Postelsta 
No 
on 
“i 
plant maintains through hfe a form very near 
the primitive type of kelp structure, there is 
Hot wn this case the imeerest attached fo the 
tracing out the development of a complex 
adult form like Egregia from the simple juvenile 
form that there is in the more specialized forms 
The young forms are very much like the older 
except in size and the tissues of the adult are 
already developed in plants as small as the 
smallest in the writer’s possession. As in other 
kelps the juvenile forms of this species may 
be recognized quite readily at least when no 
smaller than 5 centimeters. At that time they 
are clearly differentiated from most species by 
the absence of the characteristic marks which 
distinguish other genera. They are most sim- 
ilar to Nereocystis and the similarity does not 
disappear, though they become easily distin- 
guishable, until the lamine of that genus begin 
to divide. In smaller specimens they may be 
distinguished by the beginning of the pneumat- 
ocyst of Nereocystis which is discernable in 
plants of about 3 centimeters. In specimens 
smaller than that it seems doubtful to me 
