228 



EVENINGS AT THE MICKOSCOPE. 



part of the body a large eye is placed, deep-seated, 

 which is of a roundish form, and is intensely black, 

 both by reflected and transmitted light. On the sum- 

 mit of the forehead are jjlaced a pair of thick flexible 

 horn-like organs, which are abruptly bent in the mid- 

 dle, and which I believe represent the first pair of 

 antenna?. This then is the first stage of the Barnacle, 

 — the form under which it appears when it is hatched 

 from the egg. 



Among the multitudes wliich have been evolved 

 during these last few days, and which are now swim- 



YOUNG OF BAKSACLE. 



ming at large in the tank, wo may be able to detect 

 some that have passed through their first stage, and 

 having moulted their skin have attained a more ad- 

 vanced form. Here is one, wliicli by its superior size 

 seems to have made some progress towards maturity. 

 Yes, here are more. These are evidently in their 



