292 
Transactions of the 
L Monthly Microscopical 
Jourucil, May 1, 1869. 
ment of the ciliary appendages not hitherto observed in other alhed 
species, by the name of Euj>Iotes paradoxa, 
Lorica oval, no striae on the back, locomotive styles long and 
stout ; furnished posteriorly with two ramose set£e, one on either 
side of the median line, between these and the locomotive styles 
several stout recurved uncini. Long filiform vibratile cilia pre- 
sent in the oral region. Length 1-200". Inhabiting brackish 
water. 
The next species I have to refer to, I assign, with some degree 
of hesitation, to the genus Acineta. The form is an excessively 
minute one, the body proper not exceeding 1-2000" in length, and 
hence the larger representation (Plate XIL, Fig. 7) depicts it 
magnified no less than 660 diameters linear, and is the appearance 
presented when viewed with a xV-in. objective. Under a lower 
power it closely resembled a minute Ejpistylis, and might have been 
referred to the E. hotrytis of Ehrenberg, had it not been for the 
presence of retractile tentacula, a character demonstrating its affinity 
to the Acinetm; the distal extremity of these tentacula seemed 
swollen, but not permanently so, being apparently of a purely sarcodic 
nature, and altering in configuration at the will of the animal, and 
in this respect, closely approximating the pseudopodia of a Ehizopod. 
Hence my scruples for placing it in the genus Acineta, wherein it 
is now a well-estabhshed fact that the tentacular organs, with their 
distal dilatations, are nothing less than retractile tubes terminating 
in veritable suckers, wherewith these voracious animalculse seize 
and retain their prey, and, by a mode of suction, transfer to their 
own bodies the nutrient matter contained in those of their victims. 
Should the minute form here introduced eventually prove to be 
a true Acineta, it will differ from other described species, from the 
fact alone of its being placed in clusters on a common pedicle, 
the number of individuals in each cluster varying from two to five 
or six, and, in consideration of this circumstance, I propose, pro- 
visionally, to distinguish it by the name of Acineta socialis. 
Appended are its characters as so far determined. 
Individuals, as in Ejpistylis, fixed on a long and slender pedicle ; 
provided with retractile non- vibratile tentacula, as in Acineta, but 
these organs differing from those of the last-named genus, in being 
apparently of a simple sarcode material, instead of tubular structures 
provided with suckers. Length of individuals 1-2000". Inhabiting 
brackish water. 
In addition to the species just described, this rich hunting- 
ground, "the Victoria Docks," furnishes the microscopist with a 
variety of forms hardly to be met with in any other locality, and, 
in fact, may be described as a kind of neutral territory frequented 
by representatives of both marine and fresh-water genera. As- 
cending above the Infusoria, we find there one species, at least, of 
