two Species of AXwQoWiQSi and one o/"Amplexopora. 177 



though these were studied more effectively by means of micro- 

 scopic sections. One of the specimens has the surface (of 

 which only a very small portion is preserved) studded with 

 small conical elevations, about 1 centim. apart measured from 

 their summits. Of the significance of these we are unable to 

 form an opinion. We do not know of their occurrence in any 

 other species of Alveolites. 



Three species of Alveolites have been recorded from the 

 Devonian rocks of Australia. Of these, one only {A Iveolites 

 suhcequalis, Edwards & Haime) need be compared with the 

 present form, and the much smaller corallites of the latter 

 afford sufficient grounds for their separation. 



In his ' Rech. sur les Foss. Pal. de la Nouv. Galles du 

 Sud,' M. de Koninck instituted a genus, under the name of 

 Billingsiaj for a Devonian coral from the neighbourhood of 

 Yass, New South Wales, which the author describes as appa- 

 rently devoid of tabulas (" Les planchers semblent faire 

 d^faut ") and as possessing lateral openings in the walls of 

 the corallites resembling those of Syringopora^ except that in 

 Billingsia the walls are closely united, and not separated from 

 one another as they are in Syringopora. We are of opinion 

 that M. de Koninck has entirely misunderstood the structure 

 of this coral. The figures given by that author (see pi. ii. of 

 the work above cited) accord remarkably well with our form ; 

 and although he states in his description that tabula? are 

 wanting, they appear to be shown clearly enough in fig. 4 

 of his work, which we reproduce (fig. X^d). 



Assuming, then, that the Billingsia alveolaris is identical 

 with the Queensland specimens, we are of course unable to 

 accept M. de Koninck's suggestion that the present species 

 is transitional between Aidopora and Syringopora. 



Locality and Horizon. Regan's allotment, Northern railway, 

 31 miles from Townsville, North Queensland. Devonian. 



Collection. Geological Survey of North Queensland, Towns- 

 ville, N. Q. 



Alveolites alveolaris, var. queenslandensis^ Eth. & Foord. 

 (PI. VI. figs. 2-2 h.) 



This form differs from the one described above chiefly in 

 the size of the corallites, which are considerably larger than 

 those of A. alveolaris. The present form appears to be 

 branching and lobulate, and occurs in large weathered and 

 rounded fragments, one of which measures about 12 centim. in 

 its greatest length, and about 6 centim. in thickness, but 

 the specimen must have been considerably larger when 

 perfect. Scarcely any of its surface remains, and microscopic 



