1890.] ' •' [Stokes. 



filling the cavity of the lorica. Length T i ff inch. Hah. — Standing pond 

 water, attached to the rootlets of aquatic plants. 



Solenophrya alata, sp. nov. Fig 25. — Lorica, when viewed laterally, 

 irregularly ovate, depressed, longitudinally traversed hy five broad, thin, 

 equidistant, perpendicular and anteriorly converging alse, their free mar- 

 gins irregularly undulate, aud their height varying, usually being greatest 

 near their centre ; posterior border evenly convex, the anterior narrowly 

 concave and alate. Lorica when viewed from above pentagonal, a longi- 

 tudinally disposed ala originating from each angle, converging anteriorly 

 and meeting at the summit of the sheath which is apparently continuous 

 across the frontal region ; enclosed animalcule almost entirely filling the 

 cavity of the lorica, the tentacles capitate, protruding through the alae ; 

 endoplasm granular ; nucleus obscure, apparently ovate and subcentrally 

 located ; contractile vesicle single, posteriorly placed near one border. 

 Diameter of the lorica -gfa inch, height ^^ inch ; length of each of the 

 five sides -${-$ inch. Hal). — Attached to the rootlets of Lemna. 



Apgaria purpurascens, sp. nov. — Body elongate ovate, longitudinally 

 furrowed, anteriorly flattened, in general outline and aspect resembling 

 A. elongata ; endoplasm deep reddish purple in color; nucleus double, 

 ovate, the nodules situated/ in the posterior and the anterior body-halves 

 respectively, and connected by a funiculus ; contractile vesicle double, 

 located near the posterior extremity. Length of mature forms r ^ inch, 

 the length being from three to four times the width. Hab. — Pond water, 

 and on the lower surface of water-lily leaves, near Minneapolis, Minn. 



This beautiful and interesting form was originally discovered by Dr. P. 

 L. Hatch, of Minneapolis, where it was abundant, and specimens were 

 kindly sent to me. From A. elongata, which it resembles in general 

 contour, it differs widely in three important particulars : the remarkable 

 deep purplish-pink color of the parenchyma, in the double nucleus with 

 a funiculus connecting the nodules, and in the great size. A. elongata, 

 the most nearly related species, is colorless, it has but a single nucleus, 

 and is in size only about 3^ inch in length. Reproduction with the form 

 here referred to as Apgaria purpurascens takes place by transverse, often 

 somewhat oblique, fission. 



Ilomalozoon {otj.aXoc;, flat ; ftoov, body), gen, nov. — Animalcules free- 

 swimming, hypotrichous, soft, flexible and elastic ; elongate, much de- 

 pressed, the anterior border obliquely rounded, thickened and abundantly 

 supplied with trichocysts ; oral aperture terminal, very expansile ; no differ- 

 entiated neck-like prolongation ; ventral surface flattened, entirely ciliated. 



In the Annals and Magazine of Natural History for August, 18S7, the 

 writer described an Infusorian under the name of Litonotus vermicular i<>, 

 relegating it to that generic group with much doubt and hesitation. In 

 the Journal of the Trenton Natural History Society for January, 1888, the 

 diagnosis is republished without comments, and without any expression of 

 that doubt as to its proper position which was still felt by the writer. 

 Recently another Infusorian closely related to the one here referred to, but 

 differing from it specifically, has confirmed the opinion that the lormer 



