442 Some New Infusoria. [May, 
opportunity to correct my own oversight, but because I can again 
ask attention to one of the most beautiful American members of 
the genus. 
The carapace of Æ. carinata is somewhat irregularly marked 
by small circles formed of minute dots visible through the trans- 
parent borders. This ornamentation is variable, however, as is 
probably the case in all the decorated species, the dots becoming 
scattered, leaving the little circles incomplete or even entirely de- 
stroying them. This variableness in the surface adornment is 
also apparent in £. plumipes, but there, when most completely 
developed, the ornamentation consists of oblong elevations ar- 
ranged in stellate clusters which are sprinkled quite regularly in 
Fig. 9. Fig. 10. 
Fic. 9.—Luplotes plumipes Stokes. FIG. 10.—Ornamentation of the carapace. 
longitudinal lines over a surface already roughened by minute 
dots. The result is very pleasing to the eye, and adds another 
item of interest to the infusorian which seems to be one of the 
bravest and most self-reliant of its class, walking or swimming 
boldly and steadily forward as if with some object of vital import 
in view. This ornamentation is shown in detail in Fig. 10. 
Euplotes plumipes Stokes.—Carapace irregularly suborbicular or elliptical, the an- 
_ terior margin trunca! te, often minutely crenulate or beaded, the upper lip crescentic 
oe Dai bade: commonly obliquely truncate in opposite directions and forming cen- 
` trally a projecting and rounded angle or keel-like protuberance ; peristome field 
