PALAEONTOLOGY OF NEW YORK. 



. Lichas {Arges) contusus, in all known features bears a close simi- 

 larity to /.. granulosus, F. Roemer (Verstein d. Harzgebirges, Beitr. iii, pi. xx, 

 fig. 9), and /.. Haueri, Barrande (Syst. Sil., pi. xxviii, figs. 38-44), the former 

 from the Stringocephalen Kalk (middle-lower Devonian) and the latter from 

 Etage V of the Bohemian basin. These species are all representatives of the 

 sub-genus Arges, Goldfuss, which is characterized by the elongate, sub-rectangu- 

 lar and evenly arched frontal or mesial lobe; relatively short, coalesced first 

 and second lateral lobes; obsolete third lobes and convex fixed cheeks. The 

 type of Arges (A. armatus, Goldfs.) bears a pair of strong spines upon the glabella, 

 but this appears to be a variable feature in this group. 



Distribution. Upper Helderberg group. Corniferous limestone: Near Clarks- 

 ville, Albany county ; Cherry Valley, Otsego county. In the boulders of decom- 

 posed chert, Canandaigua, Ontario county. 



CERATOLICHAS, n.s.-g. 

 Lichas (Ceratolichas) gryps, n. sp. 



PLATE XIX is, FIGS. 7-13. 

 Acidaspti, a sp.1 Hall. Illustrations of Devonian Fossils, pi. xix, fig\ 1 (not figs. 2 and 3). 1876. 



[ntra-sutural poil ion of the cephalon only known. Outline sub-semicircular, 

 slightly trilobate on the anterior margin. Surface convex, elevated, trilo- 

 bate. Margin narrow, slightly thickened. 



Glabella large, embracing nearly the entire cephalon. Frontal lobe ellip- 

 soidal, convex or tumid, elevated behind, sloping abruptly to the sides and 

 posterior margin, and becoming obsolete at or just behind the center of the 

 shield. It hears at its summit two strong, diverging, recurved spines which 

 nearly equal the glabella in length. Longitudinal furrows sub-parallel, 

 diverging near the frontal margin. Lateral lobes depressed, becoming obso- 

 lete; the members of the first and second pairs have coalesced, and the third 

 P air can '"• detected only as low, obsolescent nodes bearing a faint tubercle. 

 Near the outer edge of the lateral lobes, and just within the eye-lobes, are 

 slender, ereel spines, usually represented only by their broken bases. The 



