Stokes.] ^" [June 19, 



Hypotrichous animalcule, where the pulsating channel is interrupted by 

 two spherical vacuoles. 



The proper position of the following Infusorian in a scheme of classifi- 

 cation would probably be before the next one to be noticed, both then 

 immediately preceding Uroleptus. From both the genera the anal styles 

 are absent, and in Eschaneustyla the ventral setae, which are of vital im- 

 portance in generic diagnosis, exhibit an arrangement not previously 

 observed in the family group. In form it most nearly approaches Urostyla, 

 for which it might readily be mistaken under insufficient amplification. 



Eschaneustyla (s^arta, the furthest part; avsu } without; arukoq, a 

 style), gen. nov. Animalcules free-swimming, elliptical or ovate, not 

 encuirassed ; frontal styles numerous, more or less uncinate ; ventral setae 

 in three unequal longitudinal lines ; anal styles none ; marginal setae unin- 

 terrupted ; contractile vesicle canal-like, near the left-hand border. Inhab- 

 iting fresh water. 



Eschaneustyla brachytona, sp. nov. (Fig. 11). Body elongate-ovate, soft, 

 flexible and somewhat extensile, three and one-half to four times as long 

 as broad, both extremities usually rounded, the anterior the narrower, 

 somewhat curved toward the left-hand side, a slight constriction beneath 

 the frontal border ; peristome-field arcuate, narrow, oblique, confined to 

 the anterior third of the ventral surface, the posterior termination widest, 

 deepest and curved toward the right-hand side, the right-hand border 

 finely ciliate ; frontal styles about twenty-five, in oblique lines, two or 

 three supplementary styles forming the first row ; ventral setae in three 

 unequal series, the right-hand row shortest, the central line longest but not 

 extending to the posterior extremity ; no anal styles ; marginal setae unin- 

 terrupted, longest and projecting at the posterior border only ; contractile 

 vesicle canal-like, extending along the entire left-hand body-margin, inter- 

 rupted anteriorly by two spherical or sub fusiform dilatations, one near the 

 posterior termination of the peristome-field, the other near the center of 

 the lateral body margin ; nucleus not observed ; anal aperture postero- 

 terminal. Length of body, 1-112 to 1-150 inch. Habitat. — Standing 

 water, with dead leaves. 



The last form to be here mentioned is one apparently bridging the space 

 between Holosticha and Uroleptus. In general appearance, in the arrange- 

 ment of the ventral appendages and the conspicuously flattened marginal 

 setae it recalls the latter. The caudal appendage is not constant, therein 

 differing from and separating the Infusorian from the invariably caudate 

 Uroleptus. In this soft and variable posterior extremity it has a peculi- 

 arity not possessed by the remainder of the body, and not possessed by 

 any member of the highly organized group to which the creature belongs. 

 This posterior extremity is changeable in form. When first observed 

 the part may be conspicuously bifid, soon to give place to an obtusely 

 pointed, a truncate or an evenly rounded tip, or, as seen in a single 

 instance and illustrated in figure 13, one point of the bifurcation may be 

 extended in a way to suggest a pseudopodium, with a bulbous termina- 



