704 Transactions of (he Society. 



Bhorter from onc-tbird to one-fourth as long ; contractile vesicle near 

 the frontal border ; nucleus ovate, subcentrally placed ; endoplasm 

 inclosing numerous dark-bordered corpuscles, usually aggregated at 

 the anterior extremity, thus leaving the posterior region clear and 

 transparent. Length of body 1/428 in. Habitat: A standing 

 vegetable infusion in fresh water. 



Sterromonas ]parvnla, sp. nov. Fig. 26. 



Body elongate ovate, somewhat gibbous, about twice as long as 

 broad, the posterior extremity rounded, the anterior obliquely 

 truncate, slightly excavate ; flagella rising from near the centre of 

 the frontal margin, close together, the longer about one-half as long 

 as the body, held stiffly in advance, the distal extremity arcuately 

 curved; the shorter flagellum extremely small, about one-third, or 

 less, as long as the primary appendage ; contractile vesicles two or 

 three, near the anterior extremity, two near the frontal border (one on 

 each side), a third often developed near one lateral margin ; nucleus (?) 

 large, ovate, subcentral ; endoplasm granular posteriorly. Length of 

 body 1/2250 in. Habitat : A vegetable infusion. 



Anisonema obliqua, sp. nov. Fig. 27. 



Body ovate, about twice as long as broad, the anterior extremity 

 narrowed, obtusely pointed, the posterior obliquely truncate and 

 emarginate ; dorsal surface smooth, convex, the ventral concave ; 

 flagella diverse in length, arising near together at the anterior 

 extremity, the vibratile short, the trailing rather less than twice as 

 long as the zooid ; contractile vesicles two, one on each side of the 

 median line near the anterior extremity ; nucleus subcentral ; 

 pharyngeal passage obscure ; endoplasm usually granular posteriorly. 

 Length of body 1/1500 in. Habitat : Standing pond water. 



