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Sect. XI.] 



ZOOLOGY. 



361 



Those who have paid particular attention to preserving 

 chitons have found it necessary to suffer them to die 

 under pressure between two boards. Ilaliotides (sea-ears) 

 may be removed from the rocks to which they -ndhere by 

 throwing a little warm water over them, and then giving 

 them a sharp push with the foot sidewa} s, when mere 

 violence would be of no avail without injuring the shell. 

 Rolled madrepores and loose fragments of rock should be 



turned over 







other testacca are 



frequently harboured under them. Numbe 





conchifera^ and radiata are generally to be found about 

 coral reefs." — Broderip. 



cVmonnj the floating moUusca likelv to be met with in 

 the tropical latitudes is the spirula^ a small cephalopod 



with a chambered shell. An entire specimen of this rare 

 mollusk is a great desideratum ; and if it 



should 



be 



captured alive, its movements should be watched in a 

 vessel of sea water, with reference more especially to the 

 power of rising and sinking at will, and the position of 

 the shell during those actions. The chambered part of 

 the shell should be opened under water, in order to 

 determine if it contain a n;as; the nature of this <;as 



^ 



should likewise, if possible, be ascertained. As a part 

 of the shell of the spirula projects externally at the pos- 

 terior part of the animal, this part should be laid open 

 in the living spirula, in order to ascertain how far such 



mutilation would affect its power of rising or sinking in 

 the water. 



In tl- event of a living pearly nautilus {Nautilus Pom- 

 pilius) being captured, the same observations and experi- 

 ments should be made on that species, in which they 



E 



