30 
PALEONTOLOGY OF NEW YORK. 
be regarded as a specimen of the latter species. The fragmentary specimen 
represented on plate Ixxv, fig. 1, is from a locality in Pennsylvania, and its 
coalesced glabellar lobes indicate a distinct species. 
Distribution. Lower Helderberg group. Near Clarksville, Albany county; 
Schoharie, Schoharie county. Oriskany sandstone: Township of Walpole, 
Province of Ontario. Corniferous limestone: Clarence Hollow, Erie county; 
Lime Rock, Genesee county. 
Dalmanites (Hausmannia) concinnus. 
PLATE XI A, FIGS. 9-11. 
Dahmnites concinims. Hall. Illustrations of Devonian Fossils, pi. x, fig's. 3-5. 1876. 
Pygidium only known. Outline sub-triangular, posteriorly acuminate. Surface 
convex, trilobate. 
Axis relatively narrow, width less than one-third that of the shield, slightly 
elevated along the axial line, and tapering to an abrupt termination within 
the margin; bearing nine to ten flattened transverse annulations, which are 
thickened or faintly nodose on the axial line. 
Pleur(B broad, deflected in an even curve to the margins and bearing seven 
or eight annulations which are broad, low and flat, and are separated by fine 
narrow sulci. The first five annulations are grooved by fine impressed 
lines, which extend to the margin. The anterior and posterior limbs thus 
formed are of equal strength. The margin is slightly thickened, becoming 
wider posteriorly and produced into a short and stout caudal spine. Surface 
smooth or minutely granulose. 
Dimensions. The largest pygidium observed has a length of 16 mm., and 
a width of 18 mm.; the smallest a length of 9 mm., and a width of 10 mm. 
Distribution. Upper Helderberg group. Schoharie grit, Schoharie, Schoharie 
county; near Clarksville, Albany county; Corniferous limestone, near Caledonia, 
Livingston county; Cayuga, Province of Ontario. 
Dalmanites (Hausmannia) concinnus, var. serrula, n. var. 
PLATE XI A, FIG. 12. 
A SINGLE very small pygidium measuring 4 mm. in length and width bears 
all the characters of the normal pygidium, but has in addition to them a row 
