VISCERA OF CATERPILLAR. 353 



of the alimentary canal. It is sufficient to contrast this arrangement 



Fig. 178. 



Viscera of a Caterpillar: g h, oesophagus; h i, stomach; k, hepatic vessels; I m, intestine ; 

 q,r, salivary glands; p, salivary duct; a be, longitudinal tracheal trunks; d,eeee, air-tubes 

 distributed to the viscera; ///, the epiploon or fat-mass; v xy, silk-secretors ; z, their ex- 

 cretory ducts, terminating in t, the spinneret orfusulus. 



2 A 



