ALLIS SHAD. 121 



gill-covers adorned with branched lines — perhaps mucous ducts. 

 The usual hooked serrations along the line of the belly. Dorsal 

 fin over the ventrals, with twenty rays; the first two short; 

 pectorals eighteen; anal fin narrow, twenty-one rays, the last 

 two from one root; ventrals nine rays. Colour of the back blue, 

 upper jiortion of the head brown; light golden tints on the 

 gill-covers and about the upper parts round the eye, tints of 

 blue and pink reflect on the sides, silvery below; a large 

 black spot close behind the upper border of the gill-covers. 

 Pharyngeal bones very slightly rough. 



VOL. IV. 



