
51 

logy of Tetrachilomastix and Chilomastix, it | by CHALMERS & PEKKOL Mesa Le cane 
will be easy to see what they have in com- 
mon and: how they differ. E see nothing that fident that the present arguments will ent 
justifies the confusion of the two genera | "ely dispel it. 
Table showing morphologic differences between: 
Tetrachilomastix Chilomitus | 
… Periplast: narrow and flexible, allowing Periplast : absolutely rigid, though not 
metamorphic movements. . very much developed; its rigidity prevents 
; any kind of metamorphic movement. 
Endoplasm: distinctly. alveolar, like in Endoplasm: alveolar, structure difficult to 
the other genera of the Chilomastix group. see and only rarely observed. Siderophilous 
No siderophilous granulations. Unimportant  granulations constantly present. 
inclusions. 
Cytostome: long, with distinct chromo- Cytostome: short, always without chro- 
philous lip of nuclear origin. mophilus lip. 
Unduling membrane; short, transversing Undulating membrane: always wanting. 
the whole cystostome longitudinally; readily (This is a quite sure characteristic). 
seen in fresh specimens, invisible after 
staining. 
Form of body: slightly variable on Form of body: Invariable for the same 
account of metamorphic movements. individual, 
Nucleus: vesicular, like in other flagella- Nucleus: never vesicular, generally fo- 
tes, hardly ever with central caryosome. med of contiguous chromatic granules. 
Nuclear aspects the same as observed in the 
Chilomastix group. 
Flagella: given the connection of undula- Flagella : only four anterior ones, which 
ting membrane and blepharoplast, there do not differ from those of Tetrachilomastix, 
must exist a posterior flagellum, which may 
be difficult to see. 
I11.—Cytoiogy of Trichomonas. plasm; they are oftenhexagonal, with regu- 
lar outline and slightly rounded angles (fig. 
: 2): more rarely they are round or ovoid (fig 
to t t 
tions have been added lately to the cytclogy 3); When treated by HEIDENHAINS iron 
of the genus Trichomonas, Recent resear- matan <th fai deen bine Go 
ches by KUCEINSKI, MARTINS and RO- PRET e Po 8 
: AE less intensely than the chromatin and the 
BERTSON, on species found in birds, and id hil lati E in fla. 
of WENYON, on Trichomonas muris, have A ee AR OS eee ee En 
thrown much light on the internal structure gellates. At first 1 took them for a chromo- 
nd the process of multiplication. toid substance directly connected with the 
Even so, some of the microscopical as- metabolism of the nuclear chromatin. Their 
pects were not described and still less ex- | generally chrystalline apperance suggests 
plained by those students. I found, for ins- | that they might be due to a secretion. 
Quite a good number of new contribu- 
tance both in Trichomonas muris and T. caviae I also observed apparently real cystoid 
some particulars that had been overlooked | forms of Trichomonas (fig. 5—10); they 
or wrongly explained. may be the same as those described by 
As already. mentioned in a previous pa- BRUG as real kysts, but I could not make 
per, one or more corpuscles are found inthe + sure, being unable to consult the original 

