207 



axe 



1 I 



(T D 



""^ 



Figure 159: Ophiothrix fragilis (McBride, 1907). 



Separation of hydro- and axocoel. Formation of primary evaginations of hydrocoel. 



axe — axocoel; he — hydrocoel. 



Figure 160: Ophiocoma scolopendrina (Mortensen, 1937). 



Formation of vibratile lobes. 



vl — vibratile lobes. 



