a EN NE 
1885.] Infusoria from Fresh Water. 2I 
The pencil can give hardly more of this exquisite creature’s 
appearance than a diagrammatic outline, and little more has been 
attempted in the figures (Figs. 3 and 4). The translucent green 
coloration of the entire sarcode, the peculiar indentation of the 
side, the delicate poise of the contracted body at the summit of 
the closely coiled foot-stalk, the whole charm of the living crea- 
ture is lost in the lines of black and white. 
Vorticella smaragdina, sp. nov.—Extended body, conical-campanulate, changeable 
in shape, an irregular depression often formed on one lateral border; the width of 
the peristome nearly equal to the length of the body, the anterior margin dilated, 
somewhat constricted beneath the peristome border, the posterior body-half tapering 
to the pedicel; cuticular surface finely striate transversely and often roughened b 
minute, scattered granulations; peristome border everted, slightly revolute; ciliary 
disk very slightly elevated; the entire parenchyma translucent and colored emerald- 
green; vestibular bristle conspicuous; pedicel colorless, eight to ten times as long 
as the body, contracting in numerous close coils; contracted body subspherical, a 
posterior annulation sheathing the extremity of the pedicel. Length of body zi, 
to s}5 inch. Habitat: Rootlets of Lemna in ponds in Western New York. Soli- 
tary or few together. 
In external contour as well as in the length of the pedicel 
another species of the genus, which I have named Vorticella ma- 
crocaulis, resembles V. longifilum S.K. It is, however, imme- 
diately distinguished by its surface striations which, although 
fine, are distinct, and by the proportion borne by the length of 
the body to the width, the former, with V. ongifilum, being twice 
the latter, while in the species under consideration these parts 
differ much less in relative size. No recorded member of the 
genus possesses a pedicel of so great a length as the one here 
referred to, except V. longifilum and V. telescopica, both of the 
latter having an unornamented cuticular surface. If this contrac- 
tile foot-stalk were delineated under an amplification equal to that 
of the body in Fig. 5, it would necessarily be depicted from six 
to seven inches long, being ten to twelve times the length of the 
extended zooid. 
Vorticella macrocaulis, sp. nov.—Body elongate-campanulate, one and one-fourth 
times as long as wide, attenuate and tapering posteriorly; peristome somewhat 
wider than the greatest width of the body, everted and thickened but not revolute; 
ciliary disk evenly rounded and elevated; cuticular surface finely striated trans- 
versely ; contracted body obovate; pedicel ten to twelve times as long as the ex- 
tended body, its entire length contracting into close coils. Length of body 45 
inch, Habitat : Shallow ponds in Western New York, attached to Lemna rootlets, 
Solitary, 
Still another species of Vorticella from the same habitat is that 
\ j 
