Oohince from the Amazon River. 47 



have been acute or pointed. Bat a single species has been 

 ascertained ; its habitat is unknown, but it is probably a Chinese 

 fish ; the color is a uniform dark or brownish bay. It will be 

 more fully described at an early date. 



Eiicfenog^obius badiiis, Gill. 



The elongated body is slender, with the height under the 

 first dorsal fin nearly uniform ; it there equals a seventh of the 

 extreme length inclusive of the caudal fin. Witli the com- 

 mencement of the second dorsal, the back commences to slope 

 downwards as far as the end of that fin ; the caudal peduncle is 

 then nearly uniform in lieight to the base of its fin, but near 

 that base its dorsal and inferior margins appear somewhat in- 

 flated from the recurrence upon them of the rudimentary rays 

 of the fin ; the height of the peduncle exceeds half of that at 

 the dorsal. The abdominal outline is nearly straight. A trans- 

 verse section at the pectorals exhibits an oval or ellipse. 



The scales are firmly adherent to the body ; there is an ave- 

 rage number of ten radiating ridges. The number of scales in 

 a row along the sides is about fifty, and from the dorsal to the 

 anus, there are about eighteen. 



The head from the snout to the opercular margin, forms little 

 more than a sixth of the extreme length of the fish. The curve 

 from the dorsal fin to the end of the scaly area is very slight, 

 but between the latter and the eyes there is a slight depres- 

 sion ; the height is there somewhat more than two-thirds of the 

 head's length. The greatest breadth equals the height at the 

 eyes ; the curve of the profile from the eyes to the snout is very 

 oblique. 



Behind the eyes, there is a slightly curved line of pores with 

 the convexity anterior ; a pore is also above each eye, and two 

 are on the upper half of the ascending margin of the pre-oper- 

 culum. There is also a diagonal line of bead-like pores on the 

 surface of the sub-operculnm, the angle of which line is at the 

 lower part of the ascending margin of the plate. 



