318 A. C. Stokes—Fresh-water Infusoria. 
is not constant. At times it is near and central to the dorsum, 
at others it is almost exactly in the center of the body, and 
occasionally it is found near the middle of the ventral surface. 
The majority of individuals examined had this important organ 
situated as shown in fig. 21, where it would seem to be in its 
normal position. 
Derepyxis (dep7, neck, 7v&15, box), gen. nov. 
Animalcule single, inhabiting a pedicellate, flask-shaped 
lorica to which it is in no way attached; zooid subspherical, 
enclosing two laterally disposed color-bands ; flagella two, sub- 
equal, rising from the center of the anterior margin; contractile 
vesicles two; pharynx presumably represented by a small, 
colorless space at the base of the flagella. 
This is near Stein’s Chrysopyxis, resembling it in the form 
of the enclosed zooid, its biflagellate condition and its entire 
freedom within the protecting sheath; but differing in the 
constantly pedicellate character of the lorica, the latter, in the 
genus instituted by the German authority, being sessilely 
attached to its support. ‘lhe development of a conspicuous 
footstalk to the sheath of Derepyxis is sufficient to relegate 1ts 
possessor to a new genus. The infusorian that feet pro- 
duces a pedicle before it secretes its lorica, is a little hig 
the scale than one that develops a sessile lorica. 
Derepyxis amphora, sp. nov. 
enclosed animalcule occupying the center of the sheath, sv 
e anterior border sligbtly 
dop 
numbers 0D 
the finer filamentous fresh-water Algw. The lateral color 
the entire 
a greene 
The infu- 
