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).(^? 
Hor.—Salterella Limestone, Cambrian (Etheridge). 
I have before me a single poorly preserved specimen, 
like and. yet unlike A. forresti. The glabella and fixed 
ecreasing 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 1s 
prominent and large, with a small central granule just above 
the posterior margin. There are five thoracic segmen 
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 Redlicha 
type. The fifth is distally terminated (seen on right-hand 
side) by a much longer, backwardly-directed acuter 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 | 
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. hs 
Ptycoparia thielei, Chapman: Proc. Roy. Soc. Vict., XXIV., 
pt. ii, 1911, p. 316, pl. lviii., figs. 2, 3, 5, 7, 10. 
. Redlichia thielei, Walcott: Smithsonian Miscel. Collns., 64, 
No. 1, 1914, p. 62. 
Ob Mr. Walcott this species is referred to Red- 
lichia, ^9 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 subsagittatus 
and P. tatei. 
1912, p. met Rec. W. Austr, Mus. and Art Gallery, i., pt- 2» 
~ se Walcott: Smithsonian Miscel. Collns., 64, No. 1, 1914 
