386 



iixed cheeks gently convex, in the same plane as the glabella, 

 separated from the anterior margin or fillet, which is cord- 

 like and prominent, by a shallow groove; neck-ring in its 

 median portion comparatively thick, its groove well defined. 

 Facial sutures in front of the palpebral lobes almost longi- 

 tudinally straight, really very slightly convex, posterior to 

 them curving downwards with a concave sweep and sharply 

 outwards in the direction of the srenal angles. 



Thoracic somites fourteen' 59 ^ ; axis elongately and nar- 

 rowly obconical, gently convex; axial grooves wide and open. 

 Pleurae arched, angular in the middle line, each strongly 

 grooved or furrowed, the proximal half horizontally so, the 

 distal obliquely bent. Pygidium small, of two (or perhaps 

 three) coalesced segments, and a small terminal appendage: 

 those of the pleurae deflected backwards to a slight degree : 

 posterior margin truncate and nearly straight. 



Obs. — I am indebted to both the Federal Director of 

 Klines at Darwin and Corporal A. L. Merrotsy, 13th Field 

 Company, Australian Engineers, for replicas of this Trilo- 

 bite, from which the foregoing description was drawn up. 

 I believe this to be the most complete Cambrian form yet 

 found in Australia, and a very compact little body it is. 



There appears to be, judging by Mr. C, D. Walcott's 

 numerous figures, considerable latitude in the number of 

 glabella furrows and tail segments in Pti/choparia ; in the 

 former from none to three (the last predominating), and in 

 the latter from four to seven (again the last typical). In the 

 present instance the facial sutures and number of thoracic 

 segments are in order, but in the possession of only two pairs 

 of glabella furrows, and a decreased series of pygidical seg- 

 ments, it is not in accord with strict precedent. 



Loc. — Eight miles east of Alroy Downs, Barkly Table- 

 land, Northern Territory (Merrotsy). 



Hor. — Cambrian (Etheridge). 



Genus Redlichia, Cossmann, 1902. 



Hoeferia, Redlich: Cam. Fauna E. Salt Range (Pal. India, 

 n.s., i., pt. 1, 1899), p. 2. 



Redlichia, Cossmann: Revue Crit. Pal., 6th Ann., No. 1, 1902, 

 p. 52. 



Redlichia, Waleott : Proc. U.S. Nat. Mus., xxix., 1905, p. 24. 

 Obs. — Described by Dr. Redlich as a Trilobite with a 

 semicircular cephalon, and free cheeks armed with genal 

 spines ; a cylindrical glabella provided with four pairs of fur- 

 rows, and palpebral lobes which surround the glabella in 



(39) The first thoracic segment is not shown in the figure; it 

 is more or less tucked under the neck ring. 



