6 Transactions. — Zoology. 



white or grey, translucent, with numerous greenish granules. 

 Anterior border obliquely truncate, slightly concave. Flagella 

 two, springing from the projecting angle, sub-equal in length. 

 Contractile vesicle single, somewhat posterior. Motion rather 

 rapid. 



Length xoVo mc ^ — ^'8 /x. 



Wellington, Hutt Valley, Karori, Otaki, W. M. Mas/cell. 



Wants the dark, band-like spot of (J. truncata, Fres.,and the 

 position of the contractile vesicle and generally more elongated 

 form distinguish it. 



Genus Rhipidodendron. 



Rhipidodendron splmdidum, Stein. Hutt Valley. 



The points noted as differentiating this from R. huxleyi, re- 

 ported in our paper of 1886, are the number of tubes m the 

 branching zoodendrium (seven to ten), their not being in the 

 same plane, and the protrusion of the animalcules in some cases 

 almost entirely beyond the tube-orifices, just as those delineated 

 in Saville Kent's Plate XVI., fig. 1. Curiously, Kent himself 

 says that in R. splmdidum the animalcules have " their flagella 

 only projecting ;" and he proceeds to figure, as just stated, the 

 animalcules themselves protruded ; so that one is apt to be 

 puzzled by the contradiction. The number of tubes, and their 

 situation in different planes, are taken as sufficient distinctions 

 herein. A further character may be the irregularity of the 

 bifurcations as compared with R. huxleyi. 



Order. Choano-Flagellata. 

 Genus Monosiga. 

 Monosiga brevipes, Kent. Hutt Valley ; on stems of Vorticella. 



Genus Codosiga. 



Codosiga botryUs, Ehrenb. Wellington. 



The only differences that close examination revealed between 

 this and tbe European species were that the colonies were much 

 less frequent, and the individuals of each less numerous, in the 

 New Zealand form. 



Genus Salpingaeca. 



Saipingceca inquillata, Kent. Plate I., fig. 5. 



A species only reported from salt-water in Europe. A figure 

 is given to show how closely the Wellington form approximates 

 to the European. The specimens were, however, collected not 

 far from the sea-shore, though in apparently quite fresh water. 



Length of lorica, -j-^tt inch = 10 p. 



Wellington, A. Brandon. 



