220 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The mouths are developed not only along the edges of the three leaf- 

 like wings of the lower parts of the mouth-arms, but also over parts 

 of their flat, expanded sides. The central stomach gives rise to eight 

 rhopalar-canals and numerous, interocular radial-canals, all of 

 which anastomose and finally connect with the ring-canal. The 

 rhopalar-canals extend straight to the sense-clubs, but the inter- 

 rhopalar-canals end in the ring-canal. On its outer side the ring- 

 canal gives off a network of vessels which extend into the lappet-zone 

 and fuse with the outer ends of the rhopalar-canals. The ring- 

 muscles of the subumbrella are interrupted in the eight rhopalar 

 radii. There is a unitary subgenital porticus. 



MASTIGIAS PAPUA (Lesson). 



Cephea papua Lesson, 1829, Voyage de la Coquille, Zooph., p. 122, pi. 11, 



figs. 2, 3. 

 Mastigias papua Agassiz, L., 1862, Cont. Nat. Hist. U. S., vol. 4, p. 162. — 



Mayek, 1910, Medusae of the World, vol. 3, p. 678, fig. 415.— Light, 1914. 



Philippine Journ. of Science, vol. 9, p. 209. 



This common medusa is widely distributed over the Malay Archi- 

 pelago, Indian Ocean, and China Sea to Japan, and outward over 

 the Pacific to the Fiji Islands. It gives rise to a number of varieties. 

 Eight specimens, the largest 59 mm. in diameter, were found by the 

 Albatross in the Philippines. Two specimens are from Santiago 

 Eiver, Pagapas Bay, Luzon, February 20, 1909; two, Cat. No. 28735, 

 U.S.N.M., are from Pandanon Island, between Cebu and Bohol, 

 March 24, 1909, and four, Cat. No. 28732, U.S.N.M., were taken on 

 the surface off Cebu on September 5, 1909. It was abundant in shal- 

 low water among the mangroves in Port Moresby, Papua, in No- 

 vember, 1913. 



MASTIGIAS OCELLATA (Modeer). 



Medusa ocellata Modeer, 1791, Nova. Acta. Phys. Med., N. C, vol. 8, Ap- 

 pend., p. 27. 



Cephea ocellata Peron and Lesueur, 1809, Annal. du Mus. Hist. Nat., Paris, 

 vol. 14, p. 361. 



Mastigias ocellata Haeckel, 1880, Syst. der Medusen, p. 623. — Mayer, 1910, 

 Medusae of the World, vol. 3, p. 680. 



The Albatross found small medusae of this variety in March and 

 April, and a mature one, Cat. No. 27919, U.S.N.M., in January in 

 the Philippines, in 1908. It is distributed over the eastern parts of 

 the Indian Ocean and in the China Sea. 



Genus PHYLLORHIZA L. Agassiz, 1862. 



Phyllorhiza Agassiz, L., 1862, Cont. Nat. Hist. U. S., vol. 4, p. 158. — Mayer, 

 1910, Medusae of the World, vol. 3, p. 684. 



Generic Characters. — Similar to the closely allied Lychnorhiza, 

 but the centripetal vessels which arise from the inner side of the 



