124 OCTOITS. 



A single specimen in Coll. A. N. S.. I'hila.. from Sandwich 

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

 face is quite granular, with many beanU. 



Chili, Peru. 

 <>. MKGALOCYATHUS, Couthouy. PI. 36, fig. ol-f>3. 



Body ovate, smooth, with a narrow lateral border somewhat 

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

 long, witli some of the suckers very large; umbrella very lariM-. 

 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. ;V2 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 ; 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, tin- fourth 

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

 moderate, gran i da r. An oval blackish eye-like spot between the 

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



I have figure* 1 a portion of membrane with attached e^us 

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

 mals collected by (.Juoy ; also an enlarged view of the xinie. 

 showing the embryos (ibid. fig. 7). I 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 line specimens of this species, fully 

 double the si/e of those tio-ured by d'Orbigny and Quoy. 



New Guinea, Japan, China. 



Anns 2, 4, 3, 1. 

 O. CYANEA. (Jray. 



Body ovate, above rather 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 



