90 



THE EVOLUTION OF MAN. 



kingdom as a genuine Worm. The difference between it 

 and other genuine Worms cannot have been greater than is 



vA 



V.3,: 



Fig. 187. — Appendicularia, seen from the left side: m, montli; S, gill- 

 intestine ; 0, oesophagus ; v, stomach ; a, anus ; n, nerve-ganglia (upper 

 throat-knots) ; j, ear-Tesicle ; /, ciliated groove under the gill ; Ti, heart ; 

 t, testes ; e, ovary ; c, notochord ; s, tail. 



Fig. 188. — Stmcture of an Ascidian (seen from the left, as in Kg. 153 

 and Fig. 14, Plate XI.) : sb, gill-sac ; v, stomach ; i, large intestine ; c, 

 heart ; t, testes ; vi,, seed-duct ; o, ovary j a', matured eggs in the body, 

 cavity. (After MUne Edwards.) 



