A manual of the Infusoria: including a description of all known ...

72 2 ORDER PERITRICHA.
annular constrictions across the centre ; pedicle varying in its proportions
from one-quarter to the same length as the lorica, produced usually to some
distance within the lorica, having frequently
a button-like node or boss
immediately beneath its point of juncture with the lorica, this node, however,
often produced inside the lorica, or supplemented by a second boss-like
enlargement where the pedicle joins the animalcule's body. Length 1-570".
Hab.— Salt water, on algae, &c.
This form was first met with by the author at Bognor, Sussex, in the autumn
of the year 1872, and has been since obtained in great abundance from the Menai
Straits, North Wales, and has been also remitted by Mr. John Hood from Dundee.
The pedicle in most examples examined was produced a considerable way inside
the lorica, and the single boss developed at the base of this internal prolongation.
The surface of the animalcule, as seen with a magnifying power of 200 diameters,
was also distinctly striate transversely, after the manner of Cothurnia marina which
it closely resembles. Among the several modifications of this type reported by
C. Mereschkowsky from the White Sea, the one possessing a slender, rigid footstalk
equal in height to the lorica which it supports, is figured
C. nodosa var. longipes.
Cothurnia compressa, C. & L. Pl. XL. Figs. 17
under the name of
.'vnd 18.
Lorica transparent, ovate, three times as long as broad, compressed
anteriorly, so as to leave a long, narrow, slit-like terminal aperture ;
pedicle exceedingly short, supplemented by a boss-like inflation within the
interior of the carapace, to which the animalcule is attached. Length of
lorica 1-178". H.\B.— Salt water, on seaweeds and Bryozoa.
The author met with this well-marked variety attached to seaweeds and
zoophytes gathered in the vicinity of St. Peter's Port, Guernsey, in the autumn of
the year 1871. The animalcules were in all instances a pale amber colour, the
anterior or peristome region being widely dilated, so as to give it a trumpet shape
when expanded, while the cilia were very long and powerful. Claparede and
Lachmann's figures, here reproduced, represent the species in its contracted or semicontracted
conditions only.
Cothurnia ovata, Duj.
Lorica transparent, ovate, very short, scarcely
one and a half times
as long as broad, truncate and slightly dilated at the aperture ; pedicle
short and stout. Animalcules trumpet-shaped when expanded, protrusible
to a considerable distance beyond the aperture of the lorica. Length of
lorica 1-200".
H.\B.—Fresh water, on Conferva and other aquatic plants.
This species may be distinguished from Cothurnia imberUs, with which it is most
likely to be confounded, by the much shorter and more truncate contour of the
lorica and by the capacity of the contained zooid to protrude to a longer distance
beyond the orifice of its domicile.
Cothurnia patula, From. Pl. XL. Figs. 20 and 21.
Lorica transparent, cup-shaped, very short and broad, the breadth
slightly exceeding the length, the anterior margin conspicuously everted ;
pedicle short and stout ;
animalcules trumpet-shaped when e.xpanded, pro-