658 



MEDUSA OF THE ■\VOUI.I). 



extend downward into the 8 mouih-arms and each <;ive ott a horizontal luancli which 

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



Each wart of the central dome is piijmented with lines of numerous, minute, brown dots 

 conver"inj; toward the pointed apex of the wart. There are also brown dots on the sides ol 

 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 Scnzaki, Japan. 



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

 kurage" (shrimp medusa). 



Cephea typhlodendrium. 



Xeirosioma lyphlodenttrium, Schultze, L. S., 1898, Denksclir. Med. Nat. Gcs. Jena., BJ. S, p. 457,taf. ^4, fign. lo-iia. — Maas, 

 1903, Scypliomcduscn dcr Sihoga Expcdilion, Monog. 11, p. 58. 



Bell flath' rounded, no mm. wide. The center ot 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 clett, velar lappets and 16 narrow 

 sharp-pointed ocidar 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. — Cephea cctrulea, after V^anhoffen in Valdivia Expedition. 



Fi<;. 409. — Cephea seioiichiaaa, Kisbinouye, 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 blindl3-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 e.xtend 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, MoUuccas, Malay Archipelago. 



Fhis may be a well-defined species, for it appears to be distinguishcil fnmi other members 

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



Genus COTYLORHIZA L. Agassiz, 1862. 



Coiylorhiia, Agassiz, L., i86», Cont. Nat. Hist. U. .S., vol. 4, p. 158.— Hakckfi,, 1880, Syst. dcr Meduscn, p. 609.— Claus, 1883, 

 Untcrsuch. Organisation und Entwick. Meduscn, p. 60, Leipzig.— Vanhokkh.n, 1888, Bibliothcca Zoologica, Bd. 1, Heft. 3, 

 pp. 27, 40.— Maas, 1903, .Scyphomcduscn dcr Sihoga Exped., Monog. 11, pp. 32, So, 89. 



The type species is the well-known Cotylorhiza tuhcrculata {Medusa liibcrniUita Macri) 

 of the Mediterranean. 



GENERIC CHARACTERS. 

 Rhizoslomala Jichotoiiia with 8 simple, bifurcated mouth-arms, the terminal branches 

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



