^80 SILURIAN TRILOBITES OF NEW SOUTH WALES, V. 



Fig. 13. — Left free cheek of the above showing prominent conical eye, 

 small inner lobe, and the inward trend of tlie axial groove reaching 

 about half-way along the inner cheek-lol)e. The posterior or out- 

 ward part bordered by the posterior suture is incomplete. Coll. 

 Mitchell. 



Encrinurus sp. U7idet. 



Fig. 12. — Not correctly represented. Coll. Mitchell. 



Plate Ivii. 

 Encrinurus ethkridgei, Mil. 

 Fig.]. — An ahnost complete specimen of a miture individual, showing 

 most of the specific featifres fairly well. Yarralumla. Coll. Aus- 

 tralian MuHeum. 

 Pig. 2. - Apygidium showing 12-13 pairs of pleural divisions. Yarralumla. 



Coll. Aunt. MuHeam. 

 Fig.4. — A smaller specimen. Yarralumla. Coll. A/itchell. 

 Fig.8. — Another pygidium, thirteen pleural segments, Yarralumla. Coll. 

 Aust. Museum. 



Encrinurus silverdai.ensis, E. db M. 

 Fig. 3. — Axis and right pleural lobe of a large pygidium showing seven 

 large tube^'cles and several smaller ones on the central area of the 

 axis, and twelve pleural segments. 



Encrinurus rothwell.*:, E. db M. 

 Fig.5. — A nearly complete specimen, showing the characteristic features 

 fairly distinctlJ^ Bowning. Coll. Mitchell. 

 Encrinurus sp. undet. 

 Fig. 6. — A right free cheek. Tarlo River. Coll. Mitchell. 

 Fig, 7. — Portion of a pygidium. 'farlo River. Coll. Mitchell. 



Encrinurus .mitchkllt, Foerste. 

 Fig. 9. — A left free cheek, to show that the axial furrow does not traverse 

 inwardly along the smaller lobs of the cheek. Bowning, Coll. 

 Mitchell. 



Emcrinurus silvkrdalensis. 

 Fig. 10. — A right free cheek, to show the passage of the axial groove in- 

 wardly along the small lobe of the cheek, and passing out at the 

 junction of the facial sutures in front of the glabella. Silverdale. 

 Coll. Mitchell. 



Encrinurus bowningensis. 

 Fig. 11. — A right free cheek, showing the passage of the axial groove 

 inwardly along the smaller lobe of the cheek, as is the case in E. 

 Silver dalewiis. Slightly eularged- 



[Photosby H.B. and J.lM.] 



