G80 MEDUS.« OF THE WORLD. 



Arm-disk wider than bell-radius, and the subgenital ostia are twice as wide as the radial 

 supports between them. 8 wide, ocular radial-canals and 7 anastomosing, radial vessels in 

 each octant. Mouth-arms are twice as long as bell-radius, the smiple upper part of the arm 

 being somewhat shorter than the lower, 3-winged part. Each arm terminates in a single club 

 as long as the bell-radius. 



Bell light yellowish-brown with round white spots, which are largest over the ring-canal 

 and smaller near the margin, where they are arranged in 3 or 4 radiating rows between each 

 successive pair of marginal sense-organs. 8 blackish streaks along the 8 ocular radial-canals 

 on the subumbrella, and also white specks in each octant of the subumbrella between the 

 stomach-pouches and the circular furrow. Arms brown with small white spots. Filaments 

 yellowish. 



Found along the Zanzibar coast, East Africa, in .August and September, and in the western 

 parts of the Indian Ocean. 



Chun, 1896, gives a detailed description of the adult and the young of this species. 



Haeckel's Eucrambessa mullcrt from Madagascar is probably identical with this species, 

 but is so imperfectly described that we will never be able to determine it with certainty. 



Mastigias papua var. sibogas Maas. 



Mattigias papua var. siboga, Maas, 1903, Scyphomedusen der Siboga Expedition, Monog. 11, p. 66, taf. 6, fign. 54-57; taf. 7, 

 fign. 58, 59, 61, 64; taf. 8, fign. 75-77; taf- 9. fign- 84, 85; taf. ij, fig. 1 10. 



Bell massive, rounded, and when mature 120 mm. in diameter. There are about 9 

 rectangular velar lappets with rounded angles in each octant between sense-organs. The 

 4 interradial ostia of the subgenital porticus are 3 times as wide as the columns between them 

 There are 7 to 10 anastomosing radial-canals between each successive pair of rhopalar canals. 

 Mouth-arms as long as the bell-radius. There are numerous small, rounded clubs upon 

 each of the mouth-arms and also a terminal appendage, which is triangular in cross-section 

 and nearly as long as the bell-diameter. 



The ground color is yellowish (?) with orange (?) spots. There are no ring-shaped 

 spots upon the exumbrella. There are 8 violet radial bands upon the rhopalar canals. The 

 terminal appendages of the mouth-arms are sprinkled over with violet spots. The canal- 

 system is rose-colored and the gonads are orange. 



This variety is found in the Malay Archipelago, and is described in detail by Maas, 1903. 

 It is distinguished from the typical M. papua by the absence of "eye spots" upon the exum- 

 brella, b)' Its yellow or orange color, and by its nearly rectangular velar lappets. 



Mastigias ocellata Haeckel. 



Medusa ocellata, Modcer, 1791, Nova. Acta. Phys. Med., N. C, tome 8, Append., p. 27. 



Crphea ocrllaia, PtRON ft Lesleur, 1809, .^nnal. du Mus. Hist. Nat. Paris, tome 14, p. 361. 



Cephta ocellala+ Hidroticui rufui, AtiASSlz, L., l86i. Cent. Nat. Hist. V. S., vol. 4, pp. 156, 158. 



Mastigias ocellata, Haeckel, 1880, Syst. der Mcdusen, p. 623. — VANHorFEN, 1888, Bibliothcca Zoologica, Bd. i. Heft. 3, pp. 



33, 44, taf. 5, fign. 3-6; I90Z, Wisscn. Ergeb. Valdivia Expcd., Bd. 3, Lfg. i, p. 49. — Maas, 1901, Scyphomedusen Siboga 



Eipcd., Monog. II, p. 63. 



This medusa is distinguished from M. papua by the peculiar "eye spots" on the exum- 

 brella. These may be described as white circles with a brown center and brown rim. There 

 are also other simple brown spots on the exumbrella. The mouth-arms are shorter than in 

 .1/. papua, being shoner than the bell-radius, and the terminal clubs are not longer than the 

 bell-radius. Velar lappets more numerous than A/, papua, there being about 12 rounded 

 velar lappets between 2 narrow, pointed, promincnth' projecting, ocular lappeis in each octant. 

 1 here are 15 to 20 anastomosing radial-canals in each octant between the rhopalar canals, 

 instead of about 7 to 9 as in M . papua. 



General color reddish, with numerous white, brown-rimmed, and centered "eye spots" 

 on the exumbrella. Tips of terminal club blue. 



The medusa becomes about 50 to 60 mm. wide and is found in the eastern parts of the 

 Indian Ocean and in the China Sea. Straits of Sunda, Hongkong in October, Cocos, and 

 Philippine Islands. The /llhatross found small medusae in March and April, and a mature one 

 in January in the Philippines, in 1908. 



