THE INTESTINAL PROTOZOA OF FROGS AND TOADS. 265 
frogs kept in the laboratory. ‘The juices seem to become 
inactive after the frogs have been kept in captivity without 
receiving their usual food, 
Metzner (67) has already pointed out that the spores of 
Himeria stiede are opened by pancreatic and not gastric 
juice—a condition which probably obtains also in E. rane. 
In conclusion, I may call attention to the similarity which 
exists between the sporogonic stages of this coccidium and 
those of Himeria salamandre, Steinh. (see Simond’s 
figures, etc.). The schizogony and fertilisation of this animal 
are now known, through the work of Steinhaus, Simond and 
others (cf. 83, 82, 81, 14). 
D. CILIATA, 
I am able to add but little to the life-history of the Infu- 
soria which occur in the frog. The two following observa- 
tions, however, appear to me worth recording. 
(1) Encystment of Nyctotherus cordiformis EKhrbg. 
As far as I know the cysts of this animal have not been 
described hitherto: which is not surprising, as they are 
exceedingly rare. When removed from the frog Nycto- 
therus nearly always dies, 
The cyst is shown in Pl. 3, fig. 51, It is a more or less 
oval structure, between 80 » and 90 w in length (that figured 
measured 87 w). Its colour is greenish-yellow, and it shows 
a very distinct striation, the striz following the lines in 
which the cilia were disposed in the free animal. The mouth 
and gullet can be seen, though somewhat indistinctly. The 
meganucleus is very distinct, but I have never been able to 
distinguish a micronucleus with certainty. One or more 
vacuoles may be present. They continue to pulsate for some 
time after the cyst has been formed. 
[have kept the cysts in water for over a week, but they 
finally died. They do not seem able to withstand drying. 
