MANUAL OF NATURAL HISTORY. 667 



Whenever mould makes its appearance on insects 

 preserved in boxes, they should be touched with 

 camphorated spirit applied with a camers-hair pen- 

 cil ; the same thing should be done when mites are 

 observed, or they may be touched with a weak solu- 

 tion of corrosive sublimate in alcohol. Camphor 

 should always be kept in the boxes. 



Aiolopoda. The greater number of these will be 

 best preserved in spirits, though some, such as the 

 Sugar-lice, should be kept in small glass tubes. 



Arachnida. These are all best preserved inspirits. 



Crustacea and Epizoa. Some are best kept in 

 spirits, but many may be preserved in a dry state, 

 to effect which, the specimens must first be placed 

 in fresh-water for two or three hours, to remove the 

 salt, when they may be opened by removing the 

 carapace in Brachyurous, and by separating the tail 

 from the thorax in Macrourous Crustaceans, and 

 taking out the soft parts, at the same time, the 

 muscle from the large chelae of Crabs and Lobsters 

 should be drawn out by means of a crooked wire, 

 and if the specimens are very large, it should also 

 be taken from the other legs ; a little preservative 

 may then be applied, the separated parts reunited, 

 and the specimens set aside to dry, after placing the 

 legs and antennae in their proper positions. 



Cirrhopoda. Many of these are best kept in 

 spirits, indeed some specimens of all species should 

 be so preserved. To preserve them in a dry state, 

 they must first be put into fresh water, as mentioned 

 for the Crustaceans, the pedunculated species should 



