BY JOHN MITCHELL, 489 



liowever, is too fragmentary to describe and figure. The occur- 

 rence of three pygidia in a launch indicates that they may be 

 plentiful, and careful search may bring better specimens to light. 



KXI^LANATION OF PLATES XLVI.-LIII. 



Plate xlvi. 

 PliWiima colfinsi Mitchell. 

 I^'ig.s. 1, 2, o, 4. .">. — Fin. 1 i« a photo ( x S) made froni the specimen repre- 

 sented in Fig.'i. The glabellar features are plainly visible. Figs. 

 .'i, 4, T) represent pygidia. and shoM" their characteristic featui-es 

 very well. Figs.4 and "> x | (about). (Coll. Mitchell). 

 PhUlipsia coulteri Mitchell. 

 Figs. (). 7, S. *•. 10. — Different views of one individual. Fig.H x 4, and Fig. 

 10 nearly natural size. In Figs. 8 and 9, the mild dorsal serration is 

 visil)le. In Fig. 10. the hypostome is plaiidj^ seen, and the latlier 

 large tubercle of the terminal axial ring. (Coll. Mitchell). 

 PJi///ip-^ia hftricejjs Mitchell, 

 Figs.ll. 12.— Cephalon and tail (Colh Mitchell). 



Grijfit hides conrexicaiidatus Mitchell. 

 Fig. 18.— Dorsal view. (Coll. Mitchell). 



PJii//ip)<ia xfroHdeii.-!(s Mitchell. 

 Fig. 14. — The specific features clearly represented; ( x :]). (Coll. Mitchell). 



Phillipxiu proxlnm ^litchell. 

 Figs. IT), 16. — ^Two views of a pygidium, the lattci' alxjut naUnal size. 

 (Coll. Mitchell). 



Plate xlvii. 

 PhiUipuKt rohnsta Mitcliell. 

 l''ig. 1. — The pygidium originally described l)y Mi'. W. Flhcridge. Junr..as 

 /'. <irandi-<. II shows the important features rather clearly-. (Coll. 

 < Geological and Mining Museum, Dept. of Mines, Sydney. No. 14'.»2). 

 Pl,llli)>s;n (iruiidi.s Ftli. Hi. 

 l''ig.2. — Piioto of the specimen originally descrihetl hy Mr.' H. Flhcridge. 

 Junr. , and for which the specific nam3 r/y-rt/Af//.*.- was first suggested 

 by him. The figure shows how different in character arc the pleural 

 ribs from those of P. rohiisfa; the sutures along the aitit-ulatijig 

 ridges, and the crossing of the border by the anterinr ril»s. (Coll. 

 Geological and Mining Museum, Dept. of Mines, Sydney. Xo.l.lKO). 

 PhiUij,xi<i cloiKjald Mitchell. 

 Figs. 8, 4. — ^Casts from an almost perfect mould (jr cover. They exhil)it 

 clearly the features of this fine trilobite. [Coll. (reological and 

 Mining Museum, Dept. of Mines, Sydney. No. I.IOO, (cover)]. 



