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PALMONTOLOGY OF NEW YORK. 
lobes being coalesced, and the first and third pairs of furrows uniting to form 
a single pair of longitudinal furrows which extend in a broad curve from the 
anterior margin to the occipital furrow. Third glabellar lobes obsolete. 
Lateral lobes elongate, bounded on the sides by sigmoid curves, and sepa¬ 
rated from the frontal lobe, the eye-lobe and the margin by furrows of equal 
strength. 
Facial normal. Eye-lobe slightly depressed. Fixed portions of the 
cheeks short, abruptly deflected to the occipital furrow. Free portions of 
the cheeks and the occipital ring not observed. Border narrow, thickened; 
marginal sulcus strong. 
Surface evenly covered by fine closely crowded tubercles, which are 
strongest upon the posterior portion of the frontal lobe; not, however, 
becoming spiniform. 
An HYPOSTOMA found in association with this head is sub-quadrate in outline, 
convex on the anterior margin, broadly emarginate behind, the postero-lateral 
areas being broad and rounded. The centrum is small, sub-hemispherical, 
distinctly defined in front and at the sides, merging behind into the elevated 
median area. The longitudinal furrows are broad and deep and from these 
two pairs of obscure, oblique sulci pass inward over the median area, leaving 
between them a pair of inconspicuous nodes just behind the centrum. The 
margins near the antero-lateral angles are strongly elevated. The surface 
of the centrum is covered with fine tubercles. 
Eimensions. The single cephalon observed measures 16 mm. in length and 
25 mm. in width at the occipital furrow. The length of the hypostoma is 9 
mm.; its width 16 mm. 
Observations. The sub-genus Hoplolichas, Dames, includes a series of Silurian 
species (Lichas iricuspidatus, Beyrich ; L. prohoscideus, Dames; L. conico-fuher- 
culatus, Nieszkowski; L. Plautini, Schmidt; L. longispina, Schmidt; L. furcifer, 
Schmidt), with which this fossil agrees in the form and contour of the head, 
especially of the frontal lobe. This lobe is more clavate, never so elevated or 
