33 



which show traces of a tuberculation that has never been 

 seen on any of the N.S. Wales or Victorian specimens of 

 Hausmannia. The hmb in decorticated individuals is 

 exceedingly wide and slightly concave. The pleural seg- 

 ments also bore tubercles, and, from the presence of this 

 form of ornament, I am led to expect that the present 

 examples are distinct from those before referred to under 

 the name of H. meridianus. 



A similar tuberculated pygidium, as well as cephalic- 

 sliield exists in H. verrucosus, Hall,^ of the Niagara Group 

 of Indiana, U.S.A. 



Loc. — Zeehan, in the Despatch Limestone. 



* Genus Asaphus, Brongniart, 



(Crust. Foss., 1822, p. I7.) 

 Asaphus, sp. ind. 

 PI, Fig 2. 



Obs. — A single small pygidium, seen from the concave 

 interior, is, I think, referable to Asaphus. It is three- 

 quarters of an inch long, by nearly the same wide. The 

 pygidium appears to have been gently arched, with a 

 flattened border, a narrrow long axis extending to the limb 

 at the apex, and very faint traces of short coalesced pleural 

 segments. The specimen is sufficiently preserved to show 

 the presence of the genus in these rocks, and no more. As 

 compared with the pygidia in the Caroline Creek beds, it 

 is in the first place longer (i.e.. from before backwards) 

 than Asaphus, sp. a.-, but shorter than in sp. b., but is less 

 oval, and more angular in the centre of the posterior border 

 than either of them. Of the two, it is more nearly alhed 

 to sp. «., but I do not think identical with either. 



Loc. — Zeehan, in the Despatch Limestone. 



Genus Ill^nus, Dalmari. 



(Kongl. Vet. Acad. Handl., 1826, p. 248.) 



Illaenus Johnstoni, sp. nov. 



PL, Fig. 3. 



Obs. — Two specimens are in the collection, both shghtly 



pressed out of shape ; one is unquestionably a glabella, the 



other is more indefinite, and it is difficult to say whether 



» Indiana Geol. Survey Report, 1881 [1882], XI., p.n45, t.35, f. 7, 14-17. 

 3 Etheridge, Junr., Proc. R. Soc. Tas. for 1881 [1882], t. 1, 1. 6. 



