the margined ribs of the under surface, but in all other respects 

 they differ completely. As far as we know, none of the fossil 

 species have living representatives, but comparatively so little 

 is known of the living polyzoal fauna of our coasts that it 

 would be quite premature to assert that any of them are extinct. 

 It is, however, a remarkable fact that so far as we know there 

 are very few living representatives of the rich polyzoal fauna 

 of our tertiary beds. But I think it may safely be affirmed 

 that any one seeing the present collection of fossil Selenariadse 

 would not hesitate to pronounce them Australian in character, 

 and we may therefore assume that in Miocene times the polyzoa 

 had already acquired an Australian facies. I have observed 

 elsewhere that we could never expect to find in a fossil state such 

 genera as Catenicella, JSLenipea, &c, as their horny joints could 

 not resist decay, or would not fossilise. If, therefore, the 

 Australian Miocene fauua was more like the present, much of 

 the evidence of this must necessarily have perished.* 



Inasmuch as there can be no definite line drawn between 

 Lunulites and Cupularia, and because the latter generic name 

 has been already employed in another way by L'Orbigny, I 

 think it better to suppress the genus of Cupularia of Busk and 

 regard them all as Lunulites. I do not think Cupularia can be 

 maintained even as a sub-genus, becaiise — as will appear when 

 I come to deal with the genus Lunulites of Busk — -the same 

 individual may sometimes have the features of Cupularia in 

 one part and those of Lunulites in another. In order, however, 

 to correlate this part of my work with the labours of Busk I 

 will keep the species separate according as they present the 

 Cupularian or Lunulitic type. 



Genus Lunulites, Lamx. (Cupularia of Busk.) 



Avicularia accompanying every cell, but not disposed in 

 lines. 



LLecent Species. 



Lunulites (Cupularia) crassa, Spec. nov. 



PL I., fig la— 1c. 



Zoarium rather large orbicular, somewhat depressed, 

 roundly conical, solid, thick, dull yellow, margins thick 

 elevated. Zoooeeia pyriform rounded, but very little elevated. 

 Mouth pyriform with a raised margin, outside which there are 

 irregular pores. Vibracular pore round, conspicuous, above 

 narrow end of mouth. Under surface of zoarium, with an 

 oblique margin of cells, the rest of the concave surface a 



*Since the above was written a most interesting discovery of fossil species of 

 Catenicella has been made in the Geelong Miocene beds. 



