58 Transactions. — Zoology. 



the greater number are collected in two groups at the extremi- 

 ties of the foot. Neck-like region long, slender, compressed, 

 elastic, bearing numbers of short fine cilia. Anterior portion 

 or head variable in form from triangular to oval ; peristome- 

 cilia long and conspicuous, surrounding the large oral aperture. 

 Nucleus oval, inconspicuous, situated in the foot-region. Con- 

 tractile vesicle not observed. 



Length variable, from -g^ inch = 28 /x when contracted, 

 to -g^-Q inch = 71 fi when extended. 



Welhngton, W. M. Maskell. 



This is the first species of the genus as yet reported in 

 fresh water. It is somewhat larger than either of the two 

 European marine animalcules, and differs also in the presence 

 of strong setffi, instead of cilia, on the foot-region. 



Genus Vorticella. 

 Vorticella annularis, Miiller, Karori. 

 Vorticella longijilum, Kent. Wellington. 

 Vorticella campanula, Ehrenberg. Wellington. 

 Vorticella cratera, Kent. Wainui. 

 Vorticella citrina, Ehrenberg. Wellington. 

 Vorticella zealandica. Kirk. Wellington. 

 Vorticella elongata, De From. Wellington. 

 Vorticella patellina, Miiller. Wellington, Wainui. 

 Vorticella nebuli/era, Ehrenberg. Wellington. 

 Vorticella aperta, De From. Wellington. 

 All the above species are reported by Mr. T. W. Kirk, in 

 " Trans. N.Z. Inst.," vol. xviii., 1885, p. 215. 



Genus Zoothamnium. 



Zoothamniiim affine. Stein ; var. granulatum, var. nov. 



Eesembles almost entirely the European infusorian, but has 

 a longer pedicle and a rough granular surface. It was also not 

 observed on aquatic animals, but on plants. 



Wellington, A. Brandon. 



Genus Epistylis. 



Epistylis leucoa, Ehrenberg. Wellington. 



Ehrenberg's species, according to Kent, p. 705, has not been 

 observed for many j^ears. The present infusorian agrees with it 

 entirely, with the exception that the surface is granular and the 

 colonies larger, containing 20 to 85 individuals. 



Genus Opercularia. 

 Opercularia parallela, sp. nov. Plate IV., fig. 9. 

 Body slender, about three times as long as broad, sides 

 parallel for about two-thirds the length from the margin, then 



