BY JOHN MITCHELL. 451 



Philltpsia proxima, sp.nov. 

 (Plate xlvi., figs.lf), 16). 



Sp. Chars. — Pygidinm semielliptical, fairly convex, practically 

 smooth, so fine is the granulation. Length 12 mm., width 15 

 mm. Axis strongly convex, rings twenty, tapering posteriorly 

 very gradually, and ending bluntly at the border, with a spread 

 of about half that of the anterior ring; axial furrow shallow, but 

 distinct. Pleurje gently convex, consisting of twelve pairs of 

 ribs, the last one or two very shoit and faint, all terminating at 

 the border, which is continuous to the articulating face and sub- 

 depressed: medial furrows of the segments, except in the cases 

 of a few of the posterior pairs, well defined, anchylosing ridges 

 also fairly prominent; furrow separating border and pleural ribs 

 distinct. 



Ohs. — This p3"gidium agrees with that of PhiUipsia eiehivaldi 

 Fischer, in the continuous smooth and somewhat depressed 

 border, and the character of the pleural segments. The most 

 important differences between them are— (1) the pygidium of 

 F. eichivaldi is just as wide as long, is distinctly granulated, and 

 the distal axial end does not seem to be prominent. The 

 pygidium above-described has a length only four-fifths of its 

 width, and is practically smooth. The total length of the pygidia 

 of mature individuals of the former, as shown by the beautiful 

 figures in Dr. H. Woodward's work* is 9-5 mm., that of the 

 latter is 12 mm. The large number of rings in the axis of ours 

 places it far apart from the other. Named because of its close 

 resemblance to P. eichivaldi Fischer, in shape. 



Loc. and H or. — Glen William Road, near Clarencetown, Parish 

 Parr, County Durham. Lower Carboniferous. 



Phillipsia('?) robusta, sp.nov. 

 (Plate xlvii., figs.l and 8). 

 Phillipsia graridis Eth. fil., Mem. Geol. Surv. N. S. Wales, No. 

 5, Pt. ii., 1892, p.l28, text-fig.5 {non PI. xxi., fig.5). 

 Sp. Chars. — Cephaloji and thorax unknown. 

 Pygidium subsemicircular, strongly convex, very finely granu- 



* Mon. Brit. Carb. Trilobites, 1883-4, PI. iv., figs. 9 and 1.3. 



