NATURAL SCIENCES OF PHILADELPHIA. 257 



lobe shorter than inferior. Orbit entering bend (witli chin) four 

 times, in muzzle once, neai'ly double interorbital space. Pectorals 

 reaching beyond basis of veutrals. Cranial ridges forming a 

 closed V in front. Length of head equal greatest depth of body, 

 entering length S.tS times (excl. caudal fin). 



Total length .186 m ; to basis of anal .093 (axial); do. ventral 

 .061. 



Silver with golden and green reflections, yellow on side of head, 

 a black epiclavicular spot. 



From the Ambyiacu. The second South American species, 

 which is found at a great distance from salt water. 



OSTEOGLOSSIDiE. 



OSTEOGLOSSUM BICIREHOSUM, Vand. 

 Three specimens ; in one the anal and caudal fins are united. 



STERNOPYGIDiE, 



This family differs materially from the Gymnotidse^ with which 

 its species have been heretofore arranged. One character is to be 

 seen in the construction of the scapular arch. The coracoid bone 

 is well developed, and connected by the transverse column with 

 the clavicle, as in many other physostomous families. In the 

 Gijmnotidse this column is wanting, and the coracoid is rudi- 

 mental. 



STERNOPYGUS MACRUKUS, Cuv. 



STERNOPYGUS VIRESCENS, Valenc. 

 CARAPUS FASCIATUS, Pallas. 



ERYTHRINIDiE. 



MACRODON TRAHIRA, Bl. Schn. 

 Giinther, Catal. v. 281. 



HOLOTAXIS IJETUS, Cope, sp. nov. 



Form elongate, scales very large, 1. 1. 26, 1. tr. 5. Length head 

 four times depth body, also four times in length without caudal 

 fin. Orbit 3.3 times in length of head. Chin very prominent ; 

 maxillary teeth as large as the premaxillaries. Dorsal fin distant 

 from muzzle 1.5 times distance from caudal. Radii D. I. 9 ; A. 

 1872.] 



