DEVONIAN FAUNAS. 339 
mentary condition. Fragments of the pygidia and thoracic segments 
occur abundantly, but the heads are less common. The species has 
also’ been observed in the Becraft limestone fauna, and specimens 
from this lower horizon are indistinguishable from those in the 
trilobite bed. The most perfect specimen of the head of this species 
which has been observed is not so greatly produced anteriorly as is 
indicated in the restoration of the head of the species given by Hall 
and Clarke. 
DALMANITES DENTATUS Barrett. 
Plate XLIV., Figs. 1-3. 
1876. Dalmanites dentata Barrett, Am. Jour. Sci. (3), vol. IL., p. 
200, plate. 
1888. Dalmanites (Corycephalus) dentatus Hall and Clarke, Pal. 
ING) vol. iVdE p58) pli lA ties VAG: 
Description—Head_ subcrescentiform, the lateral and anterior 
margins forming a parabolic curve, the genal angles extended into 
rather blunt spines. Glabella depressed-convex, broadest in front, 
surrounded by a well-defined dorsal furrow, frontal lobe broader than 
long, subelliptical to subrhomboidal in outline. First pair of lateral 
furrows broad and deep, extending obliquely backward from the dorsal 
furrow and connected across the median portion of the glabella by a 
shallow depression. First and second lateral lobes partially 
coalescent externally by the shallowing of the second lateral furrows, 
the third pair of lateral lobes entirely separate from the second. 
Second and third pairs of lateral furrows indistinctly continuous 
across the median portion of the glabella by slight depressions. 
Occipital furrow sharply defined, continuous across the glabella and 
extending out upon the cheeks. Occipital segment of about the 
same width, but a little higher than the posterior lateral lobes. 
Cheeks convex in general contour, with a slightly-thickened marginal 
border. Hyes large, subcrescentiform, their summits as high or higher 
than the glabella, their anterior extremities opposite the first and their 
posterior extremities opposite the third lateral furrows of the 
glabella, bounded externally around the base of the faceted surface by 
a sharp depression, beyond which is a subangular ridge. Between 
this ridge and the slightly-thickened cheek margin the surface is 
