The genera of the family are five in number, which are thus 

 distinguished — 



Cupulabia, Lamouroux. — Eacli cell with a vibracular chamber 

 at its apex or distal extremity. 



Lunulites. — The cells and vibracular chambers disposed in 

 separate, usually alternate, rows radiating from the centre. 



Selenaria, Busk. — Some of the cells only of a different form 

 from the rest and furnished with a vibraculum. 



Stichopora, Hagenow. — No apparent vibracular cells. 



Conescharelltna, D'Orbigny. — No vibracula ; mouth of 

 cell circular. Avicularia present. 



Hitherto only from Australia species have been described — 

 one Cupula ria and three Lunulites. The latter, according to 

 Busk, are representatives of fossils found in the Cretaceous 

 period — another interesting link between Australia and Meso- 

 zoic forms. There are five species recorded from the Pliocene 

 formation, eight from the Miocene, seven from the Eocene, and 

 eighteen from the Cretaceous. Of the latter species only one 

 is a Cupularia and two Stichopora, and the rest, fifteen in num- 

 ber, are Lunulites. 



Cupularia is now our largest genus, but the existing species 

 of Lunulites are very much larger in size than the fossil forms, 

 if we except the giant species, L. magna. 



I have now to introduce to science twelve new species and a 

 variety in this interesting and very beautiful family of 

 organisms, namely, two species of Cupularia, five of Lunulites 

 and five of Selenaria. Of these four are living and eight fossil. 

 The recent forms are all from the east coast of Australia. The 

 fossils are chiefly from the Muddy Creek Miocene beds of 

 "Western Victoria, but the following South Australian localities 

 have contributed to the list : — Mount Gambier, polyzoal lime- 

 stone ; Upper Murravian beds at Morgan, and the inferior 

 beds at Blanche Point, Aldinga Bay. Australia has been 

 already celebrated for being the only surviving home of the 

 almost extinct genus of Lunulites ; and it is interesting to 

 observe that there is a new living form of that peculiar solid 

 type, which has been figured and described by Busk. Our four 

 fossil forms are different from those already known. 



Both the living and extinct Cupularias are new forms of 

 much interest, but the relations of the fossil species are remote 

 to any living or extinct form. 



There has hitherto been only one known species of Selenaria, 

 occurring on the south coast of Australia. To this I am 

 enabled to add two others, very distinct from their congener, 

 and three fossil forms, all of extreme interest and beauty, and 

 of a distinct type. One of them has a peculiarity in common 

 irith one of the new living species here described, that is in 



