Polyzoa Entoprocta and Ctenostomata . 37 
canal. This is due partly to the different states of contraction in which different 
polypides are killed and partly to changes induced by growth and other physiological 
conditions. 
There are apparently about 16 tentacles. In contracted specimens I cannot see 
the collar. 
The star -shaped aperture by means of which a zooecium communicates with its 
parent and daughter zooecia are clearly defined and easily seen in this species (fig. 
8A). There is no trace of a funiculus in connection with them. They are always 
surrounded by wandering cells, which may sometimes be seen actually over the 
aperture. The rays of the star-like aperture frequently bifurcate so as to produce a 
Fig. 8. — Hislopia nialayensis, sp. nov. 
A.— Orifice between two zooecia as seen from within distal zooecium, showing wandering cells 
( X 542). B. — Optical section of wall of circular chamber ( x 542). 
I = circular muscle-fibre 2 = internal cellular layer. 3 = horny lining of chamber. 
somewhat complicated figure. At the points at which buds are given off or a daugh- 
ter zooecium is attached to its parent, the flat marginal membrane is interrupted and 
a short peduncle is developed to form the actual linking structure. When adjacent 
zooecia not originally connected are pressed together by the growth of the colony , as 
in the preparation figured on plate i, fig. 9, the membrane of the older or more 
vigorous zooecium often grows over the membrane or over a part of the roof of the 
younger or less vigorous. 
The ovaries are scattered round the periphery of the zooecial chamber and each 
produces several ova. The testes probably occur similarly but are not developed in 
the preparations I have examined. It is possible that the colonies are unisexual. 
