Their Collection and Investigation. 49
further time to the study the number of known varieties has
been augmented by me to little less than fifty. As shown in
the drawings of the species herewith submitted,1 the group
abounds with forms which vie with, or even excel, in beauty
and elegance of design the Peritrichous Vorticellidae, whose
dendritic colony-stocks and flask-like loricae are moreover here
reproduced, or more correctly pretypified, in bewildering
variety.
In the third group of the Flagellata that has to be enume-
rated, differentiation has so far progressed that a distinct
oral aperture is in all instances present. To this higher
order, that may be appropriately distinguished by the title
of the Flagellata-Eustomata (or "True-mouthed Monads"),
belong especially the comparatively large Euglenae, whose
cloud-like multitudes, taken together with their brilliant
colour, frequently constitute a conspicuous and important
element in the superficial strata of our road-side ponds and
ditches. In addition to the three typical flagellate orders
already cited, there yet remain two or three numerically
small series which connect these typical orders with either
the class Ciliata, or with lower groups of the Protozoa.
In this manner the order Cilio-Flagellata, as typified by
Peridinium and its allies, directly connects the two classes of
the Flagellata and Ciliata, its representatives possessing a
conspicuous girdle of locomotive cilia in addition to a flagel-
liform appendage. The two small orders of the Rhizo-
Fiagellata and Radio-Flagellata, as instituted by myself,
contain as yet but a few obscure forms (e.g. Reptomonas,
Rhizomonas, and Actinomonas), which connect in a similar
manner the typical Flagellata with the lower groups of the
Protozoa, known as the Rhizopoda and Radiolaria.
A general outline of the limits of the Infusorial series
being included in the foregoing remarks, a few of the more
favourable conditions under which these microscopic organisms
may be successfully sought for and studied may now be indi-
cated. The most attractive and prolific hunting ground for
1 [Being duplicates of plates illustrating the treatise, 'A Manual of the
Infusoria' (Bogue), by the author, now in course of publication.—Ed.]
F