r 



ZOOLOGYe 



[Sect. XT, 



i 



EcHiNODERMS (Star-Jish iAsterias% Sea-urchins [Echi- 

 mdaf\, Trepang or Sea-cucumhers [Holothurice]). 



For the preseryation of the entire animal with the soft 



sea-urcliin (Echinus), the 

 arsenical solution (No. II.) is preferable : the softer tre- 

 pangs {HohthuricB) may be preserved in either solution. 

 It should be gi-adually added to the vessel of water in 

 which the living specimen is at rest, in order to kill it, 

 with the soft appendages protruded or elongated. This 



is particularly requisite in the 



c 



of the Holothurice, 



which, if plunged suddenly in solution, are apt to squeeze 



out and rupture their viscera. W 



■h 



'o 



{Ophiurm) 





s called 



" brittle stars," from their habit of breaking themselves 



pieces when captured, these should be instantly 



mto 



plunged into a large 1 )asin of cold fresh water, when they 



die mas 



tate of expansion, and too quickly for the acts 

 of contraction by which tlie rays are broken off. After 

 lying for an hour or so in the fresh water they may be 

 transferred to the solution : if preserved dry they should 

 be dipped for a moment in boiling water, then dried in 

 the sun or in a current of air, and packed in ,.aper. 

 ■^Fhen the specimens have soaked in solution one or two 

 days, according to the temperature, they should l)e re- 

 moved into t>esh solution. The Echini should be sewed 

 up each in a separate bag of muslin, and not be crowded 



F 



so as to press upon each other in the same bottle. The 

 starfish and sea-urchins that are preserved dry should be 

 emptied of their viscera or soft contents by the mouth or 

 larger (lower) aperture, and should then be soaked in fresh 



f 



1. 



^ 



( 



f 



