TWAITK SUA I). 



181 



ABDOMINAL 

 MALACOHTEHVail. 



CLUFEIDA=:. 



THE TWAITE SHAD. 



Alosajinla, Cuvier, Regne An. t. ii. p. 3'20. 



,, ,, WlI.LUGHBY, pi. P. 3, fig. 1. 



,, La Feinte, Duhamel, sect, iii.pl. 1, fig. 5. 

 Clupea alosa, Linn^us. Block, pt. i. pi. 30. 



,, Shad, Penn. Brit. Zool. vol. iii. p. 4G0, pi. 80. 

 ,, ,, ,, Don. Brit. Fish. pi. 57. 



,, ,, ,, Fli£m. Brit. An. p. 183, sp. 53. 



Generic Characters. — Upper jaw with a deep notch in the centre ; in other 

 respects like Clupea. 



Baron Cuvier, in the last edition of the Regne Animal^ 

 lias advanced the Shads, of which we have two species, to the 

 rank of a genus, on account of the deep central notch in the 

 upper lip ; and I have followed this example for the addi- 

 tional reason that it will the more easily and effectually 

 afford the means of obtaining a desirable alteration in our 

 nomenclature. 



According to Cuvier, most modern authors have misap- 

 plied llie systematic trivial names of these two species, call- 

 ing the Shad with teeth, and several spots along each side, 

 C. nio.sa ; and the larger Shad without teeth, and with a 



