Tertiary Polyzoa of Victoria. 146 



Locality. — Mitchell River (J. Dennant). 



This a very good example of a dendroid Retepora. The zoaria 

 are generally without avicularia, but in the specimen of which a 

 figure, natural size, is given about a third of the middle portion 

 is covered with large, raised avicularia scattered over the surface 

 intei-fering with the regularity of, and almost obscuring, the 

 zooecia, but that part is not in good preservation so I have not 

 figured them ; on the lower and upper parts the zooecia are 

 regularly disposed and without avicularia ; the branches are not 

 the some plane, the upper one recedes and the middle and right 

 hand branches curve upwards. 



Retepopa complanata, n. sp. (PI. XVII., Fig. 12 and 12^). 



Zoarium reticulate, fenestrae elongated, oval. Zoecia subhex- 

 agonal, elongated, with raised margins ; surface finely granulated. 

 Thyrostome orbicular ; peristome raised, with a mucro pointing 

 inwards on the proximal margin where it expands in width and 

 in the expansion there is a small pore, probably avicularian. 

 Dorsal surface coarsely granulated, divided by raised vibices into 

 very large areas. 



Locality. — Mitchell River (J. Dennant). 



This is characterised by the extreme simplicity of the form of 

 the zooecia, and the very large areas on the dorsal surf.ace. 



This concludes the description of all those Cheilostomatous 

 species that I have been able, up to the present time, to deter- 

 mine as new in the material, from the various Tertiary deposits, 

 that has been kindly presented to me by INIessrs. Hall, Pritchard, 

 Dennant, Kitson and others. I have still a large number of 

 specimens undetermined, but I have had sent to me a great many 

 recent forms from South and North Australia, New Hebrides, 

 and other localities which ui'gently demand my attention, and of 

 which a cursory examination has shown me that many of 

 thein are new. I had intended postponing dealing with these 

 until after I had described some new species of fossil Cyclosto- 

 mata, but there is such a diflference of opinion as to the proper 

 classification of this order, and I see so much difficulty ahead in 

 determining their position, that I will leave them for a time ; 



10 



