1885.] Infusoria from Fresh Water. IQ 
depressions disappear, and the body becomes smoothly subcylin- 
drical. In life, however, it cannot be mistaken for any known 
species of the genus. Among the Euglenæ it is unique. Fig. 1 
delineates it under a magnification 
of 360 diameters, and the sub- 
joined description probably con- Fic. 1.— Euglena torta, sp.nov. X 360. 
tains its essential specific characters. 
Euglena torta, sp. nov.—Body elongated, subcylindrical and traversed by three 
longitudinal, spirally directed furrows, or three spiral, keel-like longitudinal eleva- 
tions; anterior extremity rounded and slightly bilabiate ; more or less tapering pos- 
‘teriorly and terminating in a colorless, acuminate, somewhat curved caudal prolonga- 
tion; cuticular surface smooth; endoplasm green; amylaceous bodies usually two, 
cylindrical, situated one on each -side of the spherical, centrally located nucleus; 
contractile vesicle and pigment spot conspicuous near the anterior extremity; flagel- 
lum subequal to the body in length; movement rotary on the long axis. Length of 
body z}, inch. Habitat: Among Utricularia in shallow ponds in Western New 
York. 
In movement, but in little beside, a Phacus from the same pool 
resembles Euglena torta. This rotation on the longitudinal axis 
it has in common with Ph. triqueter, Ph. longi- 
caudus, Ph. pyrumand Ph. pleuronectes, the other 
members of the genus, all of which are more or 
less abundant in still and shallow waters. It is 
represented in its lateral aspect in Fig. 2, mag- 
nified 280 diameters. It may be described as 
follows: 
Phacus anacelus, sp. nov.—Body broadly ovate or subor- 
bicular, more or less compressed, the right and left sides con- 
cave, the dorsal and ventral margins each traversed by a 
deep longitudinal furrow, the body thus appearing to possess 
four keel-like ridges; caudal prolongation colorless, acuminate Fic LA 
d curved toward the dorsal aspect of the body; eye-spot g sp. nov. X 
and contiguous contractile vacuole conspicuous; flagellum 280. 
subequal to the body in length, inserted beneath a prominent 
lip-like projection; nr green. Length of body 51, inch. Habitat : : 
Shallow ponds in Western ork. 
All of the Vorticellæ are attractive, but the most beautiful 
form I have yet met with is one that occurs in some profusion 
scattered over the rootlets of Lemna from this same rich 
little pond. At first I was disposed to identify it with Ehren- 
berg’s V. chlorostigma, but subsequent study showed that such 
identification could be justified only by that zodid’s probable 
coloration. It is considerably more campanulate in form than 
