236 C. M. M<ii>lpst<we: 



such an organ has not hitherto been found in a similar position 

 in any allied form of Cyclostomata. I have placed it provision- 

 ally in Diastopora, but it probably, on account of the peculiar 

 lenticular cavity, will require a new genus (if not family) for its 

 reception. I have named this species after the late John 

 Dennant, from whom I received the material from which it and 

 many other new species were obtained. 



Tubulipopa mapgaritacea, n. sp. PI. VIII., Fig. 11). 

 Zoarium small, ligulate, 2 mm. long; 0.8 wide. Zooecia cylin- 

 drical, partly immersed. Thyrostome tubular, exserted ; surface 

 slightly rugose, but porcellanous. Length of zooecia, 0.3 to 0.9 

 mm. ; diameter, 0.18 to 0.15 mm. 



Locality, Clifton Bank, Muddy Creek (T. S. Hall). 



A single specimen, noticeable on account of the shining 

 porcellanous surface. This genus has not hitherto been re- 

 corded from our Tertiary strata. 



Tubulipora minuta, n. sp. (PI. VIII., Fig. 12). 

 Zoarium small, 1.5 mm. long; 0.6 mm. wide, ligulate. Zooecia 

 very small, immersed. Thyrostomes 0.05 in diameter, exserted 

 0.1 to 0.25 mm. Ooecia inflated, embracing many zooecia; 

 surface granulated. 



Locality. Mitchell River (J. Dennant). 



A single specimen. Zooecia totally immersed, Avith the tubular 

 orifices projecting at nearly right angles to the surface. 



Reticullpora airensis, n. ap. (PI. VIII., Fig. 13). 

 Znarium reticulate ; branches subtriangular in section, upper 

 portion sublineate, showing the edges of the two zoarial laminae. 

 Zooecia on both sides of the branches, elongated, somewhat 

 flattened on the surface. Thyrostomes disposed in a more or 

 less regular transverse series of five to seven. Length of zooecia 

 0.3 to 1 mm. ; breadth, 0.1 to 0.15 mm. 



Locality, Aire Coastal beds (Messrs. Hall and PritchardV 



The specimens are very fragmentary . but show that the 



fenestrae are more or less angular, quadrate or diamond-shaped. 



This sipecies in appearance is verj'- similar to Crisina {Rete- 



crisina) obliqna, D'Orbigny, as described and figured by Dr. 



Gregory in his " Catalogue of the Cretaceous Bryozoa in the 



