214 



COLLEGE ZOOLOGY 



It is interesting to compare the echinoderm larva with that 

 of a supposed primitive chordate, the Tornaria of Balanoglossus 

 (Chap. XIV, Fig. 334). The remarkable similarity of these 

 larvae suggests that chordates (Chap. XIV) and echinoderms 

 may have had the same or similar ancestors (see also Chap. 

 XXII). 



