PLATE XIX B. 
Lichas (Hoplolichas) hyl^us. 
Page 81. 
See Plate 2E). 
Fig. 1. An imperfect cephalon, wanting the movable cheeks and the occipital ring, but showing the char¬ 
acter of the glabellar lobes. 
Fig. 2. Profile of the same, showing the elevation of the frontal and lateral glabellar lobes. 
Upper Helderberg limestone. Province of Ontario. 
Lichas (Arges) contusus. 
>i Page 83. 
Fig. 8. A cephalon, wanting the movable cheeks ; showing the elongate frontal lobe, the short and broad 
lateral lobes, and the relatively broad genal areas. The oiiginal is a cast of the internal 
surface, which makes the cephalic furrows appear broader and deeper than when the crust is 
j'etained. Enlarged to two diameters. 
Corniferous limestone. Canandaigua, Ontario county. 
Fig. 4. A cephalon, wanting the movable cheeks, but I'etaining a iiortion of the crust. 
Fig. 5 The same, enlarged to two diameters. 
Fig. 6. The same in profile, enlarged to two diameters, showing the regular convexity of the frontal lobe, 
its elevation above the lateral lobes for its entire length, the convexity of the genal area, and 
the elevation of the occipital ring. 
Corniferous limestone. Near Clarksville, Albany county. 
Lichas (Ceratoltchas) gryps. 
Page 84. 
Fig. 7. The intra-sutural portion of a cephalon, i’etaining the crust and showing the gently undulate 
frontal border, the short, abi-uptly elevated frontal lobe, the depressed lateral lobes, and also 
the bases of two spines on the frontal lobe; of one spine on each cheek just within the eye- 
node, and a single long recurved and slightly incurved spine on the occipital I’ing, accompanied 
by the base of a second, the latter spine being restored in outline. Enlarged to two diameters. 
Fig. 8. A profile of the same similarly enlarged, the bi’oken spines being restored in outline. 
Corniferous limestone. Schohane, Schoharie county. 
Fig. 9. A small cephalon, showing the bases of the three pairs of spines. The sjiecimen is inclined forward 
somewhat more than in the drawing of fig. 7, foreshortening the fi-ontal lobe. The original is 
an internal cast in decomposed chert. Enlarged to three diameters. 
Fig. 10. The same, in profile. 
Fig. 11. The same, viewed from the front. 
Coi’hiferous limestone. Canandaigua, Ontario county. 
Fig. 12. A fragment of the middle lobe of the glabella, showing the length and character of its spines. 
Fig. 12a. The same, enlarged to two diametei’s. 
Fig. 13. The same, similarly enlarged and viewed in pi’ofile, showing the length and curvature of the gla¬ 
bellar spines. 
Corniferous limestone. Canandaigua, Ontario county. 
