ACALEPHjE. 
201 
membranous hoods, or lohed coverings* circulating vessels much 
ramified, and united with a network. 01 the Gyrouophthahuata we 
We an example in JEquei'ea violucea (Fig- 84), in which the disk is 
lightly convex, glass-like in appearance, and furnished all round with 
V| my short, slender, thread-like, violet coloured tentacula ; with eirculat- 
m g vessels, eight in number, quite simple, and ovaries placed on them ; 
Peduncle wide, expanding into many broad and long fringed lobes. 
le Steganoplithalmata include the Medumdm proper, in which the 
iiiaibel is hemispherical, with numerous marginal tentacles, eight eyes 
°' eie d by lobes, four ovaries, four chambers, four fringed arms, with 
Ce ntral and four lateral openings. Aurelia aurita (Fig. 85) is here 
^Presented as a type of the group ; it is plentiful in the Baltic, and 
las been carefully studied by the Swedish naturalists. Rosenthal has 
it s anatomy his special study. Sars has also made it the subject 
0 observations. In the same group we find the Pelagia eyanella 
