434 
Eimeria n. sp. in Man 
spores whose walls (sporocysts) were quite intact. The pink-stained sporo¬ 
zoites within them appeared very degenerate, but were still recognizable. 1 
made a number of careful measurements of the oocysts and spores as they 
appealed in water. I then attempted to restain the preparation—with little 
success—and have remounted it permanently in euparal. In this medium, 
which has a lower refractive index than balsam, the cyst walls are barelv 
visible. 
I have had little difficulty in confirming Dr Snijders’ statement that the 
cysts are those of a species of Eimeria. Every oocyst contains the typical 
foui spores, each of which—in all specimens sufficiently well preserved for 
study encloses two sporozoites. Dr Snijders states that the diameter of the 
oocysts is 40-48 g. Most of those which I have seen are now too shrivelled 
for it to be possible to measure them accurately; but the few measurements 
which I have been able to make, and my estimates of the probable dimen¬ 
sions of the collapsed cysts, agree with his observations. 
As regards the spores which, as already noted, were still intact in many 
instances—I would note the following points. Dr Snijders states that they 
are whetstone-shaped, and measure 17-20 g in length, with a breadth of 
7 8/x. They aie shown best, I think, in his Fig. B: the more irregular outlines 
of Figs. C and D being due, apparently, to the fact that the spores in these 
were not all lying flat, but were seen more or less obliquely inclined to the 
axis of the microscope. It seems to me probable that Dr Snijders has not 
made sufficient allowance for this obliquity of many of the spores in making 
his measurements. At all events all my own measurements—made with great 
care from spores lying at right angles to the optical axis of the microscope, 
oi estimated from those lying inclined to it at various angles—show that the 
length of the spores is slightly greater than he states. All my measurements 
lie between 20 g and 25^, most of the spores measuring 22-24^. I fixd the 
width at the middle is—as stated by Dr Snijders—approximately, 7-8^. 
(This dimension is not, of course, subject to the same error in its determ jation 
as the length.) All the spores appear to be fusiform, with their two ends 
equally pointed. Traces of an epispore (“mucous outer layer” of Dr Snuders) 
are visible on some; and the remains of sporocystic and oocystic residual 
bodies can be made out in the majority of the cysts. It was impossible, 
hov ever, to make out any details in the sporozoites. 
It seems to me probable that the unsegmented oocysts referred :o by 
Di Snijders, and shown in his Fig. A, are abnormal specimens. The proto¬ 
plasmic inclusion appears far too small for a normal form in an early stage of 
development, but such abnormal stages are often seen in other species, and 
represent, I belies e, dead oocysts which have failed to get fertilized. 
The oocysts of this species are of unusually large size, and are certainly 
the hugest described from man; but they are not the largest known in the 
Coccidia. Those of Aggregata, for example, attain much greater dimensions. 
Although I v as struck, at first, by the resemblance of these oocvsts to 
