FEEDING AND BREATHING 



33 



Fig. 12. — Lateral Dissection of Worker Honey Bee (Apis mellifica), 

 showing Nerve-cord (nc) and Circulatory and Respiratory Systems. 

 ts, tracheal sacs connected with air-tubes, h, heart, with its paired 

 slits (ostia) oSy surrounded by pericardial blood-space {pc) ; dd, dorsal and 

 W, ventral diaphragms ; a, aorta.; o^, optic lobe of brain ; mJ, mandible. 

 X lo. After R. E. Snodgrass, 1910. 



