944 THE AMERICAN NATURALIST. [VoL. XXXIII. 
If only one quadrant is cut out, the larger part (three-fourths 
piece) forms a medusa having three radial canals and three- 
fourths the number of tentacles. 
Other experiments were made to see if smaller pieces than 
one-fourth would develop into the form of medusæ. These 
smaller pieces were cut off in different ways and from different 
parts of the medusa. If the jellyfish is taken from the water 
d and laid on its side on a glass 
b plate, a portion of one side 
\ may be easily cut off in the 
’ l Q way indicated by the line a—d 
in Fig. 6. A piece cut off in 
this way will contain only a 
part of one radial canal, but 
. somewhat more than one- 
fourth of the margin with its 
5 tentacles (approximately one- 
third in this case). If the 
plane of division is less oblique, 
as indicated by the line c—d in 
Fig. 6, then the entire piece 
in all its parts is smaller than 
one-fourth the entire medusa. 
In both experiments a small 
bell-shaped individual develops 
from the piece. The new 
manubrium regenerates from 
the cut end of the radial canal, 
and lies to one side of the new medusa. This shows that a new 
manubrium may develop from the radial canal some distance 
from the original stomach. 
Small pieces were also removed in another way. The proxi- 
mal part of the bell was cut off from the distal part, as shown 
by the line a—é in Fig. 7. Then the distal ring was cut up 
into smaller pieces, as indicated by the vertical lines in the same 
figure. In one case the ring was cut into four equal parts, 
each with a part of a radial canal. The pieces closed in, but 
somewhat imperfectly, and although they were kept for twenty 
Fic. 6. 
