1885. ] | Some New Infusoria, 439 
Attached to the sides of the vessel, to fragments of leaves or 
indeed to almost any basis of support, were many mucilaginous, 
coarsely granular zoocytia formed and inhabited by an animal- 
cule generically distinct from all previously known infusoria. 
The sheath or zoocytium is very soft and shapeless, and variable 
both in size and in number of its occupants. It appears to be 
formed primarily by a thin exudation from the creature’s body 
that would be nearly invisible were it not for the extraneous par- 
ticles, spores, bacteria and débris of all kinds that adhere to the 
surface, and especially for the zodid’s excrementitious matter which 
seems to be the principal building material and the cause of the 
coarsely granular aspect. It is not uncommon to find a small colony 
produced by the mutual union, and probably by a mutual formation 
of adjacent zoécytia, the resultant of this adhesion being a non- 
descript mass of flocculent matters from under shelter of which 
the animalcules project, and when startled by the approach of a 
larger infusorian, or from other cause, quickly glide backward to 
the posterior part of their semi-transparent dwelling. These 
zoöcytia are frequently attached to vegetable fragments or to 
masses of residual detritus so that they would be an almost in- 
distinguishable part of the granular ‘aggregation were it not for 
the presence of the living infusorian. Indeed, when deserted 
these formations cannot be separated by the eye from other floc- 
culent clusters so often in the field. Yet the creature forms 
them, apparently involuntarily, for soon after a frightened zooid 
comes to rest, rejected particles in the food-bearing current begin 
to mark the outlines of the mucilaginous excretion which soon 
increases in size by the adhesion of everything that touches it. 
The infusoria (Fig. 6) are ovate in form and entirely ciliated. 
The oral aperture is at the poste- 
rior extremity of a median de- — SEE even S 
pression occupying the anterior Be 
one-third of the ventral surface sob 
and bearing on its right-hand 
margin a row of curved, cirrose Ves E 
„cilia, From the frontal border Beet TEN 
projects a cluster of long, dis- Fig, 6.—Cyrtolophosis mucicola, gen. et 
tally curved hairs which by their sp. nov. : 
constant and rapid downward lashing, force a current into the 
adoral groove and against the row of strong non-vibratile cilia on 
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