360 C. M. Maptestone: 



rate in t'orni, smooth with slightly raised and faintly sinuous 

 margins. Thyrostomes oval, ooecia somewhat larger than the zooe- 

 cia, with a broad aperture below two smaller ones on the front 

 wall. Avicularian cells quadrate, with a large, somewhat hour- 

 glass shaped cavity. In the basal walls of the zooecia there is a 

 large aperture, and there is also an aperture on the side walls of 

 the zooecia. 



Locality. — Disaster Bay, N.S.W. (C. J. Gabriel;. A single 

 specimen. 



This is a very peculiar form; it is allied to Sele/iaria, and, in 

 the radial and linear disposition of the zooecia, to Lunulites. It 

 is a hemispherical dome (a small portion of which is broken away), 

 composed of a single layer of zooecia arranged in radial lines, inter- 

 calating towards the margin. The thyrostomes are oval, but some- 

 what i regular in form. The ooecia have a large, broadly oval aper- 

 ture, with two smaller ones above. The basal walls have a large 

 aperture, and there is also a smaller one in the side walls of the 

 zooecia, through which probably living tissue, connecting the occu- 

 pants of the adjoining zooecia, extended, It differs from Selenana 

 in having large avicularia, but not vibracula, and the ooecia are on 

 the same level as, and in series with, the zooecia, not exterior 

 as in Seleiiar/a, and by the zooecia being clearly defined on the 

 basal surface. 



Owing to the irregularity in the shape of the thyrostomes, and 

 in tlie presence of the large aperture in the basal wall, and also 

 the absence of the opercula of the thyrostomes and the mandibles 

 of the avicularia, I am of dpinion that the specimen exhibits the 

 internal calcareous structure only, and that in life it had an ecto- 

 cyst covering it entirely on both basal and upper surface in or 

 upon which were the true thyrostomes with their opercula, 

 also the mandibles of the avicularia, and that it covered 

 the basal surface, and the large aperture in the basal wall 

 of the zooecia, which is such a conspicuous feature, and which 

 must have had a covering of some kind. Consequently, if living, 

 or perfect, specimens be found, it will be necessarj' to modify the 

 description, but there is no doubt that its structure abundantly 

 justifies the establishment of a new genus for its reception. 



Parmulapia obliqua. (PI. XXVTTI., Fig. 11). 

 A new form fiom West Australia. 



The specimens of I'annularia obliqtia, from the Soutli Australian 

 coast, to which I alluded in my " Observations on I'armiiUiria 



