TWAITE SHAD. 131 



ABDOMINAL 



MALACOPTERYGll. CLUPEIDjE. 



THE TWAITE SHAD. 



Alosafinta, Cuvier, Regne An. t. ii. p. 320. 

 ,, ,, WiLLUGHBY, pi. P. 3, fig. 1. 



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

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



,, Shad, Penn. Brit. Zool. vol. iii. p. 460, pi. 80. 

 Don. Brit. Fish. pi. 57. 

 ,, ,, ,, Flem. 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, 

 has advanced the Shads, of which Ave 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 eflPectually 

 afford the means of obtaining a desirable alteration in our 

 nomenclature. 



According to Cuvier, most modern authors have misap- 

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

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

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



