1906.] 



NATURAL SCIENCES OF PHILADELPHIA. 



299 



Natural Sciences of Vienna, as a slight recognition of his thoroughly 

 excellent contributions to Ichthyology.) 



Curimata trachystethus (Cope). Fig. 5. 



Curimatus trachystethuf Cope, Proc. Amer. Philos. Soc. Phila., XVII, 1877-7S 

 (May 17, 1878^, p. 684. No. 21,470, A. N. S. P., type. Peruvian Amazon, 

 probably from Pebas. Prof. J. Orton. Coll. of 1877. 



Width of head If in its length ; width of mouth 3f ; interorbital space 

 2f. Body well compressed. Head convexly restricted below and 

 broad above. Snout broad and obtuse in profile when viewed from 

 above. Mouth broad. Jaws and lips thin. Mandibular angle very 

 obtuse and with a little protuberance at symphysis fitting in a depres- 

 sion in front of upper jaw. Tongue a little narrow, median, rather 





^^9.^^^-^:;^ 



Curimata trachystethus (Cope). 



far back, and little free in front. Interorbital space broadly convex 

 and more or less flattened medianly. Gill-opening large and extending 

 forward till about opposite posterior margin of pupil. No rakers. 

 Filaments a trifle more than half of orbit. Isthmus rather broadly 

 triangular. A short pointed scaly flap in axil of pectoral. Predorsal 

 region with a median rounded keel. Postdorsal region rounded. Pre- 

 ventral region flattened. Postventral region with a median obtuse 



