PART II.—MORPHOLOGY, 
EXERCISE I. 
THH SEA ANEMONE. 
Sub-kingdom—C@LENTERATA. Class—ACTINOZOA, 
1. External form.—Place a living animal in a tumbler of 
sea water. When fully expanded, notice the colwmn, 
with rows of small warts, attached by its base to the 
rock from which it was removed. At the upper end 
of the column is the disc, surrounded by rows of 
tentacles. In the centre of the disc is an elongated 
opening, the mouth. Touch the mouth ~with the 
handle of a mounted needle or knife; the tentacles 
immediately close over it. 
2. Internal structure——When the tentacles are again 
fully expanded, drop a few drops of corrosive subli- 
mate dissolved in water or alcohol into the tumbler.* 
When quite dead, fasten the animal to a leaded cork 
by a pin passed through the mouth. Introduce the 
scissors into the mouth, and cut open the animal 
longitudinally ; open the two halves and pin them 
out with small pins.+ 
* Corrosive sublimate is a powerful poison. The same effect may be 
obtained by adding alcohol in very small quantities to the water, but the 
animal takes longer to die. Mr. Gosse recommends stupefying the animal 
by the addition of laudanum, drop by drop. ; 
} If the animal is not quite dead, the muscles of the body-wall will 
contract so strongly on being touched, that it will not be possible to make 
out the mesenteries, 
