292 LILIAN SHELDOIif. 



was present on the surface of the egg, which projection may 

 have signified the point of entrance of a spermatozoon. 



12. A small spindle appears at one point at the periphery of 

 the egg. A male pronucleus is present at the opposite side ; 

 it is very small, with a few small chromatin particles and a 

 radiate arrangement of the protoplasm round it. 



13. The spindle divides, forming a polar body, a second being 

 subsequently formed in the same way. The process is appa- 

 rently one of normal indirect nuclear division. 



14. The remainder of the spindle remains in the egg as the 

 female pronucleus. It lies a little distance from the surface, 

 and is lobed. The male pronucleus is a large round body 

 lying near the centre of the ovum, and in P. capensis is 

 connected with the side removed from the female pronucleus 

 by a wedge-shaped mass of protoplasm, which is denser than 

 that of the rest of the egg. 



15. The two pronuclei approach the centre and lie close 

 together. They are both lobed (only observed in P. 

 Balfouri). 



16. They probably conjugate, though the process has not 

 been observed. 



17. The resulting nucleus, which is the first segmentation 

 nucleus, passes to the periphery. It is large and lobed, and 

 soon becomes surrounded by a large mass of dense protoplasm. 



Summary of Events in the Maturation of the Ovum 

 of Peripatus Novse-zealandiae. 



1. The ovary resembles that of P. capensis in structure. 

 Spermatozoa are present in the receptacula seminis and not 

 in the ovary. Yolk was present in the ovary in one case. 



2. The ova arise by a growth of any of the cells of the 

 germinal epithelium. They are attached to the ovary by 

 stalks which are formed from the cells of the germinal epithe- 

 lium. 



3. The nucleus of the ovum is at first coarsely granular and 

 contains a nucleolus which is placed almost centrally. 



