FURTHER DATA ON THE REDUPLICATION IN SILICWORMS. 
'5 
the nonml-niarkcd ones besides the striped and plain-marked specimens. 
This is contrary to the actual results, F.j generation practically in\olving 
stripecls and plains but no individuals normally marked. Thus we are forced 
again to assume a reduplication, namely, complete coupling between S and N. 
The same thing may be said as regards the relation of the formulae 
MMnn and MMNN i. e. we must assume complete repuslion between M and 
H foi' MMnn system, and complete coupling between them for MMNN view. 
On the striped and moricaud larvae the normal marking (''eye-spots" 
and "lunules") co-exists with that marking which is characteristic of the 
striped or the moricaud. This fact seemingly points to the SSNN and 
MMNN formulae. But it is, at the same time, not unreasonable to suppose 
that the normalness actually partakes of the striped or the moricaud marking, 
the characteristic being freely developed by S- or M-factor in absence 
of N as well as in presence of it. 
We are, as these comparisons show, unable to determine, at present, 
which of the formulae above stated are more adequate. Therefore I will 
prefer, until more positive evidence to the contrary is obtained, the ex- 
pressions SSnn and MMnn which were adopted in my previous papers. 
Fchniary igi^. 
Agricultural College, 
Tohoku Imperial University, 
Sapporo. 
