VERMES 



167 



.."•"■"• n Ji 



V.tV.C- 



Fig. 96.— Internal organs of the earthworm with alimentary and circulatory sys- 

 tems removed, eg, cerebral ganglia ; ds, dissepiment ;/, funnel of nephridium ; 

 np, nephridium ; o, ovary ; od, oviduct ;ph, pharynx ; r.s., seminal receptacle ; 

 s.d, sperm duct ; s.f, sperm funnel ; s.v.l, seminal vesicle ; t, testis, or sperm- 

 ary ; v.g and v.n.c, ventral nerve cord. (From Sedgwick and Wilson.) 



larged and pulsate rhythmically (Fig. 95). They take 

 the place of the heart of higher animals, and together 



