BY JOHN MITCHELL 453 



the latter. 3. In the Queensland one, the pleural segments 

 along the ridges are separated by very distinct sutures; in the 

 other, this is not so, 4. In the Queensland one, the border is 

 not nearly continuous, for the three anterior pairs of pleural 

 segments reach to the edge of the lobes, and these are the only 

 ones which are perfect on the portion of the left and pleural lobe 

 of the specimen. 5. The mesial furrows and ridges of the pleural 

 segments are not alike in the two. 6. In the Queensland tail, 

 there were not less than sixteen or more axial rings, but fourteen 

 only in that of the other. 7. The axial grooves are deeper in 

 the specimen from Queensland, than in the one from New South 

 Wales. The two agree in the character of their granulations; 

 but that of the Queensland one is the coarser. 



That the Queensland pygidial fragment represents a new 

 species of either Phillipsia or Griffithides. there is no doubt; 

 and, to it, my proposition is to apply the name Phillipsia grandis, 

 first suggested for it by my friend, Mr. Etheridge. 



P.i'ohnsia differs from all species of this genus, or of Griffith- 

 ides known to me. Mr. Etheridge, too, noted (loc. cit.) how 

 different it was from foreign Carboniferous trilobites. 



Loc. and Hor. — Swain's Conditional Purchase, seven miles 

 south-east of Carroll, County Buckland (D. A. Porter). Car-, 

 boniferous. 



Phillipsia(?) stroui>e;nsis, sp.nov. 

 (Plate xlvi., fig.14; Plate li., fig.ll), 



Sp. Chars.-^Cephalon and thorax unknown. 



Pygidium semielliptic, densely and finely granulate, moder- 

 ately convex; greatest width 17 mm., length 15 mm. Axis only 

 moderately convex. Consists of twenty annulations, a few of 

 the anterior of which have a very gentle forward inclination, 

 centrally and basally ; contraction posteriorly very gradual, 

 terminating bluntly, and rounded at the border, with half the 

 anterior width (3 mm.), medial furrows of the rings wide and 

 shallow; anchylosing ridges not very prominent, but distinctly 

 granulated, anterior spread slightly less than that of one side- 

 lobe. Axial furrows faint. Pleurae moderately convex, seg- 

 ments fifteen, the last faint, anterior pair faceted, all finely and 



34 



