NEW TYPE OF PPOTISTAN PARASPTE. 
483 
of the iucurved part of the body. The size is given as 8-9 ju 
long by 2-3 g wide. Certes proposed the name Ancyromonas 
ruminantium for the parasite, although he recognised that 
there was very considerable difference between the new 
organism and the known species of Ancyromonas. (As 
will be seen from the subsequent account, the new parasite 
has nothing whatever to do with Ancyromonas.) Certes 
goes on to say that he found also in the rumen Sarcinm, the 
predominating forms being ovoid, hyaline and small, about 
8-10 g by 2-3 g. The smallest forms showed sometimes the 
commencement of budding,, and in consequence might be 
associated with yeasts. Others, the great majority in fact, 
multiplied by fission. The ovals which we have found have 
certainly nothing to do either with yeasts or Sarcinte. It 
seems very probable, however, that they are the same thing 
as the predominating ovoids of Certes, which he erroneously 
connected with the smaller, budding organisms; these latter 
may have been of the nature of Sarcinm. The second refer- 
ence is a brief note by Kerandel, in a paper on haematozoa 
observed in the Congo Bull. Soc. Path, exot.,^ vol. ii, 1909, 
p. 208), to the effect that he had observed from the 
oesophagus of an antelope (Cephalophus sp.) bodies 
similar to those previously noted by Certes. He refers to the 
conspicuous cilia inserted in the middle of the concave side 
of the body (cf. below, p. 440). Neither author gave any 
figures of the parasites, but it is apparent that both were 
dealing with the same creature which is here described. 
Hence, the new parasite must bear the name 8 el ene- 
mas tix ruminantium (Certes). 
The rumen is undoubtedly the principal habitat of 
Seleno mast IX . A small drop of the fluid contents taken 
from any part of this bulky organ (in the case of killed goats) 
has always been full of one or other form of the parasite. The 
crescents have been found also, in sparing numbers, in the 
rumen of a sheep. Hence this creature appears to be a 
common parasite of ruminants, and, at a.iiy rate, in the goat 
is very abundant. The parasites also occur in small numbers 
VOL. 59, PAKT 3. NEW SEEIES. 28 
