THE PRAWNS. 



269 



sition, are in fact the same. But, in the prawn, theabdomen 

 i s much larger in proportion to the cephalothoraxj the 



Fig. 71. Paltenum jamaieensh (abnnt 4 nat. sizeV A, female ; 

 B, fifth thoracic appendage of male. 

 2..T 



basaj^gcale, or expodite of the antenna, is much larger ; 

 the exter nal maxil lipedes are longer, and differ less from the 

 succeeding thoracic appendages. The fi rst pai r_of these, 

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

 but it is very slender ; the seeonjLpajr, also chelate, is 

 always larger than the first, and is sometimes exceedingly 



