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action. When, however, adherence is accomplished through 
the medium only of the terminations of the flagella, the body 
gyrates rapidly, and with rhythmical cadence, from right to left 
and left to right, such action causing, as shown in PI. VII. 
fig. 18, the adherent flagella to become twisted on each other, 
while the four anterior ones describe elegant undulations 
round the animalcule’s body. It would seem highly probable 
that the form described by Prof. Leidy under the title of 
Trichonympha agilis , found within the intestine of the American 
White Ant, Termes flavicam , and likened by the discoverer to 
the performers in an American ballet, whose chief attire 
consisted of long cords suspended from their shoulders, 
whirled in mazy undulations around them as they danced, 
represented a species of Hexamita observed under the conditions 
just described. Phenomena precisely identical with those just 
recorded of Hexamita intestinalis have been found by the writer 
to obtain also in the non-parasitic and marsh- dwelling species, 
H. inflata. 
One more Polymastigous Flagellate form has to be included 
in the list of endoparasitic species. This type, described by 
Prof. Stein under the name of Lophomonas blattarum (PI. VII. 
figs. 14 and 15), is found within the intestine of the common 
cockroach ( Blatta orientalis ), and is distinguished for its pos- 
session of a plume-like tuft of long vibratile flagella, which are 
produced from the anterior extremity of its otherwise naked 
and sub-ovate monadiform body. The chief interest attaching 
to this infusorium is connected with the fact, that among all 
other Flagellata (as so far known), it presents the nearest 
approach to the remarkable pelagic type upon which Prof. 
Hackel has recently conferred the name of Magosphcera planula, 
and which in its most characteristic adult state consists of 
free-swimming spheroidal colony-stocks of animalcules, whose 
anterior borders are densely clothed with long flagella, much after 
the manner of Lophomonas , but whose aggregate mode of develop- 
ment is comparable to that of Syncrypta or Uroglena. A second 
species, or well-marked variety of Lophomonas , having a more 
elongate and spirally striate body, has been recently described 
by 0. Biitschli under the name of L. striata. 
No animalcule referable to the Eustomatous section of 
the Flagellata can as yet be included among the strictly 
parasitic species, the only type remaining to be noticed 
before arriving at the Ciliate division of the present organic 
series being the species somewhat imperfectly described by 
Dr. J. H. Salisbury under the name of Asthmatos ciliaris , delineated 
in PI. VII. fig. 16. This infusorial form, possessing locomotive 
appendages of two orders, consisting of an anterior tuft of 
vibratile cilia, from the centre of which is produced a single 
