1885.| Some New Infusoria. 435 
corpuscles within the endoplasm I do not know. C/z/omonas 
paramecium Ehr., for a long time the prevailing animalcule in the 
infusion, contains similar bodies which, under the influence of 
iodine, become intensely blue, and are therefore probably amyla- 
ceous. Those within Atractonema, under similar circumstances 
do not so change. The reproduction of the European species is 
by longitudinal fission. Multiplication of the American form has 
not been observed. Fig. 1 and the following description will 
probably be sufficient for diagnosis: 
Atractonema tortuosa, sp. nov.—Body elongate, subcylindrical, soft and flexible 
but persistent in shape, seven to ten times as long as broad, tapering and pointed pos- 
teriorly, the anterior extremity narrowed, the frontal border truncate; oral aperture 
terminal, conspicuous, followed by a tubular pharyngeal passage apparently con- 
nected by its posterior termination with the spherical contractile vesicle ; flagellum 
single, vibratile, about one-half as long as the body, issuing from the oral aperture 
and taking its origin from the wall of the pharynx at some distance from the frontal 
argin; nucleus ovate, placed behind the body-center; endoplasm colorless, trans- 
parent, enclosing numerous, oblong, dark-bordered corpuscles; movements tortuous 
and rotatory on the long axis. Length of body ;45 tos}; inch, Habitat: a vege- 
table infusion, 
In the American Journal of Science for July, 1884, the writer 
described two new species of fresh-water infusoria under the gen- 
eric title Solenotus, which was subsequently ascertained to be 
preoccupied in the Hymenoptera. Consequently, in the August 
number of the same journal, the name was changed to Notosol- 
enus, the two members of the genus then being Notosolenus 
(Solenotus) apocamptus and N. orbicularis. The chief character- 
istics, aside from the persistent shape and an oral aperture, are 
the presence of a very short and inconspicuous trailing flagellum 
on the convex or ventral surface, and a longitudinal depression 
traversing the dorsal aspect, the infusorian thus appearing to 
swim on its back, since that part is expected to be more or less 
convex. Here, however, it is the ventral surface that is rounded. 
When these animalcules were first obtained, although an anal 
aperture was observed and its location recorded, an oral orifice 
was not noted, and the systemic position of the infusoria was 
assumed to be among those forms which take food through any 
point on the surface, and near to Stein’s Colponema. Since then, 
however, numerous specimens of both species have been observed, 
and although an oral aperture has not been actually discerned, 
yet the appearance of what seems to be a short pharyngeal tract 
is so constantly present that an oral orifice probably exists, and 
