Maskell. — On Freshwater Infusoria. 17 



Genus Opisthotricha. 



Opisthotricka parallela, Engelm, var. minor, var. nov. Plate 

 IV., fig. 27. 



Agrees with the European species in everything but its size, 

 which is only 3 L inch =70 ^u. This dimension was constant 

 in a great number of specimens examined. 



Genus Euplotes. 

 Euplotes charon, M idler. Karori, Hutt Valley. 



Class III. TENTACULIFERA. 



Order. Tentaculifeba- Suctoria. 



Genus Trichophrya. 



Trichoplujra epistylidis, C. and L. (?) Hutt Valley. 



The specimens examined appeared nearly identical with this 

 species, but the tentacles could not be resolved into clearly 

 separate fascicles, seeming rather to be irregularly scattered 

 over the whole body. The animalcules were all on stems of 

 various Alga : none were observed parasitic on Epistylis. 



Genus Acineta. 

 Acineta flos, sp. nov. Plate IV., fig. 28. 



Lorica cup-shaped, width nearly equal to the length, anterior 

 margin deeply cut and produced in several fine points, which 

 bend over slightly inwards ; pedicle very little more than half 

 as long as the lorica, very slender. Animalcule sub-globular, a 

 little dilated at the anterior edge, occupying only the upper 

 portion of the lorica ; bearing numerous fine tentacles which 

 protrude between the points of the lorica. 



Length of lorica, exclusive of pedicle and points, ^o mcn — 

 33*3 p.. 



Wellington, C. P. Powles. 



Allied to A. mystacina, Ehrenb., but very much smaller; 

 also the lorica is wider and rounder in proportion. 



Acineta cmgularis, sp. nov. Plate IV., fig. 29. 



Lorica trapezoidal, the sides below tapering sharply and 

 straight down to the pedicle ; anterior edges angular, produced 

 into two sharp points, which bend over leaving openings at the 

 sides. Pedicle nearly as long as the lorica, tapering to a fine 

 point at the base, wider above. Animalcule irregular, widest 

 anteriorly, occupying only the upper part of the lorica and 

 bearing two fascicles of capitate tentacles, which protrude through 

 the side openings. Contractile vesicle posteriorly situated. 



