484 Dr. H. Woodward— Synopsis of the Species of 
GRIFFITHIDES LoNGICEPS, Portlock, 1843. Pl. XII. Fig. 3. 
Griffithides longiceps, res ape Rep. Geol. Londonderry, p. 310, tab xi. 
GS. (a, O. 
MGoy. 1844, Synopsis Carb. Foss. Ireland, p. 160. 
Morris (in part), 1854. Cat. Brit. Foss. p. 109. 
H. Woodw. (im part) 1877. Cat. Brit. Foss. Crust. p. 37. 
H. Woodw. 1883. Pal. Soc. Mon. Carb. Trilob. parti. p. 33, 
pl. vi. figs. 7, 8, 9. 
General form ovate-oblong; head-shield very large in proportion 
to the rest of the body, forming two-fifths of the entire length ; 
glabella very gibbous, pyriform, basal lobes obtusely triangular, 
with a tubercle on the centre of each; fixed cheeks very narrow, 
but expanding rather at the sides of the glabella in front of the 
eyes; axal portion of the neck-lobe very broad, and separated by 
a strong furrow, and bearing one tubercle on its centre; eyes 
moderately large, reniform surface very finely faceted; raised inner 
portion of free cheek rather narrow, surface finely granulated, outer 
margin wide, posterior angles produced into broad and stout spines, 
reaching to the fifth segment of the thorax; thorax composed of 
nine free segments, the axis arched, equalling half the entire breadth 
of the thorax; each segment bordered by ten or eleven granules on 
its axis along the posterior border, and seven or eight on each pleura ; 
pleurz rounded at their extremities, pygidium composed of thirteen 
coalesced somites, ornamented in a similar manner to the free thoracic 
ones; axis tapering to a blunt extremity, and surrounded at its 
termination by the smooth border of the tail-shield; ribs nine in 
number, dying out near the margin. 
Formation.—Carboniferous Limestone. 
Localities.—Settle, Yorkshire ; Cookstown, Tyrone ; Creggane, 
Limerick; Brockley, near Lesmahagow. 
Specimens have been examined from the Museum of Practical 
Geology, Jermyn Street; the Woodwardian Museum; the Museum 
of Geological Survey of Ireland, and from Mr. John Young’s Collection. 
GRIFFITHIDES PLATYCEPS, Portlock, 1848. 
Griffithides platyceps, Portlock. 1848. Rep. Geol. Lond. p. 311, pl. xi. fig. 8, 
———_—_ ————— Morris. 1854. Cat. Brit. Foss. p. 109. 
H. Woodw. 1877. Cat. Brit. Foss. Crust. p. 37. 
H. Woodw. 1883. Pal. Soc. Mon. Carb. Trilob. part i. p. 
34, pl. vi. fig. 13. 
Only the glabella of this species is known, but as it presents some 
peculiarities, and General Portlock was always so careful an observer, 
we may safely quote his remarks in case other and more perfect 
remains should be discovered. | 
“This is,” he remarks, “a larger individual of probably another 
species (distinct from G. longiceps), the surface is granular, and it is 
proportionately flatter. It may be called Griffithides platyceps” 
(“Report on the Geology of Londonderry and Tyrone,” p. 311). 
From the Carboniferous Limestone of Derryloran, Tyrone, Ireland. 
The one specimen examined is from the Museum of the Geological 
Survey of Ireland, Dublin, and is probably Portlock’s original 
