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A. C. Stokes—Fresh-water Infusoria. 315 
and the pedicles of some of the Choano-Flagellata, in all of 
which the change has been observed. 
The species is shown in 
Bicosceca leptostom a, Sp, nov. 
the greatest width of the lorica; animalcule ovate or subpyri- 
form, occupying the anterior half of the sheath, being entirely. 
tesentative ; resembling it also in the proportion borne by the 
width of th 
Which the extended animal protrudes itself, but differing in 
me, length of pedicle and in the form of the enclosed zooid. 
he narrow, lip-like prominence being the only portion of the 
‘Situated. Length of lorica sysz inch. Habitat.—Pond water; 
attached to Myriophyllum. Solitary. ; 
With this ssid sie peeoediess species the long flagellum, when 
8reat diameter of the coil is here horizontal, so that : aa » 
Test by its greatest width on the zooid’s frontal border. sine 
pbtained a oye! of the usually abundant B. lacustris J. Olk., 
Ut with j 
diameter te the coiled flagellum is vertical, so that the narrow 
