1885.] 



MICKOSCOPICAL JOURNAL. 



187 



closing the peristome field, the adoral 

 cilia being tlirown inwards, some of 

 them arcliing above the oral region, 

 the frontal setas then being almost 

 parallel and tlirected forwards. 



Scvp/iidia coustricta. sp. nov. 



(Fig": 7)- 



Body elongate, gibbous, about 

 three times as long as broad, con- 

 stricted beneath the even, everted 

 peristome border ; widest near the 

 centre, tapering posteriorly to the 

 short intermedium of attachment ; sur- 

 face finely striate transversely ; ciliary 

 disc small, slightlv elevated ; con- 

 tractile vesicle single, spherical, 

 placed near the termination of the 

 vestibulum ; contracted body ovate, 

 curved, strongly and transversely pli- 

 cate on the concave side, the anterior 

 border protruding as a conspicuous 

 snout-like projection ; parenchyma 

 transparent, granular. Length of 

 body jl-g- inch. Habitat. — Pond 

 water ; on Nais. often attached in 

 pairs or in clusters of three or four. 



In contour this resembles S. incJi- 

 nans (D'Udek), S. K., but it is 

 readily recognized as a distinct form 

 by the conspicuous anterior construc- 

 tion, the more posterior position of 

 the pulsating vacuole, and by the 

 transversely striated cuticular surface. 

 When contracted, although the two 

 still resemble each other, they may 

 be diagnosed by the presence, with 

 6". C(9?z5/r/c/a, of the prominent snout- 

 like projection of the frontal border. 



Uroleptus Ihnnetis^ sp. nov. (Fig. 

 8). 



Body elongate, sub-fusiform, five 

 times as long as broad, widest cen- 

 trally, tapering posteriorly to a tail- 

 like prolongation forming about one- 

 fifth the length of the entire body ; 

 constricted anteriorly into a neck-like 

 portion, less in diameter than that of 

 the body-centre, and about one-fourth 

 the entire body in length ; frontal 

 border expanded, rounded, the lip 

 conspicuous, cresceiTtic ; peristome 

 field extending to the base of the 

 neck-like constriction, the right-hand 

 margin ciliate ; frontal styles three ; 



ventral sette in two closely approxi- 

 mated median lines, beginning im- 

 mediately behind the frontal styles 

 and continued through the caudal ex- 

 tremity ; marginal setce projecting, 

 largest and most numerous posterior- 

 ly ; contractile vesicle single, spheri- 

 cal, on the left-hand side near the 

 apical extremity of the peristome field ; 

 nucleus doubie, ovate : immotile dor- 

 sal setae long and numerous. Length 

 of body y4-(j inch. Habitat. — Pond 

 water, with Lemna ; marsh water, 

 with Sphagmim. 



In its extended form this resembles 

 the contracted condition of Urolep- 

 tus lo7igica7idatus^ Stokes, but, aside 

 from the absence of the prolonged 

 caudal extremity of the latter, difl'ers 

 in the absence also of the undulating 

 peristomal membrane. The anal 

 aperture was not observed. It, how- 

 ever, probably opens on the dorsal 

 surface, as is so frequently the case 

 in membei"s of the Hypotricha. 



Stylonyc/iia pntrina^ sp. nov. 



(Fig. 9)- 



Body elongate elliptical, less than 



three times as long as broad ; the 

 frontal extremity slightly widest, the 

 posterior border evenly rounded or 

 truncate ; lateral margins flattened, 

 almost parallel, or the left-hand bor- 

 der somewhat concave ; peristome 

 field extending to near the centre of 

 the ventral surface, the right-hand 

 border ciliate and bearing an undu- 

 lating membrane ; marginal setae 

 large, projecting posteriorly only ; 

 four of the five anal styles extending 

 beyond the posterior border ; caudal 

 setae short, arising from the dorsal 

 surface ; nucleus double, ovate ; con- 

 tractile vesicle single, on the left-hand 

 side ; immotile hispid setae short, ar- 

 ranged in four longitudinal lines on 

 the dorsum ; endoplasm often filled 

 with dark granules. Length of body 

 r? 5 t^ ^oT) inch. Habitat. — A stale 

 vegetable infusion. Movements rapid 

 and erratic. 



This is readily distinguishable from 

 other species by the shape of the 

 body, the elongated, subelliptical 



