38 MR. G. A. BOULENGBK ON PISHES 



92. Rhamphichthts blochii, Kaup. 

 Paraguay. 



93. Rhamphichthts brevirostkis, Stdr. 

 Descalvados, Matto Grosso. 



94. Sternopygus carapus, L. 



95. Sternopygus virescens, Val. 

 Descalvados. 



SYMBRANCH1D.E. 



96. Symbranchus marmoratus, Bl. 

 Descalvados, Matto Grosso. 



TRYGONID^. 



97. T^NiURA DOMERiLii, Casteln. 

 Paraguay. 



EXPLANATION OF THE PLATES. 



PLATE III. 



Plagioscion ternetzi, \ nat. size, with upper view of head : p. 25. 



PLATE IV. 

 Fig. 1. Geophagus duodecimspinosus: p. 26. 

 Fig. 2. Euanemus nigripinnis : p. 28. 



2 a. Upper view of head. 

 Fig. 3. Oxijdoras eigeiimaiiiii: p. 28. 

 Fig. 4. Callichthys pectoralis: p. 29. 



4 a. Lower view of head and pectoral region. 



PLATE V. 



Plecostomus ternetzi, f nat. size, with upper aud lower views of head : p. oO. 



