124 OCTOPUS. 



A single specimen in Coll. A. N. S., Phila., from Sandwich 

 Islands, I incline to include with this species, although its sur- 

 face is quite granular, with many beards. 



Chili t Peru. 

 O. MEGALOCYATHUS, Couthouy. PI. 36, fig. 51-53. 



Body ovate, smooth, with a narrow lateral border somewhat 

 like a natatory membrane ; head narrow ; eyes prominent ; arms 

 long, with some of the suckers very large ; umbrella very large, 

 its membrane extending to the tips of the arms. Color of back 

 dark chocolate, with streaks of ashy white ; ventrally much 

 paler. 



Total length, 43 in. ; length of body, 5'2 in. ; of arms, 34 in. 



This species is described as smooth, and no mention is made 

 of ocular spots ; otherwise it is closely allied by its lateral mem- 

 brane and general characters to 0. membranaceus. 



Orange Harbor. 

 Arms 2, 3, 4, 1. 



O. MEMBRANACEUS, Quoy. PL 28, figs. 20, 21 ; pi. 29, fig. 28; 

 pi. 38, fig. 57. 



Body obtuse, acutely granular, with a lateral membrane ; 

 head large, granular above and below, ocular beards three, 

 elongate; arms moderate, quadrangular; cups large, the fourth 

 or fifth cups of the lateral arms much larger than the rest; web 

 moderate, granular. An oval blackish eye-like spot between the 

 bases of the 2d and 3d pairs of arms. 



I have figured a portion of membrane with attached eggs 

 (PL 20, fig. 6), obtained by M. d'Orbigny from one of the ani- 

 mals collected by Quoy ; also an enlarged view of the same, 

 showing the embryos (ibid, fig. 7). 1 do not think it belongs to 

 this species or genus, however (see ante, p. 44). 



The museum of the Academy of Natural Sciences, of Phila- 

 delphia, possesses three fine specimens of this species, fully 

 double the size of those figured by d'Orbigny and Quoy. 



New Guinea, Japan, China. 



Arms 2, 4, 3, 1. 

 O. CYANEA, Gray. 



Body ovate, above rather irranular, beneath smooth; ocular 

 tubercle rugose, superior ; arms rather elongate, conical ; cups 

 large, the 10th to 20th of the lateral pairs larger, equal sized, the 



