INYEETEBEATA. n 



FIG. III. 



VENTEAL ASPECT OF THE EAETH WORM. 



(LUMBRICUS TEREESTEIS.) 



AFTER removing the ventral parietes the nerves are seen passing on each side of 

 the ossophagus from the brain to the nervous cord. A bloodvessel is seen passing 

 on the nervous cord throughout its whole length ; the large ventral bloodvessel is 

 seen, and its communications with the membranous sacs, or hearts. 



FIG. IV. 



THE LEECH. 



(HIRUDO MEDICINALIS.) 



THIS figure shows the brain of the leech placed above the ossophagus, and the 

 nerve passing from it on each side of this canal to the first ganglion ; the nervous 

 cord is seen extending throughout the length of the body on the ventral parietes, 

 and its several ganglia sending off nerves to the contiguous parts, 



C 2 



