482 CARBONIFEROUS TRILOBITES OF AUSTRALIA, 



Tn the possession of ten or more segments in the thorax, it 

 resembles G. sweeti Eth. fil., and, certainly, in this respect, is 

 not a normal Grijfithides or Phillipsia. This peculiarity, too, 

 very decidedly separates it from P. stam'ellensis mihi {P. dnhia 

 Eth. .fil.). 



Family PROETID^. 

 Genus B r a c h y m e t o P u s McCoy, 1 847. 



Ann. Macr. Xat. Hist., xx., p 229, PI. xii., figs. la, \h. 



McCoy's description of the genus is as follows : — ^'•Gen. Clear. 

 Cephalothorax truncato-orbicular: limb narrow, produced back- 

 wards into flattened spines: glabella smooth, cylindrical or ovate, 

 about twice as long as wide, not reaching within about its own 

 diameter of the front margin: one pair of small, basal, cephalo- 

 thoracic lobes, or none. Eyes reniform, in the midst of the 

 cheeks (1 smooth); eye lines unknown. Surface strongly gran" 

 ulated: one tubercle on each side of the anterior end of the 

 glabella, the marginal row and a circle round each eye being 

 larger than the rest. Body-segments unknown. Pygidium 

 nearly resembling the cephalothorax in size and form, rather 

 more pointed, strongly trilobed, and with a thickened prominent 

 margin; axal lobe about as wide as the lateral lobes, of about 

 seventeen narrow segments ; lateral segments about seven, 

 divided from their origin, each terminating in a large tubercle 

 at the margin.'" Genotype, Br. slrzehckii. 



In this description, characters are included which are merely 

 specific. H. Woodward* supplies the following amended de- 

 scription of the genus : — " General form elliptical: headshield 

 semicircular and slightly pointed, about one-third wider than 

 long; glabella small, somewhat elevated, one-third the width of the 

 entire shield and about one-half the length, having a basal lobe 

 on each side, but no short lateral furrows on the glabella: neck- 

 furrow distinctly marked, equal in width to the posterior border 

 of the free cheeks: eyes small, smooth, equal to half the length 

 of the glabella; no facial sutures visible, only the axal furrow 

 surrounding the glabella and the neck-furrow; free cheeks slightly 



^ Mom, Brit, C^^rb, Tnlobites, 1883-4, pp. 46-7. 



