142 
THE SILURIAN TRILOBITE LICHAS AUSTRALIS 
much shorter than that of Barrande’s species, the central lobe 
is longer in proportion and is not produced into a median rib ; 
the pleural ribs are not flat and wide but rounded and high ; 
and the spines in which they terminate are stouter. L. haueri 
has no ridges between the lateral ribs. 
Horizon. — ^Yeringian (Upper Silurian or Siluro-Devonian). 
Localities. — ^Junction of Woori Yallock Creek and Yarra River; Syme’s 
Tunnel, Killara; Syme’s Quarry, Killara; Syme’s Homestead, Killara; 
Warburton Road, Killara (a little east of turn-off to Killara Railway 
Station). All these localities are proximate to one another. Apropos of 
the last-named locality, it is worthy of note that in 1913 Dr. J. S. Green 
presented a complete but distorted trilobite collected at this place to the 
Museum. It was at that time determined as Odontopleura sp., and was later 
recorded as such (2) , but it must now be referred to L. australis. A pygidium 
of L. australis has been collected from the same locality, the published 
reference to which is “between Killara and Woori Yallock’’ (2). 
Associates. — The following trilobites are associated with Lichas australis : 
Calymene hlumenhachi (Brongniart), Cheirurus sternbergi (Boeck), 
Cyphaspis sp., Dalmanites meridianus (Etheridge and Mitchell), Odonto- 
pleura jenkinsi Eth. and Mitch., O. rattei Eth. and Mitch., Phacops crosslei 
Eth. and Mitch., P. fecundus McCoy non Barrande, P. latigenalis Eth. and 
Mitch., P. serratus Foerste. 
The writer wishes to thank Mr. L. S. G. Butler for the 
photograph of the trilobite described. 
References 
1. Barrande, J. “Systeme Silurien du Centre de la Boheme.’’ Praguer, 
Paris, 1852. 
2. Gill, E. D. Yeringian Trilobites, Viet. Nat., Vol. LIV, Feb., 1938, 
pp. 167-71, 4 figs. 
3. McCoy, F. Prodromus of the Palaeontology of Victoria, Decade III, 
p. 18, pi. 12, fig. 11. Geol. Surv. Viet., 1876. 
Description of Plate V 
1. Lichas australis McCoy, X4 approx. Complete carapace from Syme’s 
Quarry, Killara. Reg. No. 14,087. 
2. L. australis. Cephalon showing eye pedicel from Syme’s Tunnel, 
Killara; magnified. Reg. No. 14,088. 
