320 THE SILURIAN TRILOBITES OF NEW SOUTH WALES. 



Proteus Rattei, Eth^fl., and Mitchell (continued). 



Fig. 2a. — Cephalic shield and portion of thorax, the lateral portions of the 



former rather displayed, x 2. 

 Fig. 26. — Remarkably small head of a young individual, x 5. 

 Fig. 2c. — Pygidium showing the surface sculpture and acicular termination 



to the thoracic axis, x 2. 

 Fig. 2d. — Larval form, x 5. 



Proetus australis, Eth.,fil.> and Mitchell. 

 Fig. 3. — A more or less perfect individual. 

 Fig. 3a. — Portion of a cephalic shield. 

 Fig. 3&. — A somewhat more perfect specimen than fig. 3, showing the long 



genal spines embracing the whole of the thorax, x 2. 

 Fig. 3c. — A glabella showing small basal furrows, x 2. 

 Fig. 3d. — A free cheek. 

 Fig. 3e. — Another free cheek, x 2. 



