* 
188 5.] Some New Infusoria. 441 
further to seek it. The form now referred to differs from all 
others in the number of the frontal styles, the character and 
arrangement of the anal styles and caudal setz, and in the shape 
of the carapace, which has a very conspicuous keel or high acute 
ridge traversing the dorsum from the frontal to the posterior 
borders. In Fig. 7 is shown the ventral aspect with the ambula- 
Fig. 7. Fig. 8. 
Fic, 2 n carinata, sp. nov., ventral aspect, Fic, 8.—The same in dor- 
sal asp 
tory organs and setæ; in Fig. 8 the upper surface of the cara- 
pace with the central keel that suggested the specific name. 
Euplotes carinata, sp. nov.—Carapace irregularly Se, sey frontal and 
tight-hand borders evenly rounded, the posterior margin vex usually emar- 
ginate on the right-hand side, the left-hand border reeset ah obliai; truncate in 
Opposite directions, thus forming a subcentral rounded protruding angle ; dorsal sur- 
face traversed by a single conspicuous median and longitudinal keel or acute ridge, 
and by four to six longitudinal furrows ; seven frontal, three scattered ventral and five 
Straight simple anal styles; four aboae caudal setæ, the two on the left-hand. 
side close together but remote from the margin; peristome-field narrow , arcuate, the 
posterior third of the right-hand border ciliated; nucleus band-shaped, long, semi 
circular. Length of carapace x},, greatest width 5}; inch, Habitat: auntie 
water with dead leaves 
In the American eR Microscopical Journal for Dec., 1884, 
the writer described a Euplotes under the specific title of plumipes, 
so naming it on account of the beautifully fimbriated condition of 
the anal styles ; but the figure there published represented a few 
of the adoral cilia in an incorrect position. Through the kind- 
ness of Dr, Packard I am able to present here a corrected draw- 
ing (Fig. 9) of the same interesting infusorian with the descrip- 
tion. My pleasure in doing so is increased not oniy by the 
