Hl'DEOZOA SCYPHOMEDUS.E. 



I'.'.l 



their umbrella, the gelatinous connective tissue of which is richly 

 developed and contains a quantity of strong fibrillje and a network 

 of elastic fibres, which structures confer upon it a greater tirmno.s 

 and rigidity. 



Another characteristic of the group is derived from the structure 

 of the edge of the umbrella. This is divided by a regular number 



GH 



RK 



FIG. 194. Anreliu iiurifa, from the oral surface. MA, The four oral tentacles with the mouth 

 in the centre ; Gk, generative organs ; GH, aperture of genital pouch ; Rk, sense 

 organ (marginal body); KG, radial vessel ; T, tentacle at edge of the disc. 



of indentations usually into eight groups of lobes between which the 

 sense organs are contained in special pits (fig. 194). 



The marginal lobes of the Acalepluv, like the continuous velum 

 of the Hydromeduscr, appear to be secondary formations at the edge 

 of the disc. In the young stage known as Ejihyra, which is common 

 at least to all the Discoj)lwra, they are present as eight pairs of 



Sars. ' Ueber die Entwicklung cler Medusa aurita und < 'yanea capillata." 

 Arekir.fiir Xntiii-i/i-xi-h, 1811. H. J. Clark. " Prodromus of the History, etc.. of 

 the Order Lucernaria," Jotirn. of Jioxt. Sur. of Nat. Jlixt., 1868. (.'. C'laus, 

 ' Studien uber Poh'pen und Quallcn der Adria," Denkschriften <h-r /,'. 

 AhniJi'ini/' ili-r Wixxciixf'li. Wii-ii, 1ST 7. C. Claus. Untersuc'huiigen iiber 

 Charylidea marsupialis," Arbeitrn OHX ilcm Zanl. Institut. II int., 1878. Also 

 E. Haeckel, 1. c. 



