New Infusoria from the United States. By Dr. A. C. StoJces. 701 
right-hand side ; ventral cilia in six longitudinal series ; frontal styles 
numerous, the most anterior the largest ; marginal series not project- 
ing beyond the lateral borders; anal styles five or six, fine, not 
projecting beyond the posterior margin, arranged in an obliquely 
directed series ; endoplasm brown, semi-transparent. Length 1/100 
in. Hab. standing pond water. 
Trichototaxis * g. n. 
Animal free-swimming, hypotrichous, soft and flexible, depressed ; 
frontal styles numerous, in two curved, sub-parallel series ; ventral 
styles forming three longitudinal rows ; marginal setae uninterrupted ; 
anal styles well developed ; inhabiting fresh- water infusions. 
Trichototaxis stagnatilis. Fig. 9. 
Body obovate or sub-elliptical, three times as long as broad ; 
anterior extremity obliquely rounded, the posterior also rounded and 
often centrally emarginate ; right-hand lateral border more or less 
convex, the left-hand margin flattened ; frontal border exhibiting a 
somewhat conspicuous semicircular, ridge-like elevation, continuous 
with the inner or right-hand margin of the peristomial field, the latter 
ovate, obliquely placed at some distance from the frontal border, and 
extending to near the centre of the ventral surface, the posterior apex 
continued toward the right-hand side as a short, infundibuliform 
prolongation, the adoral cilia fringing the left-hand margin being 
directed toward the right-hand side and vibrating across the peristome 
field, the right-hand border bearing an undulating membrane ; frontal 
styles numerous, in two curved series, continued posteriorly in two 
subcentral longitudinal rows of ventral styles, the third series of 
ventral setae placed nearer the left-hand body margin : marginal setae 
projecting at the posterior border only, where they are largest and 
most conspicuous ; anal styles six or more, delicate and inconspicuous, 
not projecting beyond the posterior margin but arranged in an 
oblique row ; contractile vesicle single, sub-spherical, in the anterior 
body-half, near the left-hand body margin and apparently discharging 
its contents through the dorsal surface ; nucleus multiple, scattered or 
moniliform, the nodules sub-spherical, or broadly ovate ; endoplasm 
finely granular, brownish; animalcule’s movements seldom rapid. 
Length of body 1/150 in. Hab. an infusion containing decaying 
Sphagnum. 
Oxytricha setigera. Fig. 10. 
Body sub-elliptical, from three and one-half to four times as loug 
as broad, soft, flexible, and contractile, the frontal border rounded, the 
T pixwros, hairy ; ra£is, rows. 
