FISHES. 385 



trusile. Belly compressed and denticulated. The follow- 

 ing subgenera have been indicated : 1. Clupea (C. Ha- 

 rengus *). 2. Megalops (C. cyprinoides). 3. Engraulis 

 (C. encrasicolus). 4. Mystus (C. atherinoides). 5. Gna- 

 thobolus (G. mucronatus). 6. Pristigaster, CUVIER. 7. 

 Notopterus (Gymnotus notopterus of PALLAS). 



37. ELOPS. About thirty rays in the gill-flap. Belly 

 not denticulated. A strong spine on the dorsal and ven- 

 tral edges of the tail. E. saurus. 



38. CHIROCENTIIUS. The two middle teeth above and 

 all below much produced. Above each pectoral fin a long 

 pointed scale. Belly sharp. C. vulgaris. 



39. EIIYTHRINUS. Head without scales, hard. Dorsal 

 and ventral fins opposite. Teeth irregularly large. Gill- 

 flap of five rays. E. malabaricus. 



40. AMI A. Like the preceding, but with twelve flat 

 rays in the gill-flap. A calva* 



41. SUDIS. Dorsal and anal fins opposite. Two species 

 are known. 



42. LEPISOSTEUS. Body covered with osseous scales. 

 Gills united at the throat, and the gill-flap with three rays, 

 L. osseus. 



43. POLYPTERUS. Gill-flap with one ray. Body with 

 osseous scales. P. bichir. 



b. Upper jaw formed by the intermaxillaries. The max- 

 illaries are without teeth, and concealed in the lips. M. 

 CUVIER divides this group into three families. The first, 

 represented by the pike and carp, is indicated by the pre- 

 sence of scales, while in the two last the skin is either naked, 

 or furnished with osseous plates. 



ESOCIIXE. Furnished with strong teeth. 



* A figure of Clupea alosa or Shad, is given in Plate III. f. 1, 

 VOL. II. B b 



