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ZOOLOGY. 



[Sect. XI. 



cirrjpeds, which, presenting externally little more than a 

 simple aperture, are easily overlooked ; such kinds had 

 better be preserved in the coral. Others live embedded 

 in sponges ; two genera live on whales' skin [Coronula 

 and Tuhidnelld), the development of which needs to be 

 studied by specimens of the ova and young ; another less 



skin of turtles : a third 





itself to the manatee 



or sea-cow; and some small and interesting species of 

 barnacle are parasitic on sea-snakes. Lobsters, crabs, 

 bivalve and other shells, as well as floating pieces of 

 wood, or even net- corks, become the habitat of animals of 

 the class Cirripedia. It should always be noted to what 

 animals these parasitic cirripedes are attached, as well as 



any circumstances that may determine the period durin^T 

 which they have remained attached. 



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Crustacea {Shrimps, Sea-mantises, Cray-fish, Lohst 



Crabs, and King-crahs). 



All the animals of this class are most profitably pre- 

 erved in spirit or solution. If they be defended by a 

 soft, flexible, or horny covering, the solution No. I. 

 answers well ; if by hard, calcareous plates, the solution 

 JS o. II. is preferable. They vary in size from microscopic 

 minuteness to upwards of a yard in length. The larger 

 and middle sized specimens should be kept by themselves, 

 "" """' " " bag if placed with others in the ^-^mQ 



or sewea up m a 

 jar or bottle. iUre and beautiful kinds, with transparent 

 glass-like shells, may be captured by the towing-net in 

 tropical seas. The minuter kinds have been commonly 



neglected, especially those of fresh water : any such 



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