62 
PALEONTOLOGY OF NEW YORK, 
Dalmanites (Chasmops) anchiops, var. armatus. 
PLATE IX, FIGS. 7-9. 
Pliacops anchiops, Hall. Foster and Whitney’s Geol. Kept. Lake Superior, p. 124. 1851. 
Dalmania anchiops, var. armata. Hall. Descr. New Species of Fossils, etc., ii. 56. 1861. 
Dalmania anchiops, var. annata. Hall. Fifteenth Rept. N. Y. State Cab. Nat. Hist., p. 84. 1862. 
Dalmanites anchiops, var. armata. Hall. Illustrations of Devonian Fossils, pi. ix, figs. 2, 7, 8. 1876. 
The points of variation in these specimens may be thus summarized; (a) the 
spine upon the occipital ring is very long, round and very stout toward the 
base. Its length is sometimes quite equal to the length of the glabella, while 
in the typical forms of the species the spine is not more than one-third or 
one-fourth of that length; (b) the genal spines are inconspicuous or obsolete; 
(c) the surface, as shown in casts of the exterior, is free from tubercles or 
other ornamentation; (d) the eyes appear to be less elevated and bear fewer 
corneal lenses. 
As the cephala of this character have not been found in conjunction with 
the other parts of the animal, it is impossible to determine whether the thoraces 
and pygidia belonging thereto, also varied from the type, since none of these 
parts have been seen which show any variation from the normal form. The 
largest cephalon observed has a length of 80 mm., and a width of 116 mm., 
indicating an animal upwards of 200 mm. in length when entire. 
Dalmanites anchiops, var. sobrinus, n. var, 
PLATE IX, PIG. 11. 
Dalmanites, n. sp. ? Hall. Illustrations of Devonian Fossils, pi. ix, fig. 11. 1876. 
A SINGLE CEPHALON from the Schoharie grit has the general proportions of the 
species, but shows a variation from the foregoing in the following particulars, 
viz.; (a) the glabella is much more convex, and projects slightly beyond the 
frontal margin, (b) the genal angles appear to be without spines, (c) the 
occipital ring bears no spine, (d) the facial suture, where it crosses the sum¬ 
mit of the cheek, lies in a much deeper sulcus. The original is a cast of the 
lower surface and is somewhat imperfect, but its features seem to be dis¬ 
tinctly varietal. 
