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, Peru. 

 O. MEGALOCYATHUS, Couthouy. Fl. 3G, 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 verj' large ; umbrella ver^- 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. PI. 28, figs. 20. 21 ; 1)1. 29, fig. 28; 

 pi. 38, fig. 5<. 



Body obtuse, acutely granular, Avith 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 

 (PI. 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, 1). 1 do not think it belongs to 

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



Tlie nuLseum of the Academy of Natural Sciences, of IMiila- 

 delphia, possesses three fine specimens of this species, fully 

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



Nexo Guinea, Japan, China. 



Arms 2, 4, ?>, 1. 

 O. CYANEA, Gray. 



Body ovate, al)0ve ratlier granular, beneath smooth ; ocular 

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

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



