PLATE XV 



Fig. 2K. — Section of a mature ovicell of 0. eburnea, in which the larva? out- 

 number the embryos. The primary embryo (prim, cmh.) lies at 

 the distal end of the ovicell, still giving off buds [sec. emb.). 

 200 



Fig. 29. — Section of an ovicell of C. occideiltalis, showing the formation of 

 tertiary embryos ( Icr. cmh. ), and the large amount of follicle (fl.) . 

 Tertiary embryos are forming from a number of budding centers 

 [hil. c), which are large secondary embryos. 250 



Fig. 30. — A single budding centre or secondary embryo from another ovicell 

 of C. occidentalis, in which the two tertiary embryos {Icr. emb.) 

 are forming. 2500 



Fig. 31. — The primary embryo of Fig. 28 drawn to the same magnification 

 as that of Fig. 27, to show the reduction in size of the former. 

 300 



