BY R. ETHERIDGE^ JUNR.^ AKD JOHN MITCHELL. 675 



The outstanding features of this pygidium are its narrowness, 

 steep compressed high sides, narrow, prominent, posteriorly 

 strongly deflected axis, continuity of the axial rings, and the 

 absence of medial axial tubercles. 



Although this pygidium occurs associated with E. duntroon- 

 ensis, from its small width we are disinclined to consider it as 

 belonging to this species, neither are we disposed to give it a 

 specific name. 



Log. and Hor. — Same as E. dnntroonensis. 



c. — The other 'ype (Pl.lv., fig. 13 j referred to as occurring 

 with the above, is wider than long, almost equiangularly tri- 

 angular and steep-sided, finely granulate. Axis not prominent, 

 rather wide in front, contracting somewhat rapidly between the 

 first and third annulations, thence gradually, and terminating in 

 a fine point between the last pair of pleural annulations, ap- 

 parently a little short of the margin; annulations continuous, 

 some very fine; medial granules visible with the aid of a lens, 

 posteriorly very steeply depressed; axial grooves faint Pleurae 

 of twelve segments, granulate, and sharply deflected. 



This pygidium closely resembles the preceding, with which it 

 occurs, and only differs from it in the less prominent and ante- 

 riorly wider axis, greater width, distincter granulation of the 

 pleurte, and the apparently more rapid contraction of the axis 

 posteriorly. It is possible they are identical; and the differences 

 in the forms under notice arise from compression. The present 

 pygidium very closely resembles those from Gurnett's Farm, and 

 which we, for the time being, have placed with E. etheridgei. 

 Like the latter, it approaches the E. siehachi type of pygidium. 



Log. and Hor. — Same as E. duntroo7iensis. 



0?. — From a new locality, one of us collected in March, 1914, 

 a few fragments of trilobites among which, were specimens of a 

 free cheek and a tail referable to Encrinurus. The free cheek 

 (Pl.lvii., fig.O) belongs to the type in which the axial furrows 

 communicate with lateral cheek furrows outwardly and inwardly, 

 proceed obliquely downward along the inner and smaller cheek 

 lobes, passing out at the frontal passage of the facial sutures, and 



