'34 



ASTACUS 



8. Dorsal aspect of a crayfish from which the carapace and the abdominal terga have been removed : heart, 

 with two dorsal ostia ; testis or ovary ; stomach ; hepato-pancreas ; intestine ; muscle of the mandible ; great longi- 

 tudinal muscles. 



In injected specimen: ophthalmic artery; antennary artery; gastric artery; dorsal abdominal artery. 



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4^1 



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* v A* 



AAHMAtALA 



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9. Alimentary canal removed from body and seen from the side : oesophagus ; stomach ; mesenteron ; dorsal 

 ccecum ; hepato-pancreas ; rectum. 



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