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Sect XL] 



ZOOLOGY. 



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water, clianged two or three times, for so many hours, or 

 until the saline particles of their native element have been 

 extracted, before they are dried. The Echini should be 

 wrapped up in cotton and sewed up, each in its separate 

 bag, in order to preserve the spines, which may become 

 detached in the course of a voyage, and are apt to 

 become so if the precaution of soaking away the saline 



' taken. AH Echini nnd star- 

 fish should be examined for small shells (Stylifer of 

 Broderip, for example), which nestle in and among the 

 rays and at the roots of the spines, and for otlier parasites. 

 Recent Pentacrini (Lily-stars), especially their bases, 

 will be valuable acquisitions. They m.ay be dredged up 

 of large size in tropical seas, as those of 



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Entozoa (intestinal worms and other internal parasites) 



These arc to be preserved either in solution No. I. 

 or in colourless proof-spirit. This class of animals has 

 been too much neglected by collectors. Every animal 

 that is opened and dissected, especially fishes, may pre- 

 sent rare or undescribed species of Entozoa. The eyes 

 of fishes are often the seat of such : the noses of sharks 

 are frequently infested by them. They may be found not 

 only in the alimentary canal, but in the tissues of most of 

 the organs. When the parasite is adherent, the part to 

 which it adheres 



should be removed 



vith it. care bein 



to secure the whole mouth or proboscis of the 

 parasite. When it is encysted in an organ, the cyst is 

 to be removed entire with the snrrounding tissue of the 

 organ. Portions of muscle or other tissue which app^'^r 



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