Maskell. — On Freshwater Infusoria. 50 



tapering rapidly to the pedicle. Peristome border not, or only 

 slightly, thickened. Ciliary disc moderately elevated, cilia in a 

 single row. Endoplast baud-like, curved, nearly transverse. 

 Cuticular surface granular. Contractile vesicle single, near 

 anterior margin. Pedicle annulated, branched. 



Length of body gi^ inch = 71 /u. 



Wellington, T. W. Kirk. 



Closely allied to O. cylindrata, Wrzes., but more cylindrical 

 and rough, without strise. 



Genus Vaginicola. 



Vaginicola crystallina, Ehrenberg. Karori. 



Genus Platycola. 

 Platycola longicollis, Kent. Wellington. 



Order. Hypotkicha. 



Genus Litonotus. 

 Litonotus fasciohi, Ehrenberg. Wellington, Wainui. 

 A specimen from Karori appeared to be also of this species, 

 but exhibited a number of transverse corrugations. 



Genus Chilodon. 



Chilodon cucullulus, Miiller. Wellington, Hutt Valley. 



Genus Loxodes. 



Loxodes rostrum, Ehrenberg. Wellington. Doubtful. 



Genus Stichotricha. 



Stichotricha remex, Hudson. Wainui. 



Genus Psilotricha. 



Psilotricha acuminata, Stein. Wainui. 



Genus Uroleptus. 



Uroleptus musculus, Miiller. Wellington, Hutt Valley. 



Genus Gastrostyla. 



Gastrostyla Steinii, Engelmann. Wainui. 



Genus Histrio. 



Histrio acuminatus, sp. nov. Plate IV., fig. 10. 



Animalcules elongate-elliptical, with nearly parallel sides, 

 somewhat pointed at the posterior extremity ; border evenly 

 ciliated. Peristome-field large, with long cilia and conspicuous 

 reflected border, ciliated on left side. Three large uncinate 

 frontal styles and a few smaller ventral setae. Five simple 

 anal styles, which project for about two-thirds of their 

 length beyond the posterior extremity. Contractile vesicle 

 single, situated just below the peristome-field. Endoplast 

 elongated, conspicuous. 



