MKDUS.'E OF THE WORLD. 



extend downward into the 8 mouth-arms and each give oft a horizontal branch which 

 extends into the center of the arm-disk where they unite in a single short duct. 



Each wait of the central dome is pigmented with lines of numerous, minute, brown dots 

 converging toward the pointed apex of the wart. There are also brown dots on the sides ot 

 the arm-disk. The oral frills are brown and the gonads pinkish. 



Found in August and September in the Inland Sea, and at Misaki and Senzaki, Japan. 



A shrimp is commensal with the medusa, hence its popular Japanese name "Yebi- 

 kurage" (shrimp medusa). 



Cephea typhlodendrium. 



Netrostoma tvplilodendriun, SCHULTZE, L. S., 1898, Denkschr. Med. Nat. Ges. Jena., Bd. 8, p. 457, taf. 34, fign. lo-l2a. MAAS, 

 1903, Scyphomedusen der Siboga Expedition, Monog. 11, p. 38. 



Bell flatly rounded, 110 mm. wide. The center of the exumbrella is occupied by a low 

 dome completely covered with about 80 rounded warts of various sizes. There is no ring- 

 furrow around the dome. The outer parts of the exumbrella are smooth. 8 marginal sense- 

 organs. 80 marginal lappets composed of 64 rounded or cleft, velar lappets and 16 narrow 

 sharp-pointed ocular lappets. The 8 mouth-arms arise from a thick arm-disk. The mouth- 

 arms branch dichotomously and are laterally compressed. Small, spindle-shaped, sharp- 

 pointed filaments are found only on the arm-disk. There are 4 very small, round, subgenital 



409. 



FIG. 408. Ctphca drrulfa, after Vanhoffen in Valdi-cia Expedition. 



FIG. 409. Ctphta setouchiwui, Kishinouye, in Journal College of Science, Tokyo. 



ostia and a unitary, subgenital porticus. The stomach gives rise to 32 radial-canals: 8 ocular, 

 24 interocular. The interocular canals give rise, distally, to blindly-ending side branches, 

 peripherally to anastomosing branches; but the 8 ocular canals give off only the peripheral, 

 anastomosing vessels. These ocular canals are wider than the interocular and extend straight 

 through the marginal network to the 8 rhopalia, whereas the interocular vessels become lost 

 in the peripheral network. There is no definite ring-canal. 



Found at Amboina, Molluccas, Malay Archipelago. 



This may be a well-defined species, for it appears to be distinguished from other members 

 of the genus by its small, sharp-pointed, ocular lappets. 



Genus COTYLORHIZA L. Agassiz, 1862. 



Colylorhiza, AGASSIZ, L., 1861, Cont. Nat. Hist. U.S., vol. 4, p. 158. HAF.CKF.L, 1880, Syst. der Medusen, p. 609. CLAUS, 1883, 

 Untersuch. Organisation und Entwick. Medusen, p. 60, Leipzig. VANHOFFEN, 1888, Bibliotheca Zoologica, Bd. I, Heft. 3, 

 pp. 27, 40. MAAS, 1903, Scyphomedusen der Siboga Exped., Monog. 1 1, pp. 32, 80, 89. 



The type species is the well-known Cotylorliiza tuberculata (McJusu tuberculata Maori) 

 of the Mediterranean. 



GENERIC CHARACTERS. 



Rhizostomata Jic/iotoma with 8 simple, bifurcated mouth-arms, the terminal branches 

 of which branch pinnately. The 4 subgenital ostia are simple and funnel-shaped, and there 



