388 



Again, Mr. Foord figured the half of a thoracic segment pre- 

 cisely like those ascribed to the same genus, grooved pleurae 

 terminating distally in a short backwardly directed spine. 



Loc. — (1) Elvira River bed, south of base line Z, 27 

 (H. B. 27); (2) Ord River bed, five miles below the Elvire 

 Junction, opposite Hill J., 38 (H. B. 84). (43) 



Hot. — Salterella Limestone, Cambrian (Etheridge). 



I have before me a single poorly preserved specimen, 

 like and yet unlike R. forresti. The glabella and fixed 

 cheeks are the only portions of the cephalic shield clearly 

 distinguishable. The former is narrow and cylindrical, 

 decreasing in width forwards, with three continuous grooves. 

 The fixed cheeks are wider than in R. forresti, and the pal- 

 bebral lobes describe wider semicircles. The neck lobe is 

 prominent and large, with a small central granule just above 

 the posterior margin. There are five thoracic segments 

 attached, each apparently bearing a central granule, or per- 

 haps even a spine base, as that on the fifth axis is larger than 

 the others, and projects exactly as the broken base of a 

 spine would. The pleurae are short and, so far as the condi- 

 tion of preservation permits one to judge, of the Redlichia 

 type. The fifth is distally terminated (seen on right-hand 

 side) by a much longer, backwardly-directed acute r spine, 

 longer than in the corresponding part of either Redlichia 

 noetlingi or R. forresti . The precise relation of this fossil to 

 the lastnamed Trilobite is not at present clear; it may be 

 distinct, or, on the other hand, notwithstanding the trivial 

 differences pointed out above, possibly an advance in the 

 known structure of R. forresti. 



Loc. — Kelley Creek, Ord River Station (Miss E. Helms). 



Hor. — Salterella Limestone, Cambrian (Etheridge). 



Redlichia. thielei, Chapman. 



Ptycoparia thielei, Chapman: Proc. Roy. Soc. Vict., xxiii., 

 pt. ii., 1911, p. 316, pi. lviii., figs. 2, 3, 5, 7,' 10. 



Redlichia thielei, Walcott : Smithsonian Miscel. Collns., 64, 

 No. 1, 1914, p. 62. 



Obs. — By Mr. Walcott this species is referred to Red- 

 lichia,^) and is remarkable in the possession of four pairs of 

 glabella furrows. The presence of the long narrow glabella 

 reminds us of that of those termed Ptycoparia subsagittatu* 

 and P. tatei. 



(43) Glauert : Rec. W. Austr. Mus. and Art Gallery, i., pt. 2, 

 1912, p. 72. 



(44) Walcott: Smithsonian Miscel. Collns., 64, No. 1, 1914, 

 p. 62. 



