new Infusoria from American Fresh Waters. 103 



doubtfully with A. margaritifer, Ehr., union taking place 

 between the parts anterior to the oral aperture, this orifice 

 being occasionally included. 



LoxopJiyllum vorax^ sp. nov. (PL I. fig. 10.) 



Body elongate lanceolate, three times as long as broad, 

 longitudinally striate, soft, flexible, and elastic, both extre- 

 mities rounded and somewhat curved towards the ventral 

 border, the posterior widest, the body tapering thence towards 

 the frontal region ; oral aperture subterminal, enormously ex- 

 pansile ; dorsal border convex, the ventral usually flattened ; 

 nucleus single, ovate, subcentral ; contractile vesicle single, 

 spherical, situated near the ventral border of the posterior 

 extremity ; trichocysts numerous, conspicuous, arranged in a 

 parallel series perpendicular to the frontal, dorsal, and posterior 

 borders; anal aperture not observed. Length of extended 

 body x^]j inch. 



Hah. Standing water, with Sphagnum. 



In a single instance the transparent colourless body was 

 wonderfully distorted by the internal pressure of two Rotifers 

 which the Infusorian had engulphed. The body was here 

 scarcely longer than broad, and the surface was most irregu- 

 larly protruded. As digestion was accomplished the normal 

 contour was resumed, and the animal's sluggish movements 

 became more active. When swimming the movements are 

 often rotatory on the long axis. 



Colpidium putrinmn, sp. nov. (PI. I. fig. 11.) 



Body ovate, less than twice as long as broad, longitudi- 

 nally striate, the anterior extremity obtusely pointed, the 

 ventral surface slightly flattened ; vibratile membrane small j 

 contractile vesicle single, spherical, laterally located near the 

 posterior extremity; nucleus subspherical, subcentrally placed ; 

 endoplasm granular, usually crowded with small spherical 

 food-masses; anal aperture inferiorly postero-terminal. Length 

 of body jI^ to ^4-0 inch. 



Hah. A putrid vegetable infusion in creek-water. 



Reproduction is by transverse fission, a second contractile 

 vesicle generally appearing previous to the beginning of the 

 process. 



Colpidium striatum, sp. nov. (PI. 1. fig. 12.) 



Body subreniform, twice as long as broad, longitudinally 

 striate, the anterior extremity slightly curved towards the 

 ventral aspect; vibratile membrane conspicuous; contractile 



