MEMOIRS. 
On CHLAMYDOMYXA LABYRINTHULOIDES, nov. gen. et 
sp.,@ New FResHWATER Sarcopic OrGanismM. By Wo. 
ArcHErR, M.R.I.A. (With Plates VI and VII.) 
Some short time after the appearance of Cienkowski’s 
memoir on a new type of Sarcodic organisms met with by him 
in the sea (at Odessa), which he named Labyrinthulee, I 
was not a little surprised and interested on meeting with a 
form from the freshwater so wonderfully resembling those 
described by him, as, notwithstanding one circumstance, 
hereafter to be adverted to, even still to render it a matter of 
considerable question whether it may not truly belong to that 
group, even though it should not be congeneric with the 
typical Labyrinthula (Cienkowski).+ 
I regret indeed that, after repeated efforts to learn more of 
its development or history, I have but little succeeded, except 
so far as knowing that it is an endo-parasitic growth, at least 
for a portion of its existence. 
It will, perhaps, be the best course to endeavour first to give 
an idea of this curious production as it exists, before referring 
to Cienkowski’s forms, which would, indeed, be necessary pre- 
vious to comparing or contrasting it therewith, or with any 
other simple organisms evincing any similarity in minute 
specialities. 
The component elements of the present form, broadly taken, 
are primarily divisible into two—the inner soft sarcodic body- 
substance, or the contents, and the outer rigid cyst, or enve- 
lope, which nearly constantly surrounds the former. 
But neither of these are quite simple, especially the former, 
which presents a variety of constituents. 
To advert briefly in the first place to the latter, or the 
outer coat or envelope, its complexity consists, indeed, only in 
the number of similar layers of which it is composed and its 
great irregularity of outline. It is often very thick, according 
' Cienkowski: “ Ueber den Bau und die Entwickelung der Labyrinthu- 
leen,” in Schultze’s ‘ Archiv fiir mikr, Anatomie,’ Bd. iii, p. 274. 
VOL, XV.——NEW SER. ors 
