THE PROTOZOA PARASITIC IN ARCHOTERMOPSIS WROUGHTONI 261 
the blepharoplast (centroblepharoplast) first divides, followed 
by a split in the protoplasm. The chromatin blocks of the 
nucleus become resolved into granules, which aggregate to 
formaspireme. These phases have been foundin P. pristina. 
Hartmann’s further account, however, of the degeneration 
of the primary nucleus and the formation of secondary nuclei, 
with the final appearance of gametes, finds no counterpart in 
the animal I have investigated. In one important respect 
the nuclear division deseribed by Hartmann differs from that 
of P.pristina. In this species there is no trace of parades- 
mose or spindle fibres, whereas Hartmann figures both these 
structures. This is a point of interest, for in all the protozoa 
of Archotermopsis, which I have investigated, the 
division centres of the nucleus are either absent or poorly 
developed. 
Thus in Ditrichomonas termites (2) a paradesmose 
is formed, but no spindle fibres, centrioles, &c., whereas in other 
Trichomonads they are described by Kuezynski (19) and 
Kofoid and Swezy (16). In Joenopsis polytricha (2) 
nuclear division occurs without any obvious centre, which is 
not the case in any of the related animals ; for in Joenia (18) 
and Parajoenia (18) a spindle is formed. Finally, as 
already noted, the Pseudotrichonymphid described 
by Hartmann has a paradesmose and spindle fibres; as is 
also the case in Trichonympha major and minor 
described by Foa (4). In P. pristina such structures are 
entirely lacking. 
Thus in all the protozoa examined from the gut of 
Archotermopsis wroughtoni the nuclear division is 
very different from that found in related species. 
Further, in D. termites the nuclear division and the 
locomotor complex is of a more primitive nature than 
that described for other Trichonomads ; a statement probably 
true for Joenopsis polytricha and Pseudotricho- 
nympha pristina. It appears that the protozoa to 
which A. wroughtoni is host are in general more primi- 
tive than those inhabiting other species of termites. Imms 
7 2 
