18 LILIAN SHELDON. 
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 Nove-zealandiz. 
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- 
hum. 
3. The nucleus of the ovurn is at first coarsely granular and 
contains a nucleolus which is placed almost centrally. 
