32 



The size of the corallites would favour the view here 

 advanced, rather than a reference to Fnvosites. 

 Loc. — Zeehan, in a light coloured schistose rock. 



Trilobites. 



Genus Hausmannia, Hall Sf Clarke. 



(Pal. New York, 1888, VIL, pp. xxix. and xxxi.) 



Hausmannia meridianus, Etli. fil. ^" Mitchell. 



PI., Figs. 4 & G. 



H. meridianus, Eth. fil. & Mitchell, Proc. Linn. Soc. N.S.W., 1895, 



X (2), p. 504. 



Ohs. — A fragmentary pygidium of a large Hausmannia 

 occurs amongst the Heazlewood specimens. It corresponds 

 in all particulars, — large size, wide and very long axis, 

 and the greatly increased number of segments in the 

 latter, — to the N. S. Wales examples that Mr. John 

 Mitchell and the writer have distinguished by the name 

 of jneridianus. The tail apex is not preserved, so that the 

 peculiarities of this portion visible in Bowning specimens 

 need not be referred to. 



The size of the specimen is one and a quarter inches 

 long by one and three-quarters broad, and there are eleven 

 or twelve pleural segments more or less exposed to view. 

 The increase in the number of axial segments in the pygi- 

 dium over and above the normal of the typical Hausmannia 

 caudatus, Brlin., is not peculiar to the present form. 

 According to Salter^ the pygidium axis of Ti. caudatus 

 should possess 11-12 segments, but the late M. Barrande 

 mentions'-^ as many as 18-19 in H. Hausmamii. Numerous 

 instances of more than twelve could be cited ; for example, 

 the American Devonian H. ohioensis has seventeen axial 

 segments and a terminal appendage. 



Loc. — Heazlewood ; and Zeehan, in the Despatch Lime- 

 stone. 



Hausmannia, sp. ind. 



PI., Fig. 5. 



Ohs. — Several specimens of a possible second form exist 



as portions of pygidia, having the same general characters 



as the preceding species. In the best preserved example, 



howevei", there are but nine axial segments visible, all of 



' Mon. Brit. Trilobites, 1864. Pt. l,p. 49. 

 ^Syst. Sil. Boheme, 1852, I.J p. 538. 



