MONILIGASTER GRANDIS, A. G. B. 353 
adult as shown by the generative organs; even then there is a 
variation of at least 25 per cent. of the total length between 
adult individuals of the same species. ‘This variation does not 
depend upon age, there are long individuals and short indivi- 
duals as in the human species. I have proved this by observa- 
tions taken at the time of hatching; at this time and indeed 
long before, growth by the addition of new segments has 
ceased while there is considerable variation in the number of 
segments—and the adult length depends, given an equal amount 
of contraction, solely upon the number of segments. The 
well-known phenomenon of regeneration of tail segments must 
be mentioned in this connection ; where the original tail has 
been injured the number of new segments which may form 
seems to be about the same as the number lost, as in any 
species the total number varies only to the extent of the usual 
percentage, whether the individuals have regenerated tails or 
not. I give a tabular statement for M. sapphirinaoides. 
The specimens were part of the same collection, from the same 
spot, and it was from this same collection that the nine speci- 
mens described below as varieties of this species were taken. 
The specimens in both cases were taken at random. 
