DISSECTION OF HOLOTHURIAN3. 



137 



Laboratory Work. The Holotlmrians are easily dissected by cutting 

 the body open longitudinally, and pinning the specimen down in a 

 dissecting-pan, with wax on the bottom for holding the pins. The 

 calcareous plates can be extracted from the body-walls by being placed 

 in a solution of potash and mounted in balsam as microscopic objects. 



LIBRA R Y 



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Encrinus or Stone Lily. 



