1885.] Some New Infusoria. 443 
wide, triangular, the upper right-hand corner prolonged in a sinistrally directed heli- 
coidal curvature, posteriorly extending beyond the center of the ventral surface, the 
cilia of the anterior and left-hand borders large and cirrose, the posterior third of 
. the right-hand margin ciliated; six frontal, three ventral and five anal styles, the 
extremities of each of the last finely fimbriated; caudal setæ four, the two on the 
right-hand side of the median line much branched; dorsal surface convex, without 
longitudinal furrows, minutely roughened and often ornamented by longitudinal 
rows of equidistant elevations formed of minute prominences arranged in stellate 
clusters; nucleus band-like, curved, very long, extending around nearly the entire 
periphery, its extremities separated by a short interval near the right-hand body 
margin; anal aperture in close proximity to the contractile vesicle. Length of cara- 
pace sj}, inch. Habitat: pond water, near the bottom. 
Conjugation is accomplished through the union of two indi- 
viduals by the left-hand half of the ventral surfaces, and multipli- 
cation is by transverse fission. The first apparent change pre- 
ceding the latter act is the development of a series of cilia almost 
parallel with the left-hand margin of the peristome, while from 
the comparatively vacant space over which the ventral styles are 
scattered, the zodid gradually extrudes fourteen new styles, a 
second contractile vesicle appears, and the infusorian then pre- 
sents the interesting aspect of a Euplotes with a double row of 
adoral cilia, two pulsating vacuoles, four caudal sete and twenty- 
eight ambulatory styles. The body quite rapidly elongates until 
about twice the ordinary length, and separates across the middle, 
distributing the twenty-eight styles so that the anterior moiety 
preserves the old frontal and ventral ones, taking five of the new 
for its anal supply and extruding four fresh caudal sete. The 
posterior portion therefore has the newly formed frontal and ven- 
tral and the old anal styles, with the old caudal sete. But before 
the final separation the posterior animalcule extrudes four addi- 
tional caudal setz, then having twice as many as the normal 
complement, gradually and in irregular sequence absorbing the 
four old and now unwelcome and useless ones, those that are 
branched being the last to appear and the last to be absorbed. 
