Br. H. Woodward — JVetv Carboniferous TriloUtes. 487 



2. Phillipsia Polleni, sp. nov. PI. XIV. Figs. 7-12. 



This species is considerably larger than the preceding one ; the 

 head is about one-third broader than long; the central portion of 

 the glabella is smooth, and rounded, gradually becoming narrower 

 towards the front and being broadest at the neck-furrow. The 

 facial suture runs in an undulating line between the glabella and 

 the genal portion (free-cheek) of the head. The eyes, as a rule, 

 are not well preserved, and in some specimens they might (as in the 

 preceding one) be supposed to be wholly absent ; but a careful study 

 of numerous specimens shows that this is due, not to their absence, 

 but to their imperfect state of preservation, the facets of the eye 

 being clearly seen in Figs. 9 and 11. This condition of the eyes, 

 due to compression, is also observable in the Trilobites from the 

 Culm of Devonshire (see Mon. Pal. Soc. Carb. Trilobites, 1884:, 

 pi. X. p. 66). The contour of the head-shield is senaicircular, the 

 posterior genal angles are slightly produced, forming a short spine 

 to each cheek (as seen in Figs. 8, 9, and 11). There are no furrows 

 visible on the glabella. The neck-lobe is well developed and is 

 broader than the free-segments which follow it; the pleural portion 

 is less distinctly marked. The free-segments of the cephalothorax are 

 nine in number ; the axis is very slightly raised, and is nearly one- 

 third broader anteriorly than the pleural portions, but diminishes 

 in breadth gradually towards the pygidium ; the extremities of the 

 pleurae are slightly pointed and recurved ; the pygidium is one- 

 third broader than long ; the border is slightly raised, the axis being 

 rounded off at some little distance short of the posterior border. 

 The number of coalesced segments observable in Figs. 9 and 12 is 

 about seven, but in Fig. 10 it apparently exceeds that number. 



Compared with Phillipsia Colei, from the Carboniferous of Ireland, 

 which is no doubt its nearest allied species (see Mon. Pal. Soc. 

 Carb. Trilobites, 1883, p. 16, pi. ii.), Ph. Polleni, differs from it in 

 the form of the glabella, and also in having the cheek-spines more 

 pronounced, and in the absence of furrows on the glabella. The 

 extremities of the pleura are rather more pointed in Ph. Colei. 

 In the pygidium the border of the shield is not so wide in Ph. 

 Polleni, and the axis is more rounded at the extremity and does 

 not reach so near to the outer edge of the border as it does in 

 Ph. Colei, in which the margin of the pygidium is also more cor- 

 rugated. Ph. Colei is the only Carboniferous species which closely 

 approximates to Ph. Polleni; but the differences just pointed out may 

 easily suffice to distinguish them from one another. I venture to 

 dedicate this form to the Kev. G. C. H. Pollen, S.J., of Stonyhurst 

 College, to whom I am indebted for my knowledge of these Trilo- 

 bites, and whose careful geological investigations brought about their 

 discovery. 



Both Trilobites belong to the Carboniferous Formation ; but as 

 to their exact geological horizon in the series it seems at present 

 most unwise to speak dogmatically, owing to the difficult nature 

 of the ground to be examined and the almost certainty of the 



