382 MEMOIRS OF THE CARNEGIE MUSEUM. 



EXPLANATION OF PLATE XLV. 



Fig. 1. Pygidium punctatissimum (Castelnau) after Castelnau. 



Fig. 2. Pygidium rivulalum (Cuvier & Valenciennes). After Castelnau's figure of 

 Trichomycterus pentlandi. 



Fig. 3. Pygidium rivulalum (Cuvier & Valenciennes). After Castelnau's figure of 

 Trichomycterus pictus. 



Fig. 4. Pygidium punctulatum (Cuvier & Valenciennes). After Cuvier & Valen- 

 ciennes. 



Fig. 5. Pygidium dispar Tschudi. After Tschudi. 



