1914.] NATURAL SCIENCES OF PHILADELPHIA. 277 



BELONID^. 

 Potomarrhaphis guianensis (Schomburgk). 

 Two examples, 107 and 172 mm. 



SCI^NIDiE. 

 Plagioscion squamosissimus Meckel. 



One example, 295 mm. 



Pachypops furcraeus (Lac6pede). 



One example 148 mm, 



CICHLID^. 

 Acaropsis nasa (Heckel). 



Two examples, 60 and 110 mm. 



.ffiquidens tetranemus (Heckel). 



One example 80 mm. 



Cichlasoma severum (Heckel). 



Two examples, 125 and 160 mm. 



Mesonauta festivius (Heckel). 



Two examples, 115 and 108 mm. 

 Geophagus surinamensis (Bloch). 



Two examples, 170 and 112 mm. 



Geophagus jurupari Heckel. 



Two examples, 150 and 110 mm. 



Apistogramma ortmanni rupununi subsp. nov. Fig. 19. 



Head2|; depth 2f; D. XV, 7; A. Ill, 6, i; P. i, 11; V. i, 5; scales 

 22 in median lateral series to caudal base and 6 more on latter; 

 scales 12 in upper branch of 1. 1.; 4 scales posteriorly in lower branch 

 of 1. 1.; 3 scales between spinous dorsal origin and 1. 1.; about 8 

 scales transversely between origins of rayed dorsal and anal; 9 

 predorsal scales; head width 2 in its length; head depth at occiput 

 about 1|; snout 3; eye 3|; maxillary 3|; interorbital 4; mandible 

 2^; last dorsal spine 2; third dorsal ray If; third anal spine 2^; 

 third anal ray 1*; least depth of caudal peduncle 2^^; caudal 1; 

 pectoral \\; ventral spine 2|; ventral fin l\. 



Body rather elongately ovoid, well compressed, profiles similar, 

 and deepest midway in length of depressed pectoral, edges all convex. 

 Caudal peduncle well compressed, length about f its least depth. 



Head large, compressed, both profiles convex, upper more inclined, 

 and nearly flattened sides slightly converging above, so that lower 

 surface more broadly convex. Snout moderate, convex over surface 



