Infusoria from the United States. By Dr. A. C. Stolces. 301 
the region immediately posterior to the frontal border somewhat 
dilated; ctiticular surface ornamented by minute, hemispherical, bead- 
like elevations arranged in longitudinal parallel series; contractile 
vesicle single, spherical, in close proximity to the posterior extremity, 
occasionally produced by the coalescing of several small spherical 
vacuoles ; nucleus apparently subcent rally located, large, subspherical ; 
oral aperture exceedingly expansile ; frontal cilia each of two distinct 
parts, a thickened basal portion and a longer, finer, filamentous 
flagellum. Length of body from 1/120 to 1/160 in. The body is 
occasionally extended until the lateral borders are almost parallel and 
the infusorian elongated and band-like in appearance. Hab. — 
Brackish water from near Northport, Long Island, N.Y. Collected 
by Mr. B. 0. Bogert. 
Lembus striatus Fabre-Domergue. 
It is exceedingly interesting to find this infusorian, as I have found 
it, amongst the algae decaying in the brackish waters from about 
Coney Island, N.Y. Dr. Fabre-Domergue not long ago discovered 
it in the Atlantic near the Laboratory of Marine Zoology at Con- 
carneau, Beproduction, as I have observed, is by transverse fission. 
Litosolenus smooth ,* a-coXrjv, a channel ) g. n. 
Animalcules free-swimming, hypotrichous, soft, flexible, and 
elastic; body elongate-ovate, depressed, the ventral surface flat, en- 
tirely and finely ciliated ; the dorsal region elevated, smooth, and 
convex ; the entire body-margin elevated so that the anterior, the 
posterior, and the lateral regions of the ventral aspect are convex, 
and the corresponding portions of the dorsal surface conspicuously 
hollowed, the elevated sub-central dorsum being thus surrounded by 
a shallow, smooth, trench-like groove extending about the entire 
peripheral portion of the body ; anterior region not prolonged into a 
neck-like continuation, as in Litonotus ; trichocysts numerous. 
Litosolenus armatus sp. n. PI. V. fig. 8. 
Body elongate-ovate, about twice as long as broad, widest near the 
posterior extremity, thence tapering gradually to the obtusely pointed, 
otten somewhat oblique anterior border ; subcircular in outline, and 
dorsally rounded when completely contracted ; left-hand lateral border 
convex ; the right-band margin somewhat flattened, occasionally 
slightly concave ; posterior border convex ; upper surface of the 
elevated dorsal region gradually sloping from near its central portion 
toward the anterior extremity, where it becomes merged into the 
general aspect of the body ; the entire dorsal surface finely and longi- 
tudinally striate ; the encircling groove-like region marked by striae 
parallel with the body-margins ; cilia of the ventral region fine and 
short; the entire circumferential border of the infusorian armed by 
numerous, equidistant, colourless, curved and acuminate hook-like 
processes, varying in number and in size in different individual 
