| 92 POLYPI. 
a needle, or very fine wire is introduced into the perforation, 
after it has been filled with cement. The shell of the Echinus 
must now be filled with melted bees’-wax : care is taken to stop 
| up all the openings, while in the act of pouring in the melted 
_ wax. When the wax has cooled, a hole is bored in each tu- 
| berele, for the reception of the needle, which must first be 
| warmed at a lighted candle, and, the wax cooling, holds the 
needle firmly in its place. 
A better plan, however, than the above is, to use very fine 
wire, which ought to be bent as nearly at right angles as pos 
sible, before being introduced ; and, having filled up all the 
vacancies of one side in this way (always leaving as much out- 
side as will fit into the perforation made in the base of the 
spine) ; pour in some cement, made as thin as it will flow 
easily, and then set it aside todry. Repeat the same operation 
with the other side; and, when dry, the spines may be placed 
_ on the projecting wires with cement, as above directed. The 
wire which is left outside should be roughened with a file here 
_and there, previous to its being inserted, so that it may the 
_ better retain its hold in the cement. 
CLASS XI.—ENTOZOA; anp CLASS XII.— 
ACALEPHA. | 
The animals of these classes are best preserved in spirits, 
and indeed there is no other manner of setting them up. We 
have made attempts to preserve worms, by removing the in- 
testinal canal and oviducts, and injecting the skin with wax, 
but we never succeeded in rendering them natural in point of 
_ shape. We have also tried the same method with different 
| species of Actinea, or Sea Suckers, but the same unsuccessful 
results have attended them. 
CLASS XIII—POLYPI. 
Zoophites, or Corals, generally live in families or congre- | 
gated masses, Their axis is of a horny consistence, generally 
hard, and disposed in layers; their surface is usually fur- 
2 t , ¥ 
I 
