674 SILURIAN TRILOBITES OF NEAV SOUTH WALES, V., 



segments, sloping very steeply from the axis, only the first pair 

 strongly geniculate; axial grooves faint. 



The triangular outline is close to that of E. rothwellce, but the 

 very prominent axis and smaller number of pleural annulations 

 in the latter clearly separate it from this form. In contour, it 

 approaches the pygidium of E. siebachi ; but most of all it 

 resembles our E. etheridgei in the nontestaceous condition, and 

 until we obtain further evidence and material, we are unable to 

 determine the species with certainty. The fragmentary cephala 

 already described as agreeing in specific features with that of E. 

 etheridgei, which were found associated with these pygidia, and 

 the occurrence of free cheeks, which at present appear to us to 

 be practically identical with those of E. etheridgei, also in associ- 

 ation, still further incline us to the belief that their specific 

 identity is the same. If, however, a testaceous specimen of the 

 pygidium of E. etheridgei be discovered later on, and be found 

 in that state not to have the axial rings wholly continuous, we 

 would then be disposed to give this fossil specific rank under the 

 name of E. loomesi, as a mark of gratitude for assistance received 

 by one of us from Mr. F. Loomes, of Bowning, in the collection 

 of specimens. 



Loc. and //or. ^Gurnett's Farm, three miles west of Bowning 

 township. Parish Bowning, County Harden. Lower Trilobite 

 BedsC?), Bowning Series (Hume Beds, etc.). Upper Silurian =^ 

 ('?)Wenlock. (Coll. Mitchell). 



b. — From Duntroon, several pygidia (PI. 1 v., fig. 14) have been 

 collected, associated with E. duntroonensis, nobis. They pro- 

 bably include two types. Of the first, the specific characters 

 are — Acutely triangular, length greater than width (4 : 3 ap- 

 proximately), very faintly or microscopically granulate, droops 

 intensely posteriorly. Axis very narrow and prominent, taper- 

 ing gradually and ending in a fine point between the last pair 

 of pleural segments ; annulations continuous and numerous ; 

 medial tubercles not apparent; axial grooves faint. Pleurae with 

 twelve pairs of annulations at least, sloping very steeply from 

 the axial grooves, having generally a compressed aspect. 



