862 



ZOOLOGY. 



[Sect, XI. 



»»ould be attended with more precision and facility, as 

 the species is much larger than the spirula^ and its shell 



external 



The towing-net should be kept overboard at all prac- 

 ible periods, and drawn up and examined at stated 

 hitervals. a,s some of the rarest marine animals have been 





taken by thus sweeping the surface of the sea, 



A sketch or drawing of molluscoas and radiate animals, 

 of which the form and colour are liable to be matcriallv 



mi 



altered by death, or when put in spirit, will aid materially 

 in rendering the description of the species useful and in- 

 telligible. 



Some of each species should be preserved in spirit or 

 the solution No. II. If they have died with their soft 

 parts protruded, they should be suspended so as to 

 prevent distortion from pressure. If the shell be of the 

 spiral form 5 the whorls should be perforated with a fine 

 awl so as to allow the spirit or solution to enter ; other- 

 whole 



up tlie 



4 



wise, as the maiil body of the animal fills 

 mouth of the shell, the deeper seated and softer parts 

 would become putrid before the preserving liquor could 

 get to them. 



Where the animal has been detached from its shell, 

 the soft parts and the shell should be marked with corre- 

 sponding rmmbers. When the animal is furnished with 

 an operculum (the little door which closes the mouth of 

 many turbinated shells), it should be carefully preserved ; 

 and if detached from the animal should be so numbered 

 as to prevent the possibility of its being attributed to the 



never be cleaned, but 



wronff snecies 



sp 



Shell 



s should 



should be preserved as they come from the sea, taking 



