HAZEN: NEW SPECIES OF LOBOMONAS 129 
lobe is a dense, gelatinous structure, or simply membranous and 
separated by a space from the protoplast. In certain cases the 
latter interpretation is clearly indicated, for the tip of the lobe 
is manifestly of thickened grayish wall substance, with a clear 
space inside (FIG. 37). The cilia are attached at a single point 
to the anterior end of the protoplast, which is usually obtuse, 
though it may have a slight beak; they immediately diverge 
at a wide angle to pass separately through the papilla of the wall, 
and are often seen in quiescent individuals stretching out stiffly 
in the form of av; their length is as variable as the cell outline, 
often being less than the cell length, but perhaps more character- 
istically distinctly greater than the cell length. At the base of 
the cilia are the alternately pulsating vacuoles, lying regularly 
in such a position that a line passing through the two is perpen- 
dicular to the plane in which the quiescent cilia lie, so that only 
one of the vacuoles is seen when both cilia are equally clear, but 
both may appear at the same level hci one of ne cilia i < bebind 
the other (FIG. 29). 
in the deeply hollowed out chromatophore (Fr IGS. 24, 26), contrast- 
ing sharply with the axial pyrenoid in a massive chromatophore 
described and figured by Dangeard (3) in Lobomonas Francei. 
The small rod-shaped red eye-spot lies in front of the middle 
of the cell, but apparently not in a constant position with ref- 
erence to planes passing through the cilia and contractile vacu- 
oles, as is the rule in Pteromonas and in many species of Chlamy- 
domonas. 
REPRODUCTION. The earliest stages of division found pre- 
sented the appearance of a cleavage transverse to the longi- 
tudinal axis of the cell. More careful consideration, however, 
here, as in L. pentagonia, indicates that an early rotation of the 
protoplast has eluded observation, for in Fic. 36 two contractile 
vacuoles, lying in what appears to be the original colorless an- 
terior cytoplasm, now appear on the side of the cell. Even in 
such a case as that shown in Fic. 37, there is a colorless central 
region which can only be explained on the supposition that the 
anterior end of the protoplast had revolved ninety degrees from 
its original position, here not clockwise as in Fic. 36, but in a 
vertical plane with reference to the observer. The mother cell 
retains very much of its original form throughout the process of 
division, instead of rounding up, which Dangeard describes as 
being the general rule for L. Francei. Here also there may be 
four or eight daughter cells formed, and they regularly show the 
