[ xi ] 



ADVERTISEMENT. 



In laying its Memoirs before the Public, this So- 

 ciety does not hold itself as responsible for the 

 facts or opinions which may be advanced on the va- 

 rious topics of Natural History that are discussed. 

 These, accordingly, must be distinctly understood as 

 resting entirely on the individual authority of the 

 respective Writers who have favoured the Society 

 with Communications. 



