90 



THE EVOLUTION OF MAN. 



kingdom as a genuine Worm. The difi'erence between it 

 and other genuine Worms cannot have been greater than is 





v.d; 



^-(y 



'm. 



Fio. 187. — Append icularia, seen from the left side : m, montli ; k, giU- 

 intestine ; o, oesophagus ; v, stomach ; a, anus ; n, nerve-ganglia (nppex 

 throat-knots) ; g, ear-vesicle ; /, ciliated groove under the gill j fc, heart f 

 (, testes ; «, ovary ; c, notochord ; «, tail. 



Fig. 188. — Structure of an Ascidian (seen from the left, z» in Fig. 153 

 and Fig. 14, Plate XI.) : sb, giU-sao j v, stomach ; t, large intestine j c, 

 heart ; t, testes ; vd, seed-duct ; o, ovary j o\ matured eggs in the body. 

 oavitj. (After Milne Edwards.) 



