THE PRAWNS. 269 



sitiun, are in fact the same. But, in the prawn, the abdomen 

 is much larger in proportion to the cephalothorax ; the 



B 



FIG. 71. Pal&mon jrrmaicpnfri* (about 4 na -k size). A, female; 

 B, filth thoracic appendage of male. 



basal scale, or expedite of the antenna, is much larger ; 

 the external maxillipedes are longer, and differless from the 

 succeeding thoracic appendages. The first pair of these, 

 which answers to the forceps of the crayfish, is chelate, 

 but it is very slender ; the second pair, also chelate, is 

 always larger than the first, and is sometimes exceedingly 



