- Opening of green gland 

 Antennule 



E ~ -Antenna 



Sixth abdominal appendage 



Mandible -i 



Third maxilliped I-* 



Subesophageal ganglion % 



Posterior portion of stomach 

 First thoracic ganglion 



First walking leg 



Right digestive gland 



Ventral thoracic-abdominal artery- 

 Sternal artery 



Right sperm duct Ipk 



Opening of sperm duct ^V 



First abdominal appendage - -"^~^15&|^^^ 



Second abdominal 



appendage ' 



Third abdominal appendage 



— Rostrum 



(^.Position of "ear" 

 --Eye 



Supraesophageal 

 ganglion 



- - Gastrolith 



Anterior portion 

 of stomach 



-Sto7tiach 



"teeth" 



Cephalothorax 



- -Anterior 

 median artery 



-Ostium 



Heart 

 Pericardium 

 Right spermary 



Dorsal 

 abdominal artery 



Intestine 



I {Abdominal muscle 



Abdomen 



-Anus 



Fig. 83. Dissection of crayfish. (Slightly enlarged) 



