BY R. ETHERIDGE, JUXR., AND JOHN MITCHELL. 509 



In Victoria it is found in the olive miiclstones of Broadhurst's 

 Creek, near Kilmore, and in the arenaceous beds of Yerring, 

 Upper Yarra. 



In Tasmania the species occurs in the Despatch Limestone of 

 Zeehan and Heazlewood, N.W. Tasmania. 



EXPLANATION OF PLATES. 



Plate XXXVIII. 



Hausmannia meridianus, E. and M. 

 -An almoat entire specimen; Bowning. Coll. Mitchell. 

 -Pygidium showing the increased number of segments, absence of 



test on the limb, and the acicular spine; Bowning. Coll. Mining 



and Geol. Museum. 

 -Pygidium of a young individual with a well-developed acicular 



spine; Bowning. Coll. Ibid. 

 -Glabella, portion of fixed cheeks, and one eye. Frontal lobe 



elliptical and strong eye lobes; Bowning. Coll. Mitchell, 

 -Portion of cephalic shield showing the right facial suture and 



form of the eye lobe ; BoAvning. Coll. Mitchell. 

 -An eye and palpebral lobe, x 3. Coll. Mitchell. 

 -Free cheek showing course of posterior portion of left facial 



suture, and the genal spine; Bowning. Coll. Mitchell. 

 Fig. 8. — Hypostome. Coll. Mitchell. 



Phacops Sweeti, E. and M. 



Fig. 9.— Partially rolled specimen, with thorax and pygidium; Mansfield 

 District, Vict. Coll. Sweet. 



Plate XXXIX. 



Phacops Sweeti, E. and M. 



I'ig- 1- — Cephalic shield somewhat distorted by pressure, but with the left 

 eye intact; Mansfield District, Vict. Coll. Sweet. 



Fig- 2. — Decorticated cephalic shield showing the quadrate contour of the 

 cephalic shield, small basal lobes, intercalary nodules, neck 

 ring, and eyes; Mansfield District, Vict. Coll. Siveet. 



