35 



ASTACUS 



10. The same crayfish with all its viscera removed except the green glands which lie right and left of the 

 mouth. The muscles of the tail and the false bottom of the thorax have also been removed. Supra-ossophageal 

 ganglia ; circum-cesophageal connectives ; six ventral ganglia of the cephalo-thomx ; sternal artery passing between 

 cephalo-thoracic ganglia 4 and 5 ; six ganglia of the abdomen ; green glands ; sacs of green glands. 



