FISHES FROM PERU HILDEBRAND AND BARTON 



Other American species recognized by Hubbs in his revision (1944, 

 pp. 162-178), as shown in the parallel comparison that follows. 



The species was named for Samuel Ordway, the judicious trustee 

 of the New York Zoological Society. 



barbaia 

 Body quite elongate, its 

 depth 5.5 to 6.0 in 

 standard length. 



Head low, somewhat 

 flattened above, its 

 depth at margin of 

 preopercle 6.6 to 6.9 

 in standard length. 



Mouth large, the maxil- 

 lary reaching well be- 

 yond posterior rim of 

 orbit, 2.0 to 2.1 in 

 head; jaws of about 

 equal length. 



Vomerine teeth in a tri- 

 angular patch, each 

 arm of triangle with 

 a constriction, nearly 

 but not quite pinching 

 off a posterior patch. 



Origin of dorsal behind 

 base of pectoral, its 

 distance from tip of 

 snout 3.6 to 3.8 in 

 standard length. 



Origin of anal at mid- 

 length without caudal 

 fin, its distance from 

 tip of lower jaw 1.9 

 in standard length. 



Ventral fins rather long, 

 the longest filament 

 reaching a little be- 

 yond base of pectoral, 

 1.8 to 2.2 in head. 



Pectoral fin reaching 

 much less than half- 

 way to origin of anal, 

 8.4 to 8.8 in standard 

 length, with 24 or 25 

 rays. 



clarkae 

 Body quite elongate, its 

 depth 5.9 in standard 

 length. 



Head low, somewhat 

 flattened above, its 

 depth at margin of 

 preopercle 6.7 in stand- 

 ard length. 



Mouth large, the maxil- 

 lary reaching rather 

 far beyond eye, 2.0 in 

 head; lower jaw 

 slightly longer than 

 the upper. 



Vomerine teeth roughly 

 in a triangular patch, 

 rounded at apex, arms 

 of triangle without a 

 constriction. 



Origin of dorsal behind 

 base of pectoral, its 

 distance from tip of 

 snout 3.6 in standard 

 length. 



Origin of anal a little in 

 advance of midlength 

 without caudal fin, its 

 distance from tip of 

 lower jaw 2.1 in stand- 

 ard length. 



Ventral fins long, reach- 

 ing about an eye's di- 

 ameter beyond base of 

 pectoral, 2.1 in head. 



Pectoral fin reaching 

 about halfway to ori- 

 gin of anal, 8.3 in 

 standard length, with 

 27 rays. 



ordwayi, new species 

 Body deeper, its depth 

 4.4 in standard length. 



Head more convex 

 above, its depth at 

 margin of preopercle 

 6.0 in standard length. 



Mouth smaller, the max- 

 illary reaching under 

 posterior rim of orbit, 

 2.25 in head; lower 

 jaw notably shorter 

 than upper, included. 



Vomerine teeth in a 

 broad triangular patch, 

 approaching the shape 

 of a U, the arms with- 

 out a constriction. 



Origin of dorsal defi- 

 nitely in advance of 

 base of pectoral, its 

 distance from tip of 

 snout 4.0 in standard 

 length. 



Origin of anal rather far 

 in advance of mid- 

 length without caudal 

 fin, its distance from 

 tip of lower jaw 2.4 in 

 standard length. 



Ventral fins short, 

 the longest filament 

 scarcely reacliing base 

 of pectoral, 3.1 in 

 head. 



Pectoral fin scarcely 

 reaching halfway to 

 origin of anal, 8.7 in 

 standard length, with 

 23 rays. 



