, 

 rarely 8. Skin smoothish, or finely granular in preserved material; in life, 

 pinkish brown to red-mottled. Eggs elongate, translucent-white, 10 to 12 

 mm. in length and with equally long attachment stalks. Fairly common be- 

 tween tides under large coral blocks on the Lower Florida Keys. 



Octopus burryi Voss 



Southern half of Florida and the Gulf of Mexico. 



Hurry's Octopus 



Figure loob 



Length, including the longest arm, 6 to 10 inches. Characterized by a 

 broad band of dark purple on the top surface of the arms, and, in preserved 

 specimens, by the skin which is covered with closely set, round papillae or 

 warts. Gill plates 8 to 10 in number. Ligula-index 4 to 5. This is a recently 

 described species named after a famous Florida collector, Leo L. Burry of 



