224. CG. CLIFFORD DOBELL. 
equally to ordinary trypanosomes. Indeed, the careful work 
of Salvin-Moore and Breinl on a true Trypanosoma show 
that quite a different arrangement exists here. ‘Vhe blepharo- 
plast in IT. gambiense does not appear to be a nucleus 
containing a division centre lke that in H. noctue. Itis 
quite possible that in forms like H. noctue the ‘ blepharo- 
plast”’ is really a specialised nucleus! which is in connection 
with the real blepharoplast. ‘There are many cases known, 
moreover, in which one solitary nucleus gives rise to the 
flagella (cf. Plenge [72], etc.). 
It is difficult to believe, from their structure, that the 
blepharoplast of Trypanosoma and that of ‘T'richomonas 
(cf. fig. 16, Pl. 2) are not homologous. And obviously the 
blepharoplast of Trichomastix is homologous with that of 
Trichomonas (cf. figs. 1 and 16). But then, again, it 
appears more than probable that the blepharoplast of the 
trichomonads is homologous with a centrosome (cf. figs. 6, 
21—especially the latter). When the case of sperms is 
considered in addition, the homology appears to me almost 
established. 
I do not for a moment suppose that either of these structures 
—blepharoplast and centrosome—is derived necessarily from 
the other. They are, according to my view, merely homo- 
logous organs—both originally, in all probability, derived 
from the nucleus. Their morphological similarity depends 
upon their physiological identity. Their nuclear derivation 
is seen, in many cases, in their staining reactions. 
These points seem to me to be very clearly brought out in 
' Since writing the above remarks, I have been pleased to find that 
my view fits in exceedingly well with the observations of Minchin (68). 
I think his view really corresponds exactly with mine, namely, that we 
may have, in connection with the locomotory organs, a specialised 
nuclear apparatus which is really to be regarded as kinetonucleus + 
blepharoplast. Minchin agrees with Keysselitz and others in word 
only—not in idea. For him there are two structures at the base of the 
locomotor apparatus—a kinetonucleus and a blepharoplast of a 
centrosomic nature. Of course, it does not in the least follow that 
all trypanosomes are built on the same plan as those in tsetse-flies. 
