Carboniferous Limestone Trilobites. ; 451 
General form an elongated oval; head semicircular, glabella 
rounded anteriorly, the raised central portion marked by two short 
lateral furrows on each side, and by the usual rounded basal lobes, 
surrounded in front of the eyes by a rather broad, flat, circular 
border formed by the fixed cheek, which contracts behind the eyes, 
but extends obliquely outwards on each side from the neck-lobe, 
which is rather wider and more strongly marked than the succeed- 
ing free segments of the thorax. : 
Eyes moderately large, reniform, smooth, or when the faceted 
surface is visible, the lenses are very minute. Free cheeks 
forming an acute angle on the anterior border, and elongated 
posteriorly into spines which reach to the fifth thoracic somite. 
Raised portion of the cheek sparsely granulated, border smooth and 
broad, under margin striated. The nine free thoracic somites are 
nearly of equal size, the raised axis being slightly broader than its 
pleuree; the axis smooth, pleura very minutely granulated and 
bluntly terminated. ) 
_ Axis of pygidium composed of sixteen coalesced somites with four 
to five granules in a row on each axial somite, about thirteen lateral 
ridges to the pygidium with about six granules on each; margin 
narrow, smooth. 
Formation.—Carboniferous Limestone. 
Localities.—Bolland, Yorkshire; Clithero, Lancashire; Derby- 
shire; Kildare; St. Doolagh, Co. Dublin; Limerick, west of 
Dromore Wood; Hook Head, Wexford; and Little Island, Cork. 
Many specimens of Phillipsia gemmulifera have been examined 
from the British Museum, the Museum of Practical Geology, the 
Museum of the Geological Survey of Ireland, the Woodwardian 
Museum, and a single specimen from the private collection of John 
Aitken, Esq., Sandfield, near Manchester, ete., and from the collection 
of Joseph Wright, Esq., F.G.S. 
PHILLIPSIA TRUNCATULA, Phil., sp., 18386. Pl. XI. Fig. 4. 
Asaphus truncatulus, Phillips. 1836. Geol. Yorks, vol. ii. pl. xxii. fig. 12, 13. 
Phillipsia ornata, Portlock. 1843. Rep. Geol. Lond. p. 307, pl. xi. fig. 2a. 
——— wuncatula, M‘Coy. 1844. Syn. Carb. Foss. Ireland, p. 163. 
———— ~———__—. H]. Woodw. 1883. Pal. Soc. Mon. Carb. Trilob. part i. 
p. 21, pl. ii. figs. 9-14. 
Head-shield broadly arched; glabella twice as long as broad, 
rounded in front, only slightly elevated ; basal lobes rather produced, 
with three short lateral furrows on each side, two of which are 
anterior to the compound eyes; neck lobe distinctly marked, and 
like the surface of the glabella rather closely granulated; fixed 
cheek narrow behind, forming a small, rounded, palpebral lobe above 
each eye, and expanding into a wide flat circular border in front of 
the glabella; eyes reniform, smooth; raised portion of the free 
cheek sparsely granulated; border. smooth and broad, terminating 
in a strong short cheek-spine which is striated beneath. 
Thoracic rings wanting. 
Pygidium.—Axis composed of eighteen coalesced somites, with six 
