22 CARBONIFEROUS TRILOBITES. 



5. Phillipsia Eichwaldi, Fischer, sp. 1825. PL IV, figs. 2, 4—11, 13, 14. 



AsAPHUS Eichwaldi, Fischer. MS. Geognostico-zool. per Ingriam Bait. Prov., 

 p. 54, tab. iv, fig. 4, 1825. (Published by 

 Eichwald.) 

 — — Fischer de Waldheim. Oryctog. du Grouv. deMo8cou,p. 121, 



pi. xii, figs. 1 and 2, 1830-37. 

 Otaeion Eichwaldi, Eichw. Bulletin Scient. de St.-Petersbourg, p. 4, " Die Thier. 

 &c., des Bergkalks im Nowogorod. Gouv., &e.," 1840. 

 Phillipsia c(elata, M'Coy. Synop. Carb. Foss. Ireland, p. 161, tab. iv, fig. 4, 1844. 



— - Morris. Cat. Brit. Foss., p. 114, 1854. 



Geiffithides meso-tubkeculatcs, M'Coy. Brit. Pal. Foss. Cambridge, p. 182, 



pi. 3d, figs. 10 and 11, 1855. 

 Phillipsia Eichwaldi, von Mdller. Trilob. der Steinkohlen. des Ural ; Bull. Soc. 



Imp. des Natur. de Moscou, part 1, p. 121, 



1867. 



— coelata, H. Woodw. Cat. Brit. Foss. Crust., p. 55, 1877. 



Eead-sliield circular, glabella slightly gibbous in front, but not overbanging 

 tbe fixed border whicb surrounds its anterior margin, and also forms a rounded 

 palpebral lobe over each eye ; basal lobes distinctly marked, rather triangular in 

 form, with two short lateral furrows on each side of the glabella at the back of the 

 eyes. The head is marked by two pores, one on each side of the raised glabella 

 just in front of the eyes (I discuss their nature later on) ;^ eyes rather large, and 

 somewhat strongly faceted, the facets being larger than in Ph. gemmuUfera ; neck- 

 lobe broad, marked by a single tubercle on centre, and by a row of fine granula- 

 tions or minute tubercles along its posterior border, like those on the axis of the 

 thorax, and separated on each side by a strong furrow ; raised free cheek, small, 

 but surrounded by a broad, flat margin, bevelled on the edge and striated on the 

 under rim, cheeks produced posteriorly into a long spine, which reaches even to 

 the ninth thoracic somite ; the entire head-shield, save the margin, is ornamented 

 by very fine granulations ; axis of thorax and abdomen very distinct, each ring 

 being marked by a row of very minute, spine-like granulations along its posterior 

 border ; ends of pleurae roundly terminated, rygidium composed of sixteen coa- 

 lesced somites, central axis ornamented like thoracic axis ; lateral lobes of pygidium 

 about eleven in number; margin smooth; border rounded, and striated with fine 

 parallel lines. 



Hijpostome. — The hypostome (figs. 4 and 7), which is finely striated, has an 

 oblong, median axis, slightly pointed at the extremity like a heraldic shield. Fig. 

 7 has lost its alge, but fig. 4 shows them to have been triangular in form. 

 ^ See Appendix to this Monograph at end of Part II. 



