PLATE X. 
Dalmanitks (Chasmops) anchiops. 
See Plate 9. 
Pig. 1. An imperfect cephalon. retaining a portion of the crust. 
Corniferous limestone. Falls of the Ohio. 
Fig. 2. A large pygidium, in the condition of an inteimal cast, from which the doublure and spine have 
been i-emoved. This figure is from a plastei- cast of Gi-een’s original of A.'iajjhu.s laticostatus. 
Schoharie grit. Ulster county. 
Pig. 3. A small pygidium, retaining the crust and showing oblique rows of nodes on the pleurse. 
Fig. 4. The same, enlarged one diameter. 
Schoharie grit. Schoharie, Schoharie county. 
Fig. 5. A small pygidium, retaining the crust and bearing an unusually long caudal spine. 
Schoharie grit. Schoharie, Schoharie county. 
Fig. 6. A larger pygidium. 
Schoharie grit. Schoharie, Schoharie county. 
Fig. 7. A pygidium, from which the tail-sj)ine has been broken. 
Oriskany sandstone. From the vicinity of BeCewville, Province of Ontario. 
Fig. 8. A large pygidiixm. 
Fig. 9. Profile of the same, showing the curvature and elevation of the spine. 
Schoharie grit. Schoharie, Schoharie county. 
Fig. 10. A small pygidium, preserved as an internal cast, and showing the impi-ession of the doublure and 
spine. 
Schoharie grit. Knxix, Albany county. 
Fig. 11. An enlargement to six diameters of the anterior extremity of the head represented on Plate 9, 
fig. 4, to show the crenulation of the frontal border. 
Fig. 12. A very large imperfect pygidium restored in outline. 
Schoharie grit Schoharie, Schoharie county. 
Fig. 13. A large, nearly entire pygidium, showing the tendency to duplication in the ideural annulations. 
Schohaiie grit. Schoharie, Schoharie county. 
Dalmanitks (Chasmops) anchiops, var. armatus. 
See Plate 9. 
Fig. 14. A restoration in outline of the entire animal, from the cephalon figured on Plate 9, Fig. S. 
