222 Dr. H. A. Nicholson and Mr. R. Etheridge, Jun., on 



scurus, De Kon. We may at once state that the Queensland 

 Alveolites forwarded by Mr. Jack in no way correspond to 

 any of these; indeed the two new species described by 

 Prof, de Koninck appear to us to be very unsatisfactorily 

 established, and nothing is known of their microscopic 

 structure. 



Alveolites (Pachypora?) , sp. ind. 



Obs. A ramose species, with affinities to Pachypora, and 

 possibly really referable to this latter genus. It is very like 

 A. (Cladopora) robusta, Rominger*, from the Corniferous 

 Limestone of North America. The surface-characters are 

 much destroyed by weathering ; and as its internal structure 

 shows nothing but mural pores and tabular, with no special 

 features of interest, little further can be said about it. The 

 coral may at once be distinguished from our Pachypora meri- 

 dionalis by its very oblique tubes and calices. 



The largest of the specimens before us (by no means a 

 perfect specimen) is 3^ inches in length. The distance 

 between two points of bifurcation or dichotomization of the 

 branches is 1 inch 3 lines. 



Locality and Horizon. Arthur's Creek, Burdekin Downs, 

 Devonian Limestone. 



Collector. R. L. Jack, Esq. 



Alveolites, sp. ind. 



Obs. An expanded, lobate, or palmate form, which, in the 

 present unsatisfactory and chaotic state of Alveolites, is very 

 difficult to determine, although, specifically speaking, we do 

 not know any thing precisely like it. Sections show that the 

 corallites were thin-walled and irregular, with mural pores 

 and plenty of tabula?. With the material before us we feel 

 we should be only unnecessarily increasing nomenclature by 

 bestowing a name, and therefore refrain. 



Locality and Horizon. Arthur's Creek, Burdekin Downs, 

 North Queensland. Limestone of Devonian age. 



Collector. R. L. Jack, Esq. 



Genus Heliolites, Dana, 1846 (?). 



(Zoophytes, Wilkes's U.S. Expl. Exped. p. 541.) 



Obs. The Silurian and Devonian rocks of one or other of 

 the Australian colonies have yielded four species of this genus, 

 so far as present researches have gone ; and to these we have 

 to add a fifth and sixth. 



* Foss. Corals of Michigan, p. 54, t. 22. figs. 1, 2. 



