AMPHIBIA, REPTILES, OTHER CHORDATES 99 



fonn completely independent dwarf larvae, or else they 

 are only slightly separated so that they cease to act in 

 unison and become physiologically isolated so as to form 

 double gastrulae and double-monster larvae. The condi- 

 tions are quite like those described for the starfish, 

 Patiria. 



