EARTHWORMS. PHYLUM ANNELIDA 



body and are probably affected by light. Experiment shows that 

 the worn>s are sensitive to light and to vibrations of the ground, 

 and can smeU, but gives no evidence of a sense of hearing. 



REPRODUCTION 



Earthworms are hermaphrodite, every individual having a com- 

 plete set of organs of each sex (Figs. 121, 131). The female organs 



C.V.S'.r-.- 



P 



.v.s:~z 



Fig. 121. — An earthworm (L. terrestris), dissected from above. 



avs' Horns of the anterior vesicula seminalis ; cr., crop; d.b.v. dorsal blood vessel; giz., gizzard; 

 itt. heart-. ; irtL, intestine ; m., mouth ; nph., nephridia ; oss., oesophagus ; as.g, oesophageal glands ; 

 as.p., « >1 pouch ; p.v.s'., horns of the posterior vesicula seminalis ; ph., pharynx ; sep., septa ; 



V* =.-'.,-■ ■; .?H^./'/'.e., suprapharyngeal ganglia. 



