On p. 173, it is necessary, through accidental ti ansposition of matter, to make 

 the following important correction, namely, to substitute for the first six lines the 

 following : 



That the cavity upon the ventrals, containing the muscular gland, 

 fills so readily with the sperm when the claspers are erected, and 

 that its contents are expelled, upon contraction of the muscles 

 around it. with such certainty to their ends, when restored to their 

 normal position, are evidences that it acts as a forcing or squirting 

 apparatus. 



