022 



Mn. n. n. whitehouse ox the 



[Apr, 



'J'lie figures liere reproduceil from those of Agassiz ai-e interesting 

 in showing how, in lioniocercal tails, tlie original caudal tin is 

 replaced by a more anterior fin ; T have observed exactly the 

 same thing in Atherina, and it is highly probable that it is quite 



Text-fi". 57. 



Development of the tail of the Flouniler. After Prof. Alex. Apissiz. 

 n, notochord : c, embryonic ciuidnl fiu ; //, livpiiral plates. 



a general rule. The deep incision between the original and 

 permanent caudal is very probably only the vestige of a once 

 prominent gap between the two fins, and lience the honiocercal 



