294 PROCEEDINGS OF THE ACADEMY OF 



Plate XII. 



Fig. 1. Myletes albiscopus Cope. 

 " 2. Myletes oculus Cope. 

 " 3. Myletes herniarius Cope. 



Plate XIII. 



Fig. 1. Megalohrycon onelanopteriim Cope. 

 " 2. XipJwstoma tado Cope. 

 " 3. Characidium etheostoma Cope. 



Plate XIV. 



Fig. 1. Triportlieus flavus Cope. 



" 2. Triportlieus albus Cope. 



" 3. CJialcinus culter Cope. 



" 4. Calliclitliys inelampterus Cope. 



" 5. The same ; liead from above. 



Plate XY. 



Fig. 1. Doras grypus Cope. 

 " la. Do. from below. 



" 2. Choitostomtis tectirostris Cope. 

 " 3. CTimtostomus alga Cope, from above. 



Plate XYI. 



Fig. 1. Plecostomus scopularius Cope ; one-fourth natural size, 

 " 2. Same from below. 



Plate XVII. 



Fig. 1. Nothopsis rugosus Cope. 

 " 2. Do. head from side. 



"3. Do. ;i u above. 



" 4. Do. " " below. 



" 5. Dentition of upper jaw and palate. 

 " G. Trigonocephalus atrox Cope, var. from Central America. 



[February 13, 



