446 Dr. A. C. Stokes on some 



StylonycMa notopkora, sp. no v. (PI. XV. fig. 1.) 



Body elliptical, more than twice as long as broad, the 

 extremities subequal in breadth, the posterior one usually 

 rounded and sometimes slightly emarginate on the right-hand 

 side, the frontal border obtuse, the left-hand margin obliquely 

 truncate, the right-hand corner obliquely emarginate, the 

 upper lip prominent, crescentic ; the inferior surface bearing 

 eight frontal styles, the posterior three being smallest, and 

 five ventral, with five anal, of the latter the three on the right- 

 hand side projecting beyond the posterior border ; marginal 

 seta? conspicuous, interrupted at the posterior extremity, 

 longest and most numerous on the right-hand margin ; caudal 

 setge long, widely separated and inserted on the dorsal surface 

 of the posterior extremity ; peristome-field arcuate, extending 

 to the centre of the ventral surface, its apical extremity ter- 

 minating in a tubular ciliated pharyngeal passage sharply 

 curved towards the right-hand side, the outer or left-hand 

 border bearing the large adoral cilia, the right-hand margin 

 finely ciliate and supporting a conspicuous undulating mem- 

 brane ; nucleus ovate, double ; contractile vesicle single, 

 spherical, on the left-hand side of the peristome, near its pos- 

 terior extremity ; anal aperture on the left-hand side of the 

 dorsal surface, somewhat in advance of the position of the 

 anal styles, the dorsum also bearing four longitudinal rows of 

 immotile hispid setas ; all the styles as well as the marginal 

 setse occasionally fimbriated. Length of body yuu inch. 



Hah. Standing water with dead leaves, or with various 

 aquatic plants. 



This differs from StylonycMa mytthis, Ehr., which, of all 

 the species, it most resembles, in that the extremities are sub- 

 equal in width, in the rounded posterior margin, beyond which 

 project three instead of two anal styles, in the possession of 

 the motionless bristle-like hairs on the dorsal surface, and 

 especially in having the opening of the anal orifice on the 

 superior or dorsal aspect. This, so far as I am aware, is 

 only the second infusorian hitherto observed with the cyto- 

 pyge, or anal opening, debouching on the dorsum, the first to 

 be noted being Loxodes vorax, Stokes*, it being an interesting 

 coincidence that both infusorians are members of the same 

 order. 



Podophrya bracliypoda, sp. no v. (PI. XV. fig. 4.) 



Body subspherical or broadly pyriform, commonly rounded 

 posteriorly, subsessile, the pedicle being very short and incon- 

 * 'American Journal of Science/ July 1884, p. 38. 



