190 C. CLIFFORD DOBELL. 
huge sling (fig. 6). Its gradual development from the simple 
network in a young ‘“‘ bud” can easily be traced (figs. 4, 5, 2, 
6). The sling is seen to be composed of a number of parallel 
fibrils of plastin with chromatin granules imbedded in them 
(fig. 6). 
In the process of segmentation (“budding’’) the nuclear 
net remains unaltered—from beginning to end of the process. 
This is well seen in fig. 1, where every stage in segmentation 
can be seen. Large segments are at first constricted off, and 
these subsequently divide in two. 
I have never found individuals with the perfect “ bladder ” 
nuclei described by Gonder. Perhaps they are really the 
nuclei of the renal epithelium cells, either lying on the organ- 
ism or after being ingested. The great size variation repre- 
sented in Gonder’s figure (PI. 11, fig. 58) is worthy of note. 
I am inclined to think—after examining a large number of 
individuals—that they are not of normal occurrence during 
the vegetative life of the organism. But it is impossible to 
judge on negative evidence alone. 
Chromidina coronata, Foett. emend. Gonder. 
This infusorian differs from the preceding in the single 
character already observed by Feettinger and Gonder—the 
possession of a ring of long cilia surrounding the head, 
crownwise (fig. 8). The nuclear apparatus is exactly lke 
that of C. elegans in every particular. The remarkable 
sling in the network in the head is just the same, andis found 
strongly developed in large individuals only (fig. 8). 
Reproduction takes place in a manner exactly like that 
seen in U. elegans. 
Opalinopsis sepiolex, Feett. 
O. sepiole differs considerably from the two infusorian 
parasites already considered. It has been described in some 
detail already, but the following points may be added to these 
descriptions (6, 7). 
