stokes.] ^4:b [Sept. le, 



Trachelomonas acanthostoma, sp. nov. 



Lorica subspherical, brown, the anterior extremity bearing two more or 

 less irregular rows of short, conical spines encircling the orifice, which is 

 not produced, the remaining surface punctate ; endoplasm apparently 

 vacuolar. Length, ^ij inch. Bab. — Pond water. 



Anisonema solenota, sp. nov. Fig. 5. 



Body sub-elliptical, depressed, less than twice as long as broad, slightly 

 narrowed at the anterior extremity ; the posterior border rounded ; the 

 frontal margin slightly and narrowly truncate ; ventral surface flat, the 

 dorsal longitudinally traversed by a subcentral depression or groove ; oral 

 aperture distinct ; flagella diverse in length, the vibratile appendage about 

 as long as the body, the trailing twice tliat length ; contractile vesicle 

 double, situated opposite to each other in the anterior body-half, near the 

 median groove ; nucleus single, subspherical, subcentrally placed near the 

 left-hand body-margin ; endoplasm colorless, transparent. Length, y^J^^ 

 inch. Hal). — Standing pond water. 



Protoperidinium Umhatum, sp. nov. Fig. 6. 



Carapace rhomboidal, depressed, little longer than broad, the postero- 

 lateral margins produced in two, short, acuminate, horn-like processes, 

 the posterior border concave ; ventral surface flattened, with a central, 

 longitudinal depression ; surface facetted and minutely reticulated, the 

 margins of the carapace and of the equatorial groove having a narrow, 

 colorless, projecting, flattened and reticulate border ; flagellum of the 

 lateral groove spiral. Length, 3^0 inch. Hah. — Marsh water, with 

 sphagnum ; color, yellow. 



Holophrya ornata, sp. nov. Fig. 7. 



Body obovate, compressed, slightly curved toward one side, less than 

 three times as long as broad, the anterior extremity rounded, the posterior 

 truncate ; cuticular surface not striate, entirely ciliate ; the cilia long and 

 fine ; oral aperture eccentric, the borders slightly protruding ; lateral mar- 

 gins and posterior extremity ornamented by two rows of cuticular, 

 rounded elevations, the series beginning at the middle third of one lateral 

 border, and continued through the middle third of the opposite region, 

 the constituent elevations of one series being alternate with those of the 

 other ; contractile vesicle single, large, near the posterior extremity ; 

 nucleus obscure ; endoplasm coarsely granular. Length, about ^-^^ inch. 

 Hab. — Standing pond water. Movements rotatorj'- on the longitudinal 

 axis. 



