JELLYFISHES 137 
ORDER CUBOMEDUSZ 
(‘' Cube-meduscee”’) 
Genus Charybdea 
C. marsupialis. Umbrella square, flattened on top, and of firm 
consistency. Four tentacles fall from lobes on the umbrella, and four 
club-shaped eyes are in marginal notches. Plate-like egg-sacs follow 
each side of the four radial canals. The bell is one inch in diameter and 
ebont two inches in height. It is not foundon the coasts of the United 
ates. 
ORDER DISCOMEDUSZA 
(‘' Disk-medusce"’) 
SUBORDER SEMOSTOME 
Genus Aurelia 
A. flavidula. Size eight to ten inches in diameter ; disk gelatinous, 
transparent bluish-white, broad and comparatively flat, with a fringe of 
short tentacles of even length around the margin; margin broken by 
eight notches, in each one of which is a club-like organ (¢entaculocyst) con- 
taining calcareous spots or eyes, which are hidden by lappets or hood- 
like coverings ; groups of nerve- 
cells also lie in the marginal 
notches; radial canals branched; 
manubrium very short, with 
square mouth, which is sur- 
rounded by delicate membranes, 
or oral arms, each arm being 
a folded membrane tapering to 
a point. The edges of tho mem- 
branes are covered with lasso- or 
stinging-cells. Four egg-sacs, 
or gonads, are conspicuous in 
horseshoe shape around the 
center of the disk. The gonads 
are pink in the males, and yellow 
in the females. These meduse 
swim in shoals, and are common 
everywhere in summer. They 
may be said to be annual ani- 
mals, for they make their ap- 
pearance regularly as free- Aurelia favidula, about one fourth natural size. 
swimming meduse in the latter 
part of April, when they may be 
seen in immense numbers near the surface when the water is smooth and 
the sky clear. At this time they are about an inch in diameter. They 
grow rapidly, and by the end of June have attained their full size. At 
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