654 



MKDUS.E OF THE WOULD. 



Each mouth-arm hifurcates 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, <;ivintr a complex system of" mouih-bearinfi; ramuli 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 \-oung medusa; there are 4 

 separate, subgenital cavities with 

 4 small, e.\ternal ostia in the inter- 

 radial sides of the arm-disk. In 

 older individuals \ve find a very 

 variable condition, the different 

 i]uadrants of the same medusa 

 being unlike; but it seems that 

 a couiplcttly separated, subgenital 

 porticus, such as that found in 

 Crambessa or Cotylorhiza, is never 

 formed in Cephea ccerulcscens. 

 The canal-s\stem of the umbrella 

 consists of 8 radial-canals in the 

 radii of the 8 marginal sense- 

 oigans 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 Cotylorhiza in 

 the form of the radial-muscle 

 strands. The marginal ring-mus- 

 cles are, however, very poorly 

 de\eloped. 



The general color appears to 

 be blue. A narrow zigzag band 

 of fierv 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 

 spots are found near the side of 

 each subgenital ostium. 

 This medusa is found in the Malav 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. 



Fic. 406.— " Pf r/V/i/'rfl nemaiol>hora"= Cephea cephea, after Kishinouyc, in 

 journal College of Science Tokyo. 



Ceptiea cepliea. 



Meduta cephea, Forskal, 1775, Descript. Anim. Itin. Orient., p. 108, No. 22, Icon., tab. 30 {Non. Tabl. 29). 



Medusa ocioiiyla, LiNNt, (Gmelin), 1788, Systema Natur.T, Ed. 13, Pars. 6, p. 3157. 



Cephea rliisoilomoidea, PtKON ft Lesieir, 1809, Annal. du Mus. Hist. Nat. Paris, tome 14, p. 361, No. 100. 



I'rj\rhira eephea+ Diplopilus couthouyi, AI.A^slz, L., 1862, Cont. Nat. Hist. I'. S., vol. 4, pp. 156, 158. 



Cephea forskalea+C. coitifera, Haeckel, 1880, Syst. dcr Meduscn, pp. 574, 576, laf. 36, fign. 3-6. 



{0 Cephea fuita, PlftoN it Lesvcur, 1809, /or. ri'/., p. 361, No. 99. 



(!)Caiiii>pea fuica, Di'siMi;tR, 1835, Mus<5e du Jardin des Plantes, No. lit. 



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



