430 Mr Dobell, On the Intestinal Protozoan 
like the nuclear chromatin. The relations of the axial rod are the 
same as in Trichomastix. 
Multiplication occurs in exactly the same manner as in Tricho- 
mastix, save for the fact that the undulating membrane is probably 
multiplied by splitting — and not by a new growth, as in the case 
of the posterior flagellum. The behaviour of the blepharoplast 
and axial rod is exactly the same as in Trichomastix. 
Hence my observations on the division of the trichomonads 
are very different from those of former investigators — e.g. Prowazek 
and Wenyon. 
Trichomonas forms cysts which closely resemble those of Tricho- 
mastix, and in a closely similar manner. In the early stages, the 
nucleus (which also develops a karyosome) is visible as an oval 
structure, from which the axial rod passes backwards. Lying 
beside the nucleus are to be seen the darkly-staining edge and 
basal rod-like support of the undulating membrane. The flagella 
are lost, and the blepharoplast remains as a small diplosomic body 
upon the nucleus. At a later stage, the remains of the axial rod 
and undulating membrane disappear, and the nucleus becomes 
elongated, so that it is impossible to distinguish these cysts with 
certainty from those of Trichomastix. No further development 
has been observed. 
I have seen no signs of any sexual process in these monads — 
nothing that in any way tallies with the conjugation noted by 
Schaudinn in T. intestinalis. 
(3) Octomitus sp. (= Hexamitus, Dicercomonas, &c. 
of other writers). 
Under this name I will describe the 8-flagellate monad which 
is frequently found in frogs and toads. No accurate description of 
this organism has yet been given. 
Although very small (about 10 /a long) it has a complicated 
structure. The shape of the body is a long oval, with the nucleus 
lying at the anterior end. The nucleus itself and its connexions 
are very complex, and do not appear to be always the same. 
A common condition is as follows : — At the extreme anterior end 
of the organism are two minute chromatin granules, lying side 
by side, and connected by a fine chromatic thread. From each 
granule a flagellum arises. Situated immediately behind this 
pair of granules, and connected with them by chromatic filaments, 
is another and a larger pair. To this pair are connected (1) a 
pair of flagella (on either side), (2) a large lobe of chromatin (one 
on either side) forming the main part of the nucleus, and (3) two 
axial rods. One rod passes backwards from each granule, and 
ends in another chromatic granule at the extreme posterior end 
