142 
J. O. SIDDALL. 
figured in their ^ Etudes sur les Infusoires et les Rhizopodes.’^ 
The original figure (reproduced by Dr. Carpenter in his 
'Introduction to the Study of Foraminifera/ PI. II) is a 
lateral view only. I am now able to give some details in 
respect to the mouth, as well as concerning other points in 
its structure, from specimens obtained from the Welsh 
coast. 
It is singular that so remarkable an organism does not 
appear to have been observed, except by its original dis- 
coverers, until found by me in 1878. My specimens were 
obtained from the sides of a bottle of sea-water, in which 
I was keeping some Hydrozoa and Polyzoa collected 
on the shore, at low water-mark, near the Little Orme’s 
Head, Colwyn Bay. It may be also of some interest 
to observe that the same gathering furnished fine specimens 
of Haliphysema Tumanowiczii. Its non-appearance for so 
long an interval may be accounted for by the fact that in 
English books it is invariably stated to have been originally 
found in " unknown fresh water from Berlin but having 
found it in 1878 in sea-water from Colwyn, and subsequently 
in sea-water from Tenby, either the Berlin habitat must be 
erroneous, or the creature lives indilferently in marine and 
fresh water, the former being the likeliest hypothesis. If 
vessels containing marine Algae and other organisms, which 
have remained undisturbed for a few weeks in the autumn 
of each year, were carefully examined, both Lieherkuhnia 
and Shepheardella would probably be found to be not un- 
common British species. 
In general contour Lieherkuhnia is ovate or rounded, but 
the outline is constantly slowly changing by the movement 
of the enclosed sarcode. The actual change in shape is not 
very great, and consists principally in the gradual dilation of 
one part or other of its circumference, causing it to vary 
from an elongated oval or pyriform to a subglobular form. 
The milky- white, semitransparent, coarsely granular proto- 
plasm, of which the body consists, is invested by a thin pel- 
lucid membranous integument, the interior surface of which is 
lined by a transparent " subcutaneous layer ” of finely granu- 
lated protoplasm. Its exterior surface is set with a number of 
highly refractive, short, rod-like spicules, disposed at various 
angles upon it, like those described by Greeff in Heliophrys 
variahilis. These spicules are indistinguishable in the living or- 
ganism, being covered by the coat of motile protoplasm, but are 
brought into view when this is absent, as in dead specimens. 
The investment is sufficiently flexible to follow closely all 
* Geneva, 1850—1861. 
