CHROMIDIA AND THE BINUCLEARITY HYPOTHESES. 295 
The formation of secondary nuclei from chromidia has been 
described in Lymphocystis (see Awerinzew, ’08). The 
same kind of nuclear phenomenon has, in addition, been 
described by Siedlecki (98) in Aggregata (Klossia, 
Eucoccidium, etc.), during the formation of sporoblasts 
and microgametes. Recently this has been challenged by 
Moroff (08), who has described most remarkable chromidial 
formations, centrosomes, etc., and based a number of specula- 
tions thereupon. I have been engaged in studying these 
parasites for some time past, and hope to be able to consider 
Moroff’s work in detail later. For the present I will merely 
Trxp-rie. 12. 
2 
Leys 
Formation of microgametes in Adelea ovata. (After Dobell, 07.) 
yy" 
say that, in most respects, my work so far confirms and 
amplifies that of Siedlecki. Moroif’s “chromidia,” etc., are 
to my mind in great part artifacts, due to defective cytolo- 
gical methods. 
The Gregarines furnish many examples of chromidia. 
Chromatin particles in the cytoplasm have been noticed by 
many observers, in many different species, for a long time 
past. They vary greatly in amount. A very good instance 
has been described and figured by Cecconi (’03) in Ancho- 
rina, but he was unable to discover their origin or signifi- 
cance (text-fig. 13). 
VOL. 03, PART 2.—NEW SHRIES. 21 
