Opalina. 321 
in April and May; that they decrease in the hot summer months; 
that in December and January they are entirely absent. On March 22¢ 
numerous “FVimmerwalzen” {apparently O. intestinalis|, were found in 
the rectum of the “Mittelfrosch” during the winter sleep, but they 
were not so large as in summer. The “Llimmerwalzen” (‘Text 
Fig. XIV, B) are found only in the “Mitfelfrosch”, never in the 
“Landfrosch” or “Wasserfrosch”. When magnified 370 diameters they 
appear 1 inch long and 1/,, of an inch broad. On p. 311 he gives 
the name Leucophra to these forms. Certain much larger “/’lammer- 
quadrate” |probably O. ranarwm| are mentioned and figured (Text 
Fig. XIV, A). 
S 
ape 
Dinmnii™ 
Rm 
Text Fig. XIV. 
Gorze’s figures of Opalina (?). A, three of his eight figures of “Flimmerquadrate” 
[apparently O. ranarum]; B, a group of “Flimmerwalzen (Leucophra)” [probably 
O. intestinalis or O. caudata] from the rectum of the “Mittelfrosch”. 
[O. F. Minuer’s (1786) Leucophra globulifera thought by Kuren- 
BERG (1821) to have been an Opalina, seems clearly not to have belonged 
to this genus]. 
Scurank (1803) gives a brief description (p. 68) of Paramaecium 
incubus, which he regards as perhaps the same as Buiocu’s Hirudo 
intestinalis, which was probably Opalina intestinalis or O. dimidiata. 
[His description however seems to apply to Balantidiwm entozoon and 
not to an Opalina.| 
[Bory pe Sr. Vincent’s (1824) reference to Leucophra globulifera, 
thought by Enrenrere to apply to Bursaria [Opalina] ranarum, is 
really to a different form, as O. F. Miuuer’s (1786) original description 
of Leucophra globulifera shows.| 
EHRENRERG (1831) (p. 110) describes very briefly Bursaria 
