nV \V. N. BEXSOX, W. S. DIX, AXD \V. R. BROWNE. 3(j7 



CrcLOiDOTRYPA AUSTRALis, geii. et sp. uov. (Plate xxiv., flg-s, 3, 4.) 



Description. — Zoarium encrusting; surface maculae sub-circular, slightly 

 larger than the surrdundiug zooecial tubes. Vesicular tissue ra»'e. Tabulae very 

 irregularly developed. Diameter of a typical zoarium, about 7 nun.; diameter of 

 a macula, .33 mm. 



Observations. — Tliis genus is of later appearance than the typical Ci/clotri/pa 

 (Devonian of North America). The character of the central zooecial openings 

 (maculae), being typically sub-circular or ovoid, as -well as the open-structured 

 and rare vesicular tissue, seem to distingiiish thri Lower Carboniferous fossil. 



Occurrence. — Lower Carboniferous. Parish of Moorowarra, New South 

 Wales. 



Order TREPOSTOMATA. 



Genus li .V I, L o IM) R A Bassler (Callopora J. Hall pre-occupied.) 

 Hallopok'a froticosa, sp. nov. (Plate xxiv., figs. 5, 6, 7.) 



Description. — Zoarium at first encrusting, then bluntly ramose or bushy. 

 Zooecia sub-circular or ovoid, surrounded by polygonal mesopores, sometimes very 

 abundantly developed. Zooecia tabulate at distant intervals; mesopcres tilled 

 with vesicular tabulae. Walls of zooecia thick, of the mesopores thin. Dia- 

 meter of a branch, 3.4 mm.; diameter of zooecia, circ. .33 mm. 



Occurrence. — Lower Carboniferous. Parish of Moorowarra. New South 

 Wales. 



Note. — The range of this genus in North America is from the Ordovician to 

 the Devonian. 



(ii.) A Comparison of the Burindi Fauna v.-ith the Lower Carboniferous 

 Faunal Succession in the British Isles. 



(W. N. Benson.) 



The discussion of the Burindi Beds in an earlier paper in this series laid 

 stress on the fact (first brought to the writer's notice by Dr. Stanley Smith) that 

 the occurrence of Lithostrotion in this series uf beds indicates that some portions 

 at least of it are newer than the lowest Carboniferous rocks. As remarked (p. 

 269), "Dr. Vaughan (37) states, e.g., 'Lithostrotion both massive and dendroid, 

 enters the early Visean' (Upper Moiety of the Lower Carboniferous) 'in North 

 America, Britain and Belgium. It may be, therefore, that the true base of the 

 Carboniferous System lies at some unrecognisable horizon in the Barraba Mud- 

 stone. For the purpose of mapping, however, the base of the Burindi Series 

 is the lowest recognisable horizon that can be traced." 



One of the objects of the detailed palaeontological study of these beds was to 

 discover its bearing upon this point. For this purpose, the stratigiaphically 

 classified lists of Carboniferous forms given by Davidson for Scotland (31) and 

 by the late Dr. Vauv:luin (34, 35. 36, 37, 38, 39),* Sibly (40, 41, 42, 43), Douglas 

 (44). Garwood (45). and Parsons (46) have been examined to ascertain the 

 position of forms with representatives in New South Wales. The results hav-e 

 been noted in regard to Britisli forms described on the previous pages. The 

 significance may be considered briefly. The stratigraphical classification and 



•Unfortunately tlie modern investigation of the Carboniferous Eocks of Bela;iuni by 

 Carpentier, Delpine and Dordolot, cited by Vauglian (39), are not accessible to the writer 

 at the present time. 



