68 
PALEONTOLOGY OF NEW YORK. 
Dalmanites (Chasmops) macrops. 
PLATE XI B, FIGS. II, 15. 
Dalmmda macrops, Hall. Descr. New Species of Fossils, etc., ji. 59. 1861. 
Dalmania macrops, Hall. Fifteenth Kept. N. Y. State Cab. Nat. Hist., p. 87. 1862. 
--,-. Illustration of Devonian Fossils, pi. xiii, tig-s. 9, 10. 1876. 
(Not mentioned in the explanation of the jilate). 
A PORTION of the Cephalon is the only part of this species known. It is lunate 
in outline, border narrow and thin. 
Glabella long, equaling four-fifths the length of the shield Frontal lobe 
sub-rhomboidal, one-third wider than long; first pair of lateral furrows long, 
inclined backward and nearly meeting; second lateral furrows obsolete except 
at their proximal extremities; third lateral furrows inconspicuous, inclined 
a little forward. The first and second glabellar lobes are coalesced and some¬ 
what more elevated than the highest point of the frontal lobe. The third 
pair of lobes is inconspicuous and transverse. Occipital furrow narrow and 
shallow; occipital ring broad, rounded and strongly arched. 
Eyes very large, elevated above any other portion of the cephalon. 
Visual surface measuring 9 mm. in height, and bearing about 500 lenses. 
Palpebrum scarcely prominent; palpebral lobe relatively small and closely 
appressed to the compound middle lobe of the glabella. Orbital sulcus 
distinct. 
The Cheeks appear to have been relatively small and depressed or flattened 
near the margin. 
Surface finely pustulose ujion the glabella, smooth or granulose upon the 
cheeks and occipital ring. 
The single specimen by which this species is represented has a length of 
20 mm., and a width of 38 mm., and presents about the characters which, 
from comparison with the species Dalmanites Calypso, might be expected in 
the cephalon of D. Erina. Whether the latter species, which is now known 
only from its pygidia, should be united with D. macrops must be left to a 
more complete knowledge of these fossils. 
Distribution. Upper Helderberg group. Corniferous limestone ; Schoharie. 
