288 Prof. Ludwig Will: Bericht über die wissenscbaftl. Leistungen 



long, flexible seta projecting from the posterior extremity; oral aper- 

 ture ventral, supplemented by a vibratile and retractile hood-like 

 velum) m, S. agitatvs St. 87, Calyptotricba inhaesa (Kellik) St.; 

 Farn. Pleuronemidae S. K.: Pleuronema chrysalis (Ehr.) S. K., 

 Cyclidinm glaiicoma Ehr., C. litomesum St. 84, Uronema marina 

 Duj.; Farn. Trichonymphidae S. K.: Trichonympha agilis Leidy, 

 Pyrsonema vertens Leidy, Dinenympha gracilis Leidy; Farn. Opa- 

 lini dae Stein: Opalina ranarum Purk., 0. flava St. 84, Anoplophrya 

 clavata (Leidy) S. K., A. cochleariformis (Leidy) S. K., A. socialis 

 (Leidy) S. K., A. vermicularis (Leidy) S. K., A. notei Foulke, A. fiini- 

 culus Leidy, A. modesta Leidy, A. melo Leidy; Farn. Bursa riidae 

 Stein, Bursaria truncatella Müll., Nyctotherus ovalis Leidy, N. 

 velox Leidy, Metopus sigmoides Mull., Metopides striata (Mc. 

 Murr.) St., M. acvmiyuän St. 86, gen. Ctedoctema St. 84 (free 

 swimm., more or less ovate, persistant in shape, entirely ciliate; 

 oral cilia diverse to those of the cuticular surface; oral aperture ventral, 

 located at the posterior termination of a longitudinal, ciliated, 

 adoral depression or groove, which bears on its right-hand border a 

 row of large, arcutely curved setose cilia, gradually diminishing in 

 length toward the oral aperture, their distal extremities conspicu- 

 ously thickened; a single, long, setose hair projecting from the pos- 

 terior extremity of the l3ody, the distal end curved; contractile 

 vesicle single, posteriorly placed; trichocysts large and numerous) 

 m. C. acanthocrypta St. 84; Farn. Cyrtolophosiidae St.: gen. 

 Cyrtholopkosis St. 85 (Anim. ovate, the anterior extremity bea- 

 ling a fascicle of long, distally curved, vibratile hairs ; secreting and 

 inhabiting a A\ariously modified, mucilaginous, granulär zoocytium, 

 to which they are in no way attached und from which the may pass 

 at will; oral apert. at the poster. extremity of an excavated, elon- 

 gated groove, longitudinally traversing the anterior part of the ven- 

 tral surface, bearing on its right-hand margin a series of cirrose, 

 adoral cilia; nucleus und contractile vesicle 1, conspicuous; anal 

 aperture postero - lateral) m. C. mucicola St. 85; Farn. Spiro sto- 

 midae S. K. : gen. Apgaria St. 84 (Body irregularly ovate, more 

 or less flattened or lamellate, entirely ciliate, soft, flexible, transparent 

 and somewhat changeable in from; the anterior extremity slightly 

 curved toward the left-hand border, and tei-minating in a more or 

 less beak-like apex; the posterior extremity with a retractile tail- 

 like Prolongation; the right-hand body-margin convex, the left-hand 

 border somewhat sigmoid and bearing an elongate-ovate groove or 

 depression extending backward and obliquely inward, the oral aper- 

 ture being at its posterior part widest and deepest; pharynx tubulär, 

 anteriorly curved, expansile and ciliated; the left-hand edge of 

 peristome field bearing a single row of long vibratile adoral cilia 

 continued around the mouth and into the pharynx, the basal por- 

 tion of the right-hand margin occupied by a conspicuous, lamellate, 

 undulating membrane; cuticular cilia fine, clothing the longitudinal 

 surface furrows: nucleus moniliform or rounded, subcentrally 



