Maskell. — 0)1 Freshivater Infusoria. 53 



A variation of this infusoriau, which might perhaps be 

 a new species, was observed on one occasion, but not sufficiently 

 examined. The cuirass was nearly twice as long as broad, 

 almost ovate, and the posterior extremity exhibited a narrow, 

 not very deep, slit. 



Class II. CILIATA. 



Order. Holotrioha. 

 Genus Paramoecium. 



Paramoecium aurelia, Miiller. Wellington, Wainui, Hutt 

 Valley. 



Paramoecium hursaria, Ehrenbergj. Wellington, Hutt 

 Valley. 



Genus Prorodon. 



Prorodon sulcatus, sp. nov. Plate III., fig. 4 ; a, b. 



Animalcules free-swimming ; motion gliding, sometimes 

 rotatory, not rapid. Body persistent in shape, cylindrical, 

 ovate, slightly narrowed anteriorly, longitudinally furrowed 

 by numerous, somewhat deep, striae. Oral aperture terminal, 

 narrow; pharynx narrow, cylindrical, somewhat deep, armed 

 with numerous rod-like teeth which are very inconspicuous. 

 Nucleus band-like, curved, sub-central. Contractile vesicle 

 single, at the posterior extremity. 



Length, ^^ inch = 83 /x ; greatest width, about ^^ 

 inch = 62 fj.. 



Wellington, W. M. Maskell. 



No mention appears to be made in descriptions of recorded 

 species of the longitudinal furrows mentioned above. These 

 show as conspicuous strife in viewing the animalcule on the 

 side; but in end view they become apparent as furrows. Other 

 differences from F. niveus, P. teres, etc., are size, the narrowness 

 of the pharynx, and the inconspicuous rods. After treatment 

 with iodine, a kind of protrusion of the oral aperture is some- 

 times visible. 



Genus Trachelophyllum. 



Trachelophyllum apiculatum, Perty. Mungaroa. 



Genus Coleps. 



(Joleps hirtus, Ehrenberg. Wellington, Wainui. 



Genus Tillina. 



Tillina enormis, sp. nov. Plate III., fig. 5. 



Anunalcule free-swimming ; motion rapid, gliding, some- 

 times spiral. Persistent in shape, elongated, scarcely showing 

 any reniform outline ; length about three times the greatest 

 width. Oral aperture ventral, slightly in advance of the median 

 line ; simple, firinged with cilia longer than those of the body ; 



