294 PROCEEDINGS OP THE ACADEMY OP 



Plate XII. 



Fig. 1. 3[yletes alhiscopus Cope. 

 " 2. Myletes oculus Cope. 

 " 3. Myletes herniarius Cope. 



Plate XIII. 



Fig. 1. Megalohrycon melanopterum Cope. 

 " 2. Xiplwstoma tcedo Cope. 

 " 3. (Jharacidium etheostoma Cope. 



Plate XIY. 



Fig. 1. TriportJieus flavus Cope. 

 " 2. Triportheus albus Cope. 

 " 3. Clialcinus ctiUer Cope. 

 " 4. CaUichihys melampterus Cope. 

 " 5. The same ; head from above. 



Plate XY. 



Fig. 1. Boras grypus Cope. 

 " la. I)o. from below. 



" 2. Cliatostomus tectirostris Cope. 

 " 3. Chcetostonius alga Cope, from above. 



Plate XYI. 



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

 " 2. Same from below. 



Plate XYII. 



Fig. 1. Notliopsis rugosus Cope. 



2. Do. head from side. 



3. Bo. n u above. 



4. Bo. u u below. 

 .5. Dentition of upper jaw and palate. 

 6. TrigonocepliaHs atrox Cope, var. from Central America. 



u 

 u 

 u 



[February 13, 



