124 



ZOOLOGY 



C 2 . Last pair of thoracic legs not shoved 



backward. 



6?i. Antennae without squame ; first pair 

 of thoracic legs chelate ; cephalo- 

 thorax with 2 longitudinal lines . 

 d%. Anteniue with squame. 



e\. ISquame small ; antennules and 

 antennas near each other ; first 

 pair of thoracic legs very heavy 

 with great chelae ; cephalo- 

 thorax with cross-suture ; gills 

 brush-like 



6> 2 . Squarne large ; antennas usually 

 under antennules ; first pair 

 of thoracic legs with small 

 chehe ; cephalothorax without 

 cross-suture, gills laminate 



ThalassimdcB 



Astacidcb 



(Ex. Craylish) 



C arid idee 



(Shrimps and Prawns) 



n-2. 2 pairs of maxillipeds resembling the 6 following 

 pairs in being bifid [suborder Schizopoda]. 



