476 EIOHARD EVANS. 



in these cells probably represents a stage between the cells h and c of 

 Fig. 40. 



Figs. 42, 1 a — 10 a. — X 1000. Various stages of mitotic division found in 

 the cells of the free-swimming larva and of the young sponge. See Appendix 

 E, pp. 434, 435. 



