406 Prof. ¥. M‘Coy on the Classification of 
mental furrows, except the first, on the lateral lobes, and by the 
more pointed outline and narrow margin. 
Not uncommon in a Lower Silurian schist over the iron-works 
at Tremadoc ; very similar in appearance to that at Pomeroy, co. 
Tyrone, w hich afforded the species to Col. Portlock. 
(Col. University of Cambridge.) 
Griffithides meso-tuberculatus (M‘Coy). 
Sp. Char. Cephalothorax 10 lines wide; glabella widely pyri- 
form, broadly rounded in front, gently couvex and narrowing 
posteriorly with concave sides, very minutely granulated, length 
5 lines, width 4 lines; cheeks triangular, flat, smooth ; eyes 
large, reniform, very minutely reticulated, with a large convex 
eye-lobe * connected with the base of the glabella by a small, 
oblique, oval nucleus ; limb broad, convex, with nine or ten 
imbricating striz, two-thirds concealed in front of the gla- 
bella, ending posteriorly in acute spies as long as the glabella ; 
neck-segment broad ; pygidium 6 lines long and 73 lines wide ; 
axal lobe 2 hnes wide, cylindrical, slightly tapering, of sixteen 
rings, each ornamented with about ten lengthened oval tuber- 
cles ; lateral lobes depressed, of ten broad, * flat divisions, each 
having a fine impressed hne running close to its posterior 
niargin, smooth to the naked eye, but with a strong glass one 
or two rows of minute crowded granules are seen ; margm 
wide. 
The axal lobe of the pygidium being strongly tubereulated and 
the lateral lobes nearly smooth, distinguish the species from all 
other carboniferous Trilobites I know of. It is allied to the 
G. calcaratus (M‘Coy) and G. longispinus (Portk.). 
Common in the shales of the carboniferous limestone of Der- 
byshire. 
(Col. University of Cambridge.) 
Crypheus Sedgwicku (M‘Coy). 
Sp. Char. Cephalic shield subsemicircular ; glabella slightly cla- 
vate, smooth, three segmental furrows on each side, the pos- 
terior pair longest, turning backwards and inwards nearly to 
the neck- furrow, inclosing a triangular space on each side 
longer than w ide, the width rather less than that of the undi- 
vided portion of the glabella between their bases, the two an- 
terior pair of furrows shorter; cheeks broad, gently convex, 
closely and coarsely pitted: thorax, axal lobe very convex, narrow, 
shghtly tapering, nearly parallel- ‘sided, smooth, of twelve seg- 
* Eye-lobe seems preferable to eye-lid for the lobe covering the inner and 
irpper aspect of the eye. 
