A Segmented Worm — Earthworm 385 



Aiouth 



Circumpharyn- 

 geol ring 



Mephndiurri- 



Seminal 



receptacle \y 



Seminal 



vesicle 



-Frojtomum 



Bra\n 



_ Pharynx 



. Pbaryrii^eal 

 muscles 



Esophagus 



Heart 



Caldferous 

 cjland 



Crop 



Cji^^ard 



Dorja] hhod 

 yessel 



.Jntestine 

 _ Septa 



Fig. 185. — Earthworm (Lumbricus terrestris) dissected from the dorsal side to 

 show internal structures of the anterior end somewhat diagrammatically. I, V , 

 X, XV, Number of segments or somites. Nephridia are shown only in a few 

 segments. There may be slight variations in the location of certain structures 

 in different earthworms. 



