CRUSTACEA. 
33 
convex bearing a pair of short lateral furrows which terminate centrally in 
two conspicuous depressions or pits, bounded posteriorly by a low sulcus, 
beyond which is a linguiform extension bearing upon its margin five spinules, 
one of which lies on the axial line, with two on either side. 
Distribution. “ Lower horizon of the Devonian limestone. Comb’s Peak, and 
on the divide at the head of the Reese and Berry Canon, Eureka District, 
Nevada.” (Walcott, he. cit.) 
CORONER A, N. s.-G. 
Dalmanites (Cokonura) aspectans. 
PLATE XII, FIGS. 1-11, 13. 
Asaplius aspectans, Conrad. Fifth Ann. Rept. Pal. N. Y., p. 49, fig-. 9. 1841. 
Amp?ms? denticulatus, Conrad. Fifth Ann. Rej^t. Pal. N. Y., p. 48. 1841. 
Dabnania adspectatis (in error). Hall. Descr. New Species of Fossils, etc., p. GO. 1861. 
Dalma7iia Helena, Hall. Descr. New Species of Fossils, etc., ji. 61. 1861. 
Balmania adspeetans (in error), Hall. Fifteenth Rept. N. Y. State Cab. Nat. Hist., p. 88. 1862. 
Dalmania Helena, Hall. Fifteenth Rept. N. Y. State Cab. Nat. Hist., p. 89. 1862. 
Balmanites Ohioensis, Meek. Proc. Acail. Nat. Sci. Phil., p. 91. 1871. 
Balmanites Ohioensis, Meek. Pal. Ohio, vol. 1, ji. 234, pi. xxiii, tig. 1. 1873. 
Balmanites denticulatns. Hall. Illustrations of Devonian P'ossils, pi. x, fig. 1. 1876. 
Balma7iites aspecta?is. Hall. Illustrations of Devonian Fossils, pi. xiii, figs. 6-8. 1876. 
Balmanites Helena, Hall. Illustrations of Devonian Fossils, pi. xiii, figs. 11-14. 1876. 
This species has been observed only in detached portions of the exoskeleton. 
The pygidia which have been described under the specific designations 
Dalmanites Helena and D Ohioensis {op. cit.), are not uncommon in the 
Corniferous limestone of New York and Ohio, and associated with them 
are fragments of large cephala, which presumptively can belong to no 
other species. Such a fragment of the cephalon, consisting of a free 
cheek retaining the visual surface of the eye, served as the original 
of the Asaphus aspectans of Conrad; more recently a larger fragment, also 
retaining the greater portion of the eye and agreeing in all particulars with 
Mr. Conrad’s type, has been found in the Corniferous limestone at Columbus, 
Ohio, associated with the pygidium of D. Helena.* There is no other 
* Through the kindness of Dr. J. S. Newberry this specimen has been made available for use in the 
revision of these species. 
