50 



THE BIOLOGY OF AN ANIMAL, 



10. 



15. 



Fig. 24.— Dorsal view of the anterior part of the body of Lumhricus, as it appears 

 when laid open along the dorsal aspect, ao, aortic arch ; c, crop ; eg, cerebral 

 ganglia ; c.gl, calciferous glands ; d, dissepiment ; d.i\ dorsal vessel ; g, gizzard ; 

 CB, oesopnagns ; ph, pharynx ; ps, prostomium ; s.i, stomach-intestine, showing 

 the lateral pouches; s.r, seminal receptacles; s.v.^, s.v.^, s.v.^, the three pairs of 

 lateral seminal vesicles. 



