Carboniferous Limestone Trilobites. 485 
specimen; but his figure, if such is the case, does not assist us in 
recognizing it with absolute certainty. 
GRIFFITHIDES OBSOLETUS, Phillips, sp., 1836. 
Asaphus obsoletus, Phillips. 1836. Geol. Yorks, vol. ii. p. 239, pl. xxii. figs. 3-6. 
granuliferus, Phillips. 1886. op. cit. fig. 7. 
Philiipsia Brongniarti, De Koninck. 1842. Anim. Foss. t. lil. fig. 7. 
Morris. 1854. Cat. Brit. Foss. p. 114. 
——_—___ —___. Salter and H. Woodw. 1865. Cat. and Chart. Foss. Crust: 
; p. 16, fig. 113. 
H. Woodw. 1877. Cat. Brit. Foss. Crust. p. 55. 
Griffithides obsoletus, H. Woodw. 1883. Pal. Soc. Mon. Carb. Trilob. Part 1. p. 35, 
pl. vi. fig. 12. 
This species is founded on a very broad and smooth pygidium, 
nearly one-fourth broader than long, composed of ten coalesced 
somites, the axis much broader than the pleural portion, each of 
the nine rib-like plicee being marked by a furrow down the centre 
(as in the pygidium of G. globiceps already noticed), the margin 
of the tail-shield is smooth. 
The glabellal portion of the head, most probably belonging to the 
same individual (being enclosed in the same piece of matrix), al- 
though mutilated, exhibits peculiar and delicate striations over its 
entire surface. The head (somewhat restored) is figured by Prof. 
Phillips with the pygidium. ‘This specimen is the type of Phillips’s 
figure in the Geol. of Yorkshire, and was at that time in the Gilbert- 
son Collection, and now in the British Museum (Natural History). 
Formation.—Carboniferous Limestone. 
Locality.—Bolland, Yorkshire. : 
Specimens of Griffithides obsoletus have been examined in the 
National Collection and from the Woodwardian Museum, Cambridge. 
se ee 
GRIFFITHIDES LONGISPINUS, Portlock, 1843. Pl. XII. Fig. 5. 
Griffithides longispinus, Portlock. 1848. Geol. Rept. Lond. p. 312, pl. xxiv. 
fi 
——_ ———_—_—_— 
g. 12. 
M’Coy. 1844. Carb. Foss. Irel. p. 161. 
—— —— longiceps, Morris. 1854. Cat. Brit. Foss. p. 109. 
Salter and H. Woodw. 1865. Cat. and Chart. Brit. Foss. 
Crust. p. 16, fig. 115. 
Phillipsia —— V. von Moller. 1867. Trilob. der Steinkohl. pp. 19 and 73. 
Griffithides —— H. Woodw. 1877. Cat. Brit Foss. Crust. p. 37. 
longispinus, H. Woodw. 1883, Pal. Soc. Mon. Carb. Trilob. p. 36. 
General form elongated-oval; head wider than long; glabella 
very gibbous in front, slightly overhanging the anterior border, 
much broader in front than behind the eyes, basal lobes small, 
rounded ; neck-lobe strongly arched, narrow, divided from the 
glabella by a deep neck-furrow; fixed cheeks narrow where they 
pass from the posterior border and above the eyes, forming the 
small rounded palpebral lobes, after which they expand again 
slightly on each side of the glabella before the favial suture unites 
with the front border; surface of glabella thinly and irregularly 
tuberculated ; free-cheeks small, elevated, channelled around the eye 
and the border, the small area so inclosed covered with numerous 
rather coarse and irregular bead-like ornamentations ; eyes reniform, 
