228 EVENINGS AT THE MICEOSCOPE. 



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 placed 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 

 antennae. This then is the first stage of the Barnacle, 

 — the form iinder which it appears when it is hatched 

 from the egg. 



Among the multitudes which have been evolved 

 dui'ing these last few days, and which are now swim- 



/ 





,K 



'' f^'M 



' / 



//|i 



TOTTNG OF BARNACLE. 



ming at large in the tank, we 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, which by its superior size 

 seems to have made some progress towards maturity. 

 Tes, here are more. These are evidently in their 



