654 



MEDI'S.K (IF THK WORLD. 



Each mouth-arm bifurcates at its outer end and also gives rise to numerous very short, lateral 

 branches upon its lower side. These side branches themselves branch somewhat dichoto- 

 mously, giving a complex system ot mouth-bearing ramiih upon the lower side of the mouth- 

 arm. There are two sorts of appendages between the mouths: small, thin, tubular appendages 

 with prominent nettling-warts and larger, spindle-shaped appendages. These are, however, 



very small in comparison with 

 the size of the branches of the 

 arms themselves. 



In young medusae there are 4 

 separate, subgemtal cavities with 

 4 small, external ostia in the inter- 

 radial sides of the arm-disk. In 

 older individuals we find a very 

 variable condition, the different 

 quadrants of the same medusa 

 being unlike; but it seems that 

 a completely separated, subgemtal 

 porticus, such as that found in 

 Crambessa or Cotylorhiza, is never 

 formed in Ce plica carulescens. 

 The canal-system of the umbrella 

 consists of 8 radial-canals in the 

 radii of the 8 marginal sense- 

 organs and 24 intermediate canals 

 which give rise to numerous side 

 branches, forming a network of 

 canals which place all 32 vessels 

 in communication one with an- 

 other. There is no distinctly 

 differentiated, annular ring-canal. 

 The muscular system of the sub- 

 umbrella resembles Cotvlorlnza in 

 the form of the radial-muscle 

 strands. The marginal ring-mus- 

 cles are, however, very poorly 

 developed. 



The general color appears to 

 be blue. A narrow zigzag band 

 of fiery red, around the outer side 

 of the arm-disk, lies above the 

 subgenital ostia and bends down- 

 ward (outward) at each interra- 

 dius toward the subgenital ostium. 

 Clusters of small, brown, oval 



FIG. 406. "Perirhiza nematophora. tt= Cephea cephea, after Kishinouye, in 

 Journal College of Science Tokyo. 



spots are found near the side of 

 each subgenital ostium. 

 This medusa is found in the Malay Archipelago and Maldive Islands, Indian Ocean. 



The reddish dots found in the typical C. octostyla around the sides of the arm-disk have, in 



this variety, fused into a solid band of color. 



Cephea cephea. 



Mtdusa cephea, FORSKAL, 1771;, Descript. Anim. Itin. Orient., p. 108, No. zz, Icon., tab. 30 (Non. Tabl. 29). 



Medusa octostyla, LINNE, (Gmelin), 1788, Systema Nature, Ed. 13, Pars. 6, p. 3157. 



Cephea rhizostomoideii, PERON ET LESUEUR, 1809, Annal. du Mus. Hist. Nat. Paris, tome 14, p. 361, No. loo. 



Pohrhi-.a cephra+Diplopilus couthouyi, AGASSIZ, L., 1862, Cont. Nat. Hist. U. S., vol. 4, pp. 156, 158. 



Cephea forsta/ea+C. conifera, HAECKEL, 1880, Syst. der Medusen, pp. 574, 576, taf. 36, fign. 3-6. 



( ?) Cephea fusca, PERON ET LESUEUR, 1809, loc. cit., p. 361, No. 99. 



( ?) Cassiopea fusca, DUSIMUER, 1835, Musee du Jardin des Plantes, No. in. 



Perirhiza ncmatophora, KISHINOUYE, 1902, Journal College Sci. Tokyo, vol. 17, Art. 7, p. 14, plate 2, figs. 11-13. 



