60 ON SOME AUSTRALIAN TERTIARY 
septa are only rudimentary ; so that if we found this coral in its 
young stage we should have no fourth cycle of septa, and no 
primary and secondary costa. Thus the costa would alternate with 
the septa. We see in this, probably, a proof that an extra cycle of 
costa shows that a cycle of septa to correspond with them either 
will appear or is aborted. It would be very interesting to learn 
if there are tentacles in the animal to correspond with the extra 
cle of costa, or organs of any kind that will account for the 
which an imperfect knowledge of the plan of nature has rendere 
apparently anomalous, and which may eventually lead to a more 
sound system of classification than that at present adopted. 
Class, Poryzoa. Order, Infundibulata. hag order, Cheilosto- 
mata. Section, Inarticulata. Sub-se ion, Bi-multiserialia 
Family, Gemellariade. Cells canna in pairs 
The fossil which I am about to describe is close to Gemellaria, 
— = cells are ae back to back, and all the pairs face 
the sa ee But in this species the faces alternate in two 
rine sere is of generic value, I propose the name 3 of Tetra- 
plaria for the genus. A fossil similar to this has been included 
in the genus Cellaria by A. E. iocene form of 
SCHREIBERSI. C. Shree. raro — cellulis quadrifariis 
ovatis aut semt-cylindraceis, plus minusve convexis, medio punctatis 
_ a supera, immersa, late slleption poris duobus minimis later- 
a . 
The specimen figured by me differs from this in the cells ee 
smooth and not punctate. 
* This fossil coral has been described by me in the Proceedings of the 
Adelaide Philosophical Society for this year, along with all the corals found 
eo Professor Tate in the Aldinga beds. 
Ps aay Fossile Polyparien des Wiener Tertiar Beckens. Vol. 2, p. 63, plate 8, 
> Shp Sl 
