130 
J, D, SIDDALL, 
On Shepheardella, an Undescribed Type of Marine 
Rhizopoda; with a Few Observations on Lieberkuhnia. 
By J. D. SiDDALL. With Plates XV and XVI. 
A FRESH interest has attached to the Rhizopoda of recent 
years, as extended research has furnished data for the more 
systematic study of the group. But the labours of Hertwig, 
Cienkowski, Archer, F. E. Schulze, and other eminent histo- 
logists, so admirably summarised by Professor Allman in his 
two Presidential addresses to the Linnean Society, seem 
rather to suggest how much there must be still to learn re- 
specting the life-history of sarcode organisms, than to render 
us satisfied with what is already known concerning them. 
Under these circumstances it has appeared to me that the 
following notes on certain little understood forms, especially 
on one that does not appear to have fallen under the notice 
of previous observers, may be worth placing on record. 
On the 22nd of August, 1879, I received from my friend 
Mr. Shepheard two bottles of sea-water containing Polyzoa, 
Hydrozoa, and Sponges, which had been collected at low tide 
on the previous day from the shore netir the Lydstep Caverns, 
Tenby. For their better examination I placed a numl^m* of 
the specimens in cells, and had the pleasure of finding that 
most of them were Kving, notwithstanding their long railway 
journey in small bottles. On the following day my atten- 
tion was arrested by an organism, apparently a Rhizopod, 
which had separated itself from the other things in the cell, 
and was adhering to the glass, and which, but for the pseudo- 
podia extended from its two extremities, would probably 
have been passed over as a worm. With a view to the closer 
study of this creature, a further supply of material from the 
same locality was subsequently obtained for me by Mr. 
F. Walker, of Tenby, who, during the months of September 
and October, made various gatherings, from each of which I 
obtained specimens not only of the species originally found, 
but also of one or two other Rhizopods having features of 
interest. 
To Mr. Shepheard and Mr. Walker, therefore, I am pri- 
marily indebted for the material from which'the present paper 
was written; and, as the organism I purpose in the first place 
to describe appears to be new, I have much pleasure in 
associating it with the name of my friend and fellow-worker 
Mr. Shepheard, 
