New Infusoria from the United States. By Dr. A. C. Stokes. 703 
of those forms that present a concavity in the part, the appearance 
varying from a conspicuous sub-central hollow to a slight depression 
or even none, as already mentioned. 
Eistrio vorax. Fig. 14. 
Body broadly ovate, often somewhat curved toward the left-hand 
side, widest posteriorly, the right-hand margin evenly convex, the left- 
hand side usually concave, yet sometimes almost straight ; posterior 
margin rounded, or in mature and old forms slightly emarginate ; 
frontal border oblique, often somewhat concave ; upper lip small, 
crescentic ; peristome extending to the centre of the ventral surface, 
the right-hand border ciliate and bearing a narrow membrane ; frontal 
styles six or seven, large, uncinate, with three smaller setae in an 
oblique series nearer the right-hand body margin ; ventral styles five, 
two near the apex of the peristome field, two near the five large, 
broad, fimbriated anal styles, one sub-centrally placed ; marginal setae 
longer and more prominently projecting beyond the posterior 
extremity, but there comparatively few and wide apart, only the first, 
second and third anal styles on the right-hand side usually projecting 
beyond the body margin ; endoplasm usually dark and semi-opaque 
by reason of the numerous, inclosed, small, dark granules. Length 
of body 1/150 in. Hab. standing pond water with decaying 
vegetation. 
Acineta sequalis. Fig. 15. 
Lorica broadly sub-triangular, much compressed, the length 
equal to the width of the anterior margin, the frontal border truncate, 
somewhat convex, apparently closed except at the slightly produced 
antero-lateral angles, but probably opening by a transverse slit for the 
escape of the embryo ; gradually diminishing toward the posterior 
extremity, the lateral borders slightly and sub-centrally constricted, 
the posterior margin truncate, slightly convex ; pedicle in length less 
than one-half the greatest width of the lorica ; tentacles capitate, in 
two antero-lateral fascicles, one or more presenting externally a 
spiral aspect ; endoplasm coarsely granular, entirely filling the cavity 
of the lorica ; contractile vesicle single, spherical, located in the 
anterior body-half, near one lateral border ; nucleus spherical, sub- 
centrally located near the lateral margin opposite the contractile 
vesicle. Length and greatest width of the lorica, 1/750 in. Hab. 
attached to the leaflets of Myriophyllum and to other aquatic 
plants. 
In form this resembles Acineta foetida Maupas, a salt-water 
species. 
