48 A. ©. Stokes—Fresh-water Infusorva. 
be the ventral, Stein’s genus would still be unable to receive 
the infusorian, since the short flagellum would then take 
So 
atom of vitality, it seems to demand recognition as the type 
of anew genus, of which the following may be taken as the 
diagnosis. 
acute, slightly projecting apex; the posterior bo 
rowing, the extremity convex but somewhat truncate; ventral 
aspect smoothly convex; dorsal groove narrowest at its ante- 
rior origin, widening and thence continuing evenly to its pos- 
terior termination ; flagella diverse in length and thickness, the 
longer and larger, once to one-half times as long as the body, 
inserted at the apex, and commonly held stiffly and obliquely 
in advance, the distal end alone vibrating; the shorter trailing, 
about one-third the length of the body, slender, arising from a 
point at a little distance from the anterior apex of the convex 
or dorsal surface; endoplasm granular especially posteriorly ; 
contractile vesicle single, small, located anteriorly near the 
right-hand border ; nucleus obscure, apparently placed subcen- 
trally near the left-hand margin. Length of the body 5;4,; to 
stsy inch. Habitat—Standing water with Myriophyllum. 
Solenotus orbicularis, sp. nov.—Body suborbicular, the ante- 
rior apex obtuse, the posterior extremity rounded not truncate, 
the posterior one-half of the left-hand border angular; dorsal 
groove broad and shallow; ventral surface evenly convex ; 
flagella, nucleus and contractile vesicle similar to those of the 
receding species. Length of the body with s4,5 inch. 
abitat—Near the bottom of the shallow water of small 
ols. 
PeThis infusorian (fig. 10) differs from that described as Sole- 
us, chiefly in its contour, its shorter’ dorso-ven- 
tral or vertical diameter, and in the shallowness and greater 
