393 



here we are faced by the negative fact that no Asaphiscus- 

 like cephalons have so far Been discovered at Caroline Creek, 

 that is to my knowledge. 



In the Florentine Valley extension there also occur very 

 similar isolated pygidia that I referred to NiobeA 50 ^ In these 

 tails, varying from semicircular (correct outline) to deltoid- 

 triangular (distorted outline), are long, narrow, segmented 

 axes, with indistinct traces of pleural subdivision on the 

 lateral lobes. The limbs, as in those of the Caroline Creek 

 specimens, are broad and continuous. In all probability, to 

 whatever genus these latter pygidia may in the future be 

 relegated, those occurring in the Florentine Valley will follow 

 suit. 



DESCRIPTION OF PLATES. 



Plate XXXIX. 



Olenellus (? ), sp., or Ptychoparia(?), sp. 

 Fig. 1. Fragmentary cephalon (figured in Trans. Roy. Soc. 

 S. Austr., xxix., pi. xxv., fig. 1). x2 diam. 



Ptychoparia (? ) tatei, H. Woodward, sp. 



Fig. 2. Imperfect cephalon, from a replica of Woodward's 

 original specimen of Dolichometopus tatei (figured in the Geol. 

 Magazine, i., 1884, pi. xi., fig. 3). x8 diam. 



Fig. 3. Imperfect cephalon, from one of Tate's original 

 specimens of Olenellus pritchardi (figured in Trans. Roy. Soc. S. 

 Austr., xv., pt. 2, 1892, pi. ii., fig. 11). x4 diam. 

 Ptychoparia (? ) subsagittatus, Tate, sp. 



Fig. 4. Imperfect cephalon, from one of Tate's original 

 specimens of Microdiscus subsagittatus (figured in Trans. Roy. 

 Soc. S. Austr., xv., pt. 2, 1892, pi. ii., fig. 12). x6 diam. 



Fig. 5. Another similar example of Tate's, but not pre- 

 viously figured. The glabella furrows are distinctly visible in this 

 specimen. x6 diam. 



Ptychoparia (? ) australis, H. Woodward, sp. 



Fig. 6. Imperfect cephalon, from a replica of Woodward's 

 original specimen of ConocephaUtes australis (figured in the Geol- 

 Magazine, i., 1884, pi. xi., figs. 2a, b). Nat, 



Plate XL. 



Ptychopariai?) howchini, Eth. fil. 

 Fig. 7. Greater portion of a cephalic shield, from the 

 original specimen (figured in Trans. Roy. Soc. S. Austr., xxii., 

 1888, pi. iv.). x2 diam. 



Ptychoparia alroiensis, Eth. fil. 

 Fig. 8. Nearly complete Trilobite, from a replica of the 

 original specimen (figured in the Northern Territory Bulletin, 

 1910, pis. ii. and iii.). x4 diam. 



The illustrations were obligingly prepared for the writer by 

 Mr. J. R. Kinghorn, of the Australian Museum, Sydney. 



(50) Etheridge : Rec. Austr. Mus., v., No. 2, 1904, p. 26, 

 pi. x., figs. 1-3. 



