Fig, 8. — The entire Medusa, profile view (from the side and somewhat from above), 

 natural size. The external velar furrow, which separates the central umbrella disk from 

 the peripheric corona of lobes or velarium, is distinctly perceptible above on the umbrella. 

 The eighty fused marginal lobes are visible on the velarium and the sixteen bifurcate 

 radial streaks, forming a star dike figure, like that of Chrysaora, on the central umbrella 

 disk. The powerful bush of oral curtains hangs clown from the subumbrella, with the 

 genitalia and tentacles outside it. The numerous tentacles are scattered all over the 

 broad tentacle zone of the subumbrella, not grouped in eight bunches (as in the allied 

 Cyanea). The four powerful perradial oral arms (or oral curtains) hang down from the 

 peristom disk, like delicate, richly folded drapery, daintily frdled at the edges. The 

 four interradial gastrogenital pouches, which are only half as long but are also folded like 

 curtains, alternate with the oral arms. Only two of the pouches are visible in the figure ; 

 the frill-like folded genital band forms repeated windings in the bottom of the pouches. 



Fig. 9. — The peristome disk with the central oral cross and the adjacent organs, of 

 a young persona, seen from below, natural size. The four perradial oral arms (ab) 

 alternate with the four interradial genitalia, of which the two lower only are completely 

 visible, the two upper are half hidden under the bases of the oral arm : the frilled, 

 repeatedly twisted genital band (s) lies below in the distal bottom of the thickly folded 

 gastrogenital pouches (gg) whose proximal end is inserted at the cartilaginous oral ring 

 {cm). Only the basal piece of the four oral arms or arm curtains is visible in the figure 

 and represented in such a way as to be fully visible on the upper arm, half cut away in 

 the two middle arms, and removed for the most part in the lowest arm. The upper arm 

 shows how the two diverging side margins of the strong, equilaterally triangular cartila- 

 ginous plate (which forms the basal part of the oral curtains and the distal extension 

 of the brachial pillars) lie one over the other at one point (at ah) like valves, so that 

 the shallow oral groove (ar) after a short course, is almost transformed into a canal. The 

 lower valve (or the lower lateral margin of the triangular cartilaginous plate) is cut away, 

 so that the oral groove (or arm groove) lies entirely open (ar). The latter is laid still 

 more open on the lower arm, of which only the dorsal middle piece of the cartilaginous 

 plate is preserved. Only a small basal piece (aq) of the delicately membraned, richly 

 folded oral curtains, which run from the retroverted side margins of the basal cartUa- 

 ginous plate, is visible ; it shows, however, how the four oral curtains are connected below 

 the oral ring (era) and form a short oesophagus (at). 



Fig. 10. — A genitalium, with the adjacent oral part, from a mature female, natural 

 size. s. The band-shaped ovary, folded like a frill, gg The delicate membraned 

 gastrogenital pouch, era Cartfiaginous ring, ap Perradial oral pillars, at (Esophagus. 

 am Frilled margin of the oral curtains, retroverted upwards. 



Fig. 11. — A small piece of a genital band (spermarium) slightly enlarged. g 

 Follicles of the testis, gg Gastrogenital membrane, f Gastral filaments, scattered 

 over its endodermal inner surface. 



