PLATE XIX A. 
Lichas (Conolichas) Biqsbyi (?). 
Page 80. 
Fig. 1. A very large pygidiuin, drawn from a gutta-pei’cha mould of the internal surface. One of the 
terminal spines in the specimen has been broken. This form of pygidiuin was formerly refer¬ 
red to the species Lichas picstulosus, but as the cephalon of that species is now known to have 
been accompanied by the form of pygidium represented on plate 19, fig. 8, this is referred with 
some hesitation to the species Lichas Bigshyi, Hall. 
Lower Helderberg group. Schohane, Schoharie county. 
Lichas (Conolichas) Eriopis. 
Page 78. 
Fig. 2. The intra-sutural portion of a cephalon, natural size, retaining the right palpebrum and a portion 
of the crust. 
Fig. 3. The same, enlarged to two diameters. 
Fig. 4. The same, viewed from the fi-ont, showing the coinpai-ative elevation of the glabellar lobes. Simi¬ 
larly enlai’ged. 
Fig. 5. The same, viewed in profile. Similarly enlarged. 
Corniferous limestone. Schoharie, Schohane county. 
Fig. 6. A fragment of a smaller cephalon, enlarged to two diameters. 
Corniferous limestone. Schoharie, Schoharie county. 
Fig. 7. The right movable cheek, enlarged to two diameters. 
Corniferous limestone. Canandaigua, Ontario county. 
Fig. 8. Anothei- specimen of the right cheek, somewhat distorted ; enlarged to two diameters. This and 
the iireceding figures are drawn from gutta-percha casts of natural moulds in decomposed chei’t. 
Corniferous limestone. Canandaigua, Ontano county. 
Fig. 9. A pygidium, showing the general proportions and the broken bases of the axial and pleural spines. 
Enlarged to two diameters. 
The marginal spines have been drawn with disproportionate lengths, the first pair being much too 
short, the second and third x^airs not long enough and the terminal pair too long. For the cor¬ 
rect repi'esentation of these spines, see fig. 1.5. 
Corniferous limestone. Schoharie, Schoharie county. 
Fig. 10. An imxierfect pygidium, natural size. 
Corniferous limestone. Schoharie, Schohane county. 
Fig. 11. An imperfect xiygidium, showing the internal surface. 
Corniferous limestone. Schoharie, Schoharie county. 
Fig. 12. A fragment of a very large pygidium. 
Upper Helderberg limestone. Williamsville, Errie county. 
Fig. 13. A piygidium, showing the axial sxune, and the length of the i^leural and marginal spines. The 
original is an internal cast in decomxoosed chert. Enlarged to two diameters. 
Fig. 15. A restoration of the pygidium, drawn from the x^receding sxiecimen, showing the normal character 
of the axial, pleural and marginal spines. 
Fig. 16. Profile view of the same, showing the length of the axial spine. 
Corniferous limestone. Canandaigua, Ontario county. 
Lichas (Conolichas) hispidus. 
Page 77. 
Fig. 14. A x^ygidium, natural size, showing the aspinose surface and the short marginal spines. 
Fig. 17. The same, enlarged to two diameters. The larger tubercles upon the pleural annulations do not 
represent the bases of spines. 
Schoharie grit. Schoharie, Schoharie county. 
Fig. 18. An imperfect pygidium, natural size, drawn from a cast in decomposed chei-t. 
Corniferous limestone. LeRoy, Genesee co^unty. 
