448 CARBONIFEROUS TRILOBlTfiS Of AUSTRALIA, 



thickened. Eyes prominent, large, crescentic and faceted. 

 Genal angles rounded. Hypostome alate, shield like, and striated 

 in tiie fashion common to Phillipsise. 



Thoi'dx 11 mm. wide and 9 mm. long, appearing to have been 

 finely granulated, with a few scattered tubercles; straight-sided. 

 Axis very strongly and acutely arched, rings, centrally and 

 basally, strongh^ inclined anteriorly, each one bearing along the 

 medial line a rath--r prominent tubercle, giving the axis through- 

 out a serrated character: spread equal to that of one side-lobe, 

 mildly tuberculate, height and width diminishing gradualh* pos- 

 teriorly, axial grooves faint. Pleurae gently rising from the 

 axial grooves to the fulcra, thence steeply deflected, mesial fur- 

 rows of the somites shallow and wide, and reaching the extremi- 

 ties, which are rounded: along the fulcral line each rib bears a 

 tubercle on the posterior ridge, and there is evidence of the 

 presence of general fine tuberculation or granulation. 



Pygidium semielliptic, length 8 mm., width 10 mm. Axis 

 very prominent, the first ring having a medial forward trend, 

 rings eight or nine, counting the end-piece, which is buttress- 

 like, and ends at the border in a rather fine point, and bears a 

 subconspicuous tubercle. Pleuriie with seven divisions, all rather 

 inconspicuous in the specimen (decorticated) serving for this de- 

 scription, moderately convex; mesial furrows very shallow and 

 reaching to the faint furrow within the border, each segment 

 bearing a tubercle at the fulcral angle, and showing traces of 

 other tuberculation, as do also the axial rings; the border is 

 relatively wide, steep, gently thickened, and bounded inwardly 

 by a faint furrow, and is crossed only by the first pair of ribs. 



(9^^^ —Though the glabellar furrows and lobes are not visible 

 in the specimen described, the shape of the glabella and character 

 of the hypostome leave no doubt as to its being a Phillipsia, and 

 the specimen is one of the finest of this genus yet discovered in 

 Australia. It difiers so widely from other Australian species 

 that there is no need to detail its relationship. It bears no close 

 relationship to any of the American Phillipsiai referi-ed to in 

 Brigadier General A. W. Vogdes' Monograph.* 



* " The Genera and Species of North American Carb. Trilobites,"' 

 Amialb N. Y. Acad. Sci., 1888, vi. 



