214 C. CLIFFORD DOBELL. 
(Cf. similar results obtained with the amceba and coccidia, 
p- 253, ete.) 
According to Prowazek (78), the division of T'richomastix 
lacerte differs from that which I have just described. It 
appears from his account that the axostyle is drawn up 
_towards the nucleus and then rearranges itself at right angles 
to its original position—passing through a T-shaped phase 
in doing so. The connection of the axostyle to the blepharo- 
plasts was not made out. When the rod is rearranged the 
nuclear chromatin travels in two masses to each of its ends. 
The axostyle thus appears to function as a kind of division 
centre. From my own observations on this organism I 
believe that its structure and method of dividing are identical 
with those just described in TI’. batrachorum. But unfor- 
tunately I have found only a very few stages in division, so 
that I may be wrong. Some of Prowazek’s figures, however, 
also support my interpretation (cf. figs. 8, 10, Pl. 1 [73]). 
The method of division which I have elsewhere described 
in T. serpentis (56) also differs considerably from that of 
T. batrachorum. As my observations were made chiefly 
on living organisms, it is possible that I misinterpreted what 
I saw. Nevertheless I was able to watch division many 
times with great clearness, and believe the figures and des- 
cription I have given are substantially correct for the living 
animal. The presence of a filament connecting the 
blepharoplasts after division may, however, have escaped 
my notice. 
Prowazek (73) has described an autogamy in the cysts of 
T.lacerta, but I have never seen anything at all like it in 
T. batrachorum. ‘The cysts of the former species seem to 
be totally different in every way. 
(b) Trichomonas batrachorum Perty. 
Syn. : [? Bodo ranarum Ehrenberg, 1838]. 
Monocercomonas batrachorum Grassi, 1879. 
