110 FIFTEENTH REPORT ON THE CABINET OF NAT. HISTORY. 



A portion of a head, obtained from limestone of the same age in 

 another locality, resembles the head of L. bigsbyi. The median lobe 

 is very gibbous, rising almost vertically in front, somewhat abruptly 

 narrowed and depressed behind, separated by a distinct furrow from 

 the anterior and middle lobes : anterior lobe gibbous, oblong, wider 

 behind than before, without distinct limitation between it and the 

 middle lobes. Occipital furrow strongly marked, with a wider 

 occipital ring : palpebral lobe small. Eye almost semicylindrical. 

 Entire surface pustulose : pustules of unequal size. 



The anterior lobe of the glabella is less abruptly gibbous in front, and 

 more gradually tapering behind, than in the other species : the form of the 

 lateral lobes is also distinctive, and the pustules on the surface more ele- 

 vated and unequal. 



Geological formation and locality. The pygidia are from the upper 

 member of the Upper Helderberg group at Williamsville, and the head 

 from the same position in Schoharie county, N.Y. 



^-^ LICHAS GKANDIS ( n. s.). 



A remarkable fragment, which appears to be the posterior part 

 of the head of a Lichas, preserves the base of the anterior lobe of 

 the glabella, which is narrowed and depressed between the lateral 

 lobes, and spreads a little towards the occipital furrow. The lateral 

 lobes are large, broad and strongly elevated, the summits surmounted 

 by elongate nodes, with smaller nodes or tubercles upon other parts 

 of the surface. The occipital furrow is of moderate width and depth; 

 the occipital ring wide and strong, the anterior portion with nume- 

 rous small tubercles, and the posterior p)ortion ornamented by four 

 strong elevated clavate nodes. 



This .fragment agrees perfectly with Lichas in the disposition of the 

 parts of the head preserved, viz. the remains of an anterior lobe and two 

 lateral lobes, with a strong occipital ring. The specimen is more than three 

 inches in diameter ; and from the occipital ring to the broken anterior 

 margin, it is two and a half inches. 



Geological formation and locality. In the Schoharie grit : Schoharie. 



GENUS ACIDASPIS (Murchison). 



Some fragments of trilobites have been found in the Schoharie grit, 

 which may belong to this genus. Up to this time, however, the specimens 

 obtained are too imperfect and unsatisfactory for description. 



[ September, 



