EXPLANATION OF PLATE I. 



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

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

 ,, 3. — Tropidichthys margaritatus, x i^. 

 ,, 4. — ,, investigatoris, sp. nov., x i-|. 



,, ^.—Antennarius nummifer ^ x i|-. 



