Maskell. — On Freshwater Infusoria. 13 



Otaki, in company with Strombidium, TV. M. Maskell. 



This form is more angular and jar-shaped than M. acarus, 

 Stein. M. recurmm, Kellicott," has two rings of cilia. M. fun- 

 briatum, Stokes, I has cilia with divided ends. 



Genus Carchesium. 

 Carchesium polypinum, Linn. Hutt Valley. 



Genus Zoothamnium. 



Zoothamnium limpid/urn, sp. nov. Plate III., fig. 19, a, h. 



Animalcules regularly campanulate, similar in shape and 

 size when expanded ; surface smooth ; colour white ; placed on 

 branches of a long, thick, quite smooth retractile pedicle, the 

 whole contracting together (the muscular fibre being continuous, 

 Fig. 19, b) ; peristome-edge of medium thickness, slightly 

 recurved. Contractile vesicle single, sub-central. Nucleus 

 doubtful. The pedicle is, proportionately, a good deal longer 

 than usual in the genus. 



Length of bodies, about 3^ inch =83 p. Pedicle sometimes 

 nearly ■£$ hich long before branching. 



Wellington, C. P. Powles. 



The general smoothness and clearness of the whole zooden- 

 drium, and the comparatively great length of the pedicle, 

 distinguish this form. 



Genus Epistylis. 



Epistylis anastatica, Linn. Hutt Valley ; parasitic on Daphm'a 

 pulex. 



Genus Opercularia. 



Opercularia nutans, Ehrenb. Wellington. 



Genus Thuricola. 

 Thuricola valvata, Wright. Hutt Valley. 



Genus Cothurnia. 

 Cothurnia parallela, sp. nov. Plate III., fig. 20. 



Lorica transparent, sub-cylindrical, never ovate, the margin 

 sometimes everted, sides straight and parallel ; pedicle always 

 very short, smooth, and slender. Animalcules not occupying all 

 the width, and projecting when extended nearly half their 

 length ; colour white ; peristome-edge net recurved. Contrac- 

 tile vesicle single, situated below the peristome ; nucleus 

 elongated, sub-central. 



Length of lorica, 246 mcn = 100 p (including pedicle) ; 

 length of pedicle, 7^55 mcu = 4 p- 



* " Proc. Amer. Soc. Micros.," 1885. 



t " Journ. Eoy. Micros. Soc," Feb., 1887. 



