668 MANUAL OF NATURAL HISTORY. 



then have the peduncle stuffed with cotton, to keep 

 it of the natural size and form when dry, the valves 

 should also be kept apart by the same material, and 

 the arms of the animal allowed to dry protruded. 

 Sessile species should be emptied of the soft parts of 

 the animal, the shell filled with cotton, the opercular 

 portions placed in their natural position on the cot- 

 ton and fastened to it with gum, and when the 

 specimens are in groups, the arms of some of the 

 animals should appear through the openings. 



Specimens of Crustaceans and Cirrhopods ought 

 to be packed very carefully in soft materials, par- 

 ticularly the former, and, as far as practicable, they 

 should be placed separately in chip-boxes, and have 

 camphor put with them. In case of their becoming 

 mouldy or infected with mites, they may be treated 

 after the manner described for insects. 



Annelida. All the species are best preserved in 

 spirits, and for those which are not liable to be cor- 

 rugated by it, undiluted spirit is preferable. The 

 specimens should, as far as possible, be kept separate 

 in small bottles. 



RADIATA AND ACRITA. 



Star-fishes, Sea-urchins, Sea-cucumbers, and other 

 Echinoderms are best preserved in camphorated 

 spirits. If any specimens are required for subsequent 

 dissection, they should be preserved in alcohol, to 

 which a little ammonia has been added. 



The Brittle-stars, however, must be suddenly 



