Infusoria from the United States. By Dr. A. G. Stokes. 299 
Cothurnia inflata sp. n. PI. V. fig. 2. 
Lorica urceolate, not gibbous, twice as long as broad, widest and 
inflated posteriorly, the posterior border rounded ; the lateral margins 
often undulate ; the anterior, neck-like prolongation cylindrical, some- 
what curved toward one side, the frontal border truncate, the aperture 
oblique ; pedicle short ; enclosed animalcule elongate, finely striate 
transversely, and attached posteriorly through the intermedium of a 
short, longitudinally striate, internal secondary pedicle ; ciliary disc 
obliquely elevated; peristome with a collar-like membrane, highest 
and most conspicuous on the oral side; contractile vesicle single, 
spherical, situated in the anterior body-half in close proximity to the 
pharyngeal passage, and often forced out of shape by the pressure of 
the increasing food-mass ; nucleus apparently long, narrow, band-like, 
extending near one lateral border and through nearly the entire 
length of the bed; . Length of lorica 1/430 in. Hab. — Brackish 
water near Longport, Long Island, N.Y. Collected by Mr. B. 0. 
Bogert. 
This form somewhat resembles C. curva Stein, varying from that 
species, however, in the much shorter pedicle of both lorica and 
animalcule, in the more anterior position of the contractile vesicle, in 
the much greater proportionate length to which the extended body is 
protruded beyond the aperture of the lorica, in the transverse cuticular 
striations, in the elongated nucleus, and especially in the evenly 
rounded, non-gibbous form of the lorica. 
Cothurniopsis ( Cothurnia ; form) g. n. 
Lorica erect, posteriorly pedicellate, the anterior lateral border a 
movable valve-like continuation of the lorica wall and closing the 
anterior aperture when the enclosed infusorian is contracted ; ani- 
malcule otherwise as in Cothurnia. 
Cothurniopsis valvata sp. n. PI. Y. figs. 3, 4. 
Lorica corneous, elongate-ovate or broadly urceolate, about twice 
as long as broad, widest and inflated posteriorly, but differing in 
appearance according as the frontal or the lateral aspect is observed ; 
in lateral view elongate-ovate, the posterior border rounded, the 
anterior region narrowed, compressed and neck-like, the frontal border 
obliquely truncate, this portion forming the valve-like appendage 
closing the anterior aperture when the animalcule is retracted; in 
frontal aspect broadly urceolate, the posterior border rounded, cen- 
trally thickened into a short, boss-like truncate projection, through 
which passes a longitudinally striate continuation of the pedicle ; 
anterior region forming a broad, neck-like portion, the frontal border 
convex, the valve-like appendage being invisible in this position ; 
pedicle conspicuously developed ; enclosed animalcule projecting, when 
extended, for about one-third of its entire length beyond the lorica ; 
cuticular surface transversely striated ; an anterior collar-like mem- 
