40 
PALEONTOLOGY OF NEW YORK. 
original of D. acanthopleiirus is from “near Schoharie, in limestone with Odonto- 
cephalus (Onondaga limestone).” 
Distribution. Upper Helderberg group. In the Corniferous limestone, near 
Clarksville, Albany county; Schoharie, Schoharie county; Canandaigua, 
Ontario county; Lime llock, near LeRoy, Genesee county. 
Dalmanites (Coronura?) emarginatus. 
PLATE XI A, FIGS. 7, 8. 
Bahnanites etiiarginahts, Hall. Illustrations of Devonian Fossils, pi. x, fig. 2. 1876. 
Of this species fragments of the pygidia only, have been observed, which may be 
characterized as follows : Outline sub-triangular, broadly emarginate behind ; 
apex of reentrant angle sub-acute. 
Axis narrow, tapering evenly to an apex near the posterior border and con¬ 
nected with the margin by a sharp, low ridge; it is composed of twenty 
to twenty-two transverse annulations. 
Pleurce, broad, slightly produced upon the postero-lateral areas, and bearing 
seventeen to twenty broad and flattened annulations, which show a slight 
tendency to duplicature toward the posterior extremity. The border is 
narrow at the sides and widens a little posteriorly, where all the annulations 
become obsolete ujion approaching it. Surface ornamented by pustules, each 
annulation bearing a single row upon the axis, and a double row upon the 
pleurae. The axis bears five longitudinal rows, one in the axial line, and two 
on either side. Upon the margin of the pygidium the pustules are more 
irregularly scattered. The lateral margins bear no spines and the posterior 
border is covered only with granulations. 
The dimensions of the shield are approximately 22 mm. in length, and 32 
mm. in width. 
Observations. This little known species presents points of similarity with 
Dalmanites aspectans, but differs in the following particulars, viz.: (a) the pos¬ 
terior margin is angulate and not transverse or crescentic, nor produced into 
