MITCHILL ON THE FISHES OF NEW-YORK. 449 



3. Double-bearded Flying Fish. (Exoccetus furcatus.) With a dou- 

 ble cirrhus. 



The individual I examined was three inches long, with large eyes. 



Belly carinated on both sides ; but not serrated. Ventral fins ample 

 and placed about two thirds of the distance between the pectorals and 

 the vent. 



Two cirrhi or tough appendages, half an inch long, hanging from the- 

 6hin. 



Scales small and adhesive, forming a complete and durable covering 

 for the back and sides, and arranged in rows that may be counted. 



POLYNEMUS. 



Generic Character. 



Head compressed, covered with scales, snout very obtuse and promi- 

 nent. Gill membrane five or seven rayed. Separate filaments or seta- 

 ceous processes near the base of the pectoral fins. 



Three-fingered Polyneme. (Polynemus tridigitatus.) The individual 

 I examined belonged to this genus, and had three appendages from the 

 anterior part of the thorax. 



CLUPEA. HERRING. 



Generic Character. 



Side plates of the upper mandible serrated. Gill membrane eight 

 rayed. Gills internally setaceous. Abdomen sharp and generally ser- 

 rated. 



* With serrated bellies. 



1. Shad. (Clupea alosa.) With dusky back, shining sides, deciduous 



59 



