44 A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 



B. Living. New Zealand. 



I have no doubt this is the species so named by Waters, although my 

 specimens differ from his description and figures in the slighter arching of the 

 upper edge and the somewhat different form of the avicularia. The calcareous 

 overgrowth gives it a very peculiar and characteristic ajmearance. 



Lunulites, Lamouroux. 



Zoarium usually more or less orbicular, convex on the anterior surface, plain 

 or concave on the dorsal. Zocecia elongated, with much raised, highly calcified, 

 sloping, granular or crenulated margins ; area partly filled in below and occasionally 

 on the sides by a calcareous granular lamina, which slopes downwards from the 

 margins. Vibracularia large, usually in special tracts between the zocEcial series, 

 but occasionally situated at the summit of a zoceciuin (Cupularia) or irregularly 

 interspersed. 



Lunulites, including Cupularia, and Selenaria are usually considered to con- 

 stitute a distinct family, distinguished by the discoid or orbicular form of the 

 zoarium, which also seems to be generally free and unattached, and by the presence 

 of powerful vibracularia. The structure of the zocecia, however, is so entirely 

 membraniporidan that it seems to me they should be included in that family. 

 This view has already been held by Gregory, Koschinsky and others. Busk has 

 distinguished Lunulites by having the vibracularia in separate tracts between the 

 zocecial series, Cupularia by having a vibraculum at the summit of each zoceciuin, 

 and Selenaria by having some of the zocecia, scattered irregularly among the others, 

 of a different form and furnished with vibracula. In the present paper I distinguish 

 the genera by the structure of the zocecia, a division founded merely on the 

 arrangement of the vibracula bringing together species structurally different and 

 separating others in which the zocecia are similar. Cupularia should, I think, be 

 included in Lunulites. 



1. L. parvieella, Tenison Woods, sp. PI. VII., figs. 1, 2. 



Selenaria parvieella, T.Woods, T.R.S.S.A., 1879, p. 10; Waters, Q.J.G.S., 

 1883, p. 441. 



Zoarium nearly flat. Zocecia in radiating lines, broad, distinct; margins 

 granular, sloping downwards and inwards to the aperture, a large, granular sloping 

 lamina below ; aperture occupying about two-thirds of the area, narrower above, 

 slightly contracted in the middle ; vibracularian cells situated irregularly between 

 the zocecia, narrow pyriform, very long, the margins sloping and granular. Dorsal 



