466 CARBONIPKROUS TRILOBITES OF AUSTRALIA, 



Oriffithidea seminiferus vslv. ausiralasica Eth. fil., (in part) op. 

 cit., p.216. 



(PL xlvii., fig.9; PI. xlix., figs. 1-8, 13-14; PI. 1., 6gs.lO-ll; PI. li., 

 figs.12-14; PI. lii., fig.l; PI. liii., figs.8-9). 



Here is Mr. Etheridge's description of this species (loc. cit.): — 

 "/S/>. Char. Glabella round, without any lateral inflection of the 

 margin, moderately convex in the middle line, and a little arched 

 posteriorly; neck furrow strong and deep, with more or less com- 

 plete basal furrows; anterior furrows present, but faint; anterior 

 border thick and upwardly turned, leaving a wide depression 

 between it and the front of the glabella." 



In his observations, Mr. Etheridge remarks: — "The pygidium 

 referred to is much larger than that described as P. dubia, but 

 otherwise resembles it." In the text, there is nothing to show 

 what pygidium is here referred to, for no description of it is 

 given; but no doubt he refers to the pygidium illustrated in 

 Plate xliv., fig. 6; and if so, the determination, in my opinion, is 

 incorrect. This pygidium belongs to the trilobite described by 

 me as Phillipsia rockhamptonensis, and is shown in PI. 1., fig.8. 



The following is a more amplified description of the type- 

 cephalon of the species. Outline subsemicircular, surface gran- 

 ulated. Glabella wider across the basal lobes than it is long, 

 very convex both transversely and longitudinally, the front lobe 

 (the portion anterior to the anterior pair of the lateral furrows) 

 semicircular, highest between the mesial pair of lateral furrows. 

 Three pairs of lateral furrows present, anterior and mesial rela- 

 tively wide, shallow and straight, basal pair wide and deep; 

 anterior and mesial lobes narrow, basal pair large, subfusiform, 

 much lower than the glabellar centre, overhanging the axial and 

 neck-furrows; limb very large, border strongly thickened and 

 upturned, furrow wide and deep. Neck-furrow deep; neck-ring 

 strong, convex, sharply curving anteriorly, as it approaches the 

 axial furrows; sides gradually thickening towards their origin. 

 Frontal limb very wide, border strongly thickened and upturned, 

 and separated from the glabella by a wide and pronounced 

 furrow, strongly expanded antero-laterally. Facial sutures 

 anteriorly directed outwards at an angle of about 25°. Fixed 



