140 
PALEONTOLOGY OF NEW YORK. 
lobe; thus making ten of these projecting points to the whole of the free 
posterior and lateral margins. The surface shows a finely granular appear¬ 
ance under a magnifier.” 
This pygidium is different in many respects from the others here referred to 
the genus Pha'ethonides^ and is more nearly similar to the forms which it was 
the evident intention of M. Barrande to include under the term Phaeton. The 
glabella found in association with the pygidium, if correctly referred to the 
same species, is also different from those of the other American members of 
the genus, being distinctly proetoid and conforming with that of Phaeton plani- 
cauda and PA. striatus, Barrande. This species, when better known, may serve 
to establish the group designated by M. Barrande with the preoccupied term 
Phaeton, as generically distinct from Phaethonides. 
Distribution. From the west side of Steptoe Valley, Nevada; “Although not 
found associated with other fossils, they are believed to belong to the Devo¬ 
nian epoch.” (Meek, loc. cit.) 
CYPHASPIS, Burmeister, 1843. 
Cyphaspis minuscula. 
PLATli XX, FIG. 17; and PLATE XXIV, FIGS. 7-12. 
Phillipsia mhmscula. Hall. Illustrations of Devonian Fossils, pi. xx, figs. 17. 1876. 
General Form and Proportions. Outline ovate, posteriorly sub-attenuate. 
Surface depressed-convex, sub-equally trilobate. Axis evenly tapering. 
Length to width as 3 to 2; axial length of cephalon, thorax and pygidium 
as 3 to 6 to 1. 
Cephalon semi-elliptical in outline, curvature slightly changing at the genal 
angles, which are produced into spines having an outward curve and reaching 
almost to the pygidium. 
The facial sutures take their origin on the posterior margin near the genal 
angles, pass obliquely forward over the palpebral lobe, thence outward and 
forward, approximating toward the margin and terminating on the frontal 
doublure. 
