380 GREAT SERPI^XTINE BELT OF NEW SOUTH WALES, vii., 



cally, though distinct from forms in the Nemingha limestont% and 

 the Mur rum bid gee beds." 



[Ileliolitpfi 2^orosa. — This occurs in numerous large masses, the 

 exact shape of which is not apparent. Measurements of the 

 dimensions of the parts of the form agree exactly with those 

 given by Mr. Etheridge for corals of this species in the limestone 

 of Moore Creek (23). 



CJutiHps .^tdliforriiU, sp.nov., Chapman. — An account of this 

 form is given in Mr. Chapman's interesting note in the second 

 appendix to this paper. While he refers to the rarity with which 

 it occurs out of the Carbonifei'ous system, it is interesting to 

 note that De Koninck remarks that the specimen of Campo- 

 phyUiim^tJpxiiOfiimi received by him from Quadong was enveloped 

 in a mass of some size of Cluefetes (/o/d/)issi(9, p. 54)]. 



"The Stromatoporoids, w^hich form the best index of the age 

 of the Loomberah limestone, are well preserved. They are re- 

 presented by the forms StromafojwrpJIa loomhprfii^i^, S. hensoni, 

 and Acfinoi^froma aiisfralp, all new forms, and an indefinite species. 

 The appearance of these is distinctly Devonian, the forms closely 

 resembling typically Middle Devonian species. As has been 

 pointed out by Heinrich (24), the discrimination of the different 

 species of Stromatopora is extremely diHicult, and the final test 

 is the conventional use of measurements of the interlaminar 

 spaces, and the spacing of pillars. Numerous averages of mea- 

 surements have been taken in the case of Professor Benson's 

 specimens, and it is thought that the erection of new species is 

 justified." [As will be seen from the photographs in Plates 

 xxxvi., xxxvii., and xxxviii., all enlarged two and a half diame- 

 ters, and from macroscopic examination, the f<il lowing appear to 

 be the characteristics of these species: 



SfromafopovpUa loomhi'vensis. — The coenosteum is roughl}^ hemi- 

 spherical, sometimes reaching as much as 20 cm. in diameter. It 

 is divided into concentric latilaminie, about ."1 nnii. wide. The 

 vertical section (Plate xxxvi.) shows that the lamin.'e aie very 

 definite and continuous, except for the occasional presence of 

 crossinu' zooidal tubes. There are about sixteen lamime in the 



