38 MR. G-. A. BOULENG-ER ON FISHES 



92. Rhamphichthys blochii, Kaup. 

 Paraguay. 



93. Rhamphichthys brevirostris, Stdr. 

 Descalvados, Matto Grosso. 



94. Sternopygus carapus, L. 



95. Sternopygus virescens, Val. 

 Descalvados. 



SYMBRANCHID.E. 



96. Symbranchus marmoratus, Bl. 

 Descalvados, Matto Grosso. 



TRYGONID^E. 



97. 'Leniura dumerilii, 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. Oxydoras eigenmanni: 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 and lower views of head: p. 30. 



