EXPLANATION OF PLATE I. 



Fig. I. — Trygon fluviatilis (much reduced). 

 ,, 2. — Tetrodon spinosissimus, x i^. 

 „ J. — Tropidichthys margaritatus , x i^. 

 ,, 4. — ,, investigatoris, sp. nov., x i\. 



,, 5. — Antennarius nummi/er ^ x ij. 



