PLANKTONIC LARVAE 



doliolids: see p. 80) are more than reminiscent of the tadpoles of frogs as 

 they show, far more easily than the adults, their primitive Chordate affinities, 

 with gill slits, endostylc and notochord. They are not very often taken in the 

 plankton as their free life is very short, only six to twenty-four hours, but 

 they can be found in collections made close to the rocky shore in middle or 

 late summer. 



95 



