314 Notes on New Infusoria. ee ee 
in the cognate naked Amcbe of such a surface differentiation from 
the internal fluid sarcode, as may unquestionably be considered as 
distinctly cuticular. 
For this form of Diflugia, I propose the specific name of 
ligata. 
II.—The Stylonychia, Figs. 2 and 3, an aberrant form of S. pus- 
tulata, is a remarkable one; the rounded posterior end of the normal 
S. pustulata being in this example produced into a hyaline, exten- 
sile process or tail, of about one-third the entire length of the body, 
having a few stout sete scattered on its upper edge and terminating 
in a palmate expansion fringed with spines. ‘This tail is projected 
by the animal in a state of rest, but is instantaneously withdrawn 
when in motion. These extensions and retractions are attended by, 
and consequent on, changes in the outline of the body, which is 
elongated and narrowed in the one condition, shortened and broad- 
ened in the other (Fig. 3), its compression or expansion causing a 
propulsion of semi-fiuid sarcode into, or a reflux from the caudal 
appendage, and thus effecting its protrusion or contraction. 
IlI.—Of the Vorticellid (Fig. 4) I can only speak with hesitation 
and doubt. In no one of the half-dozen specimens met with, either 
through its own sensitiveness, as shown by the ready separation of 
the zooids from the stalk, or the restless movements of its host, have 
I had the opportunity of observing the expanded peristome and 
ciliary disc, though both are clearly discernible in their retracted 
condition. In that state they closely resemble those of an Epistylis, 
with which its general character suggests its association, and to that 
genus I shall venture to refer it, though presenting a wide diver- 
gence from the Epistylid type of ramification, in bearing its zooids 
at unequal heights. How far deviation from rule in this respect 
should operate in excluding it from the genus Epistylis I must 
leave, however, to more competent authority to determine. 
Its specific characters are as follows :— 
Epistylis ? (Fig. 4). Zooids, two—one terminal, the 
second borne on a short stalk springing from below the middle third 
of main stem, similar, large — 545th — elongate elliptic, faintly trans- 
verse striate, colourless. Peristome and ciliary dise unknown, when 
retracted forming a mammillary projection at the summit of the 
zooid, contractile and several large food vesicles observed, but no 
nucleus. Stalk beautifully transparent, strongly and somewhat 
closely corrugated to near the base, where it is flattened and ex- 
panded with a few longitudinal striations. 
Parasitic on Cyclops quadricornis. 
ReapinG Microscoricau Sociery, November 1. 
