ic: 
EXPLANATION OF PLATE V. 
Campanulina ceylonensts (Browne). 
1.—A portion of the stolon bearing three hydrosomes in 
different states, expanded, retracted and retracting, 
the last bearing a gonosome. 
2. -A very young hydrosome attached to the cast skin of a 
Copepod (drawn from a preparation by Mr. F. H. 
Gravely). 
3.—Optical section of a portion of the stem of a fully ex- 
panded hydrosome, protruding from the perisarc, 
showing the everted points of the marginal processes 
of the hydrotheca. 
4.—A portion of the living hydroid showing the web. 
5.—Three planulae reared in captivity, one with a stolon, 
another with a hydrosome and stolon (preparation by 
Mr. F. H. Gravely). 
All figures drawn to scale with the Camera lucida. 
