142 
PALEONTOLOGY OF NEW YORK. 
Observations. Cyphaspis minuscula has usually been observed as casts of the 
lower surfiice. Fragments of the cepbalon in this condition of preservation 
are far from uncommon in the decomposed chert of the Corniferous limestone. 
From Cyphaspis craspedota, of the Hamilton group, the species is distinguished 
by the more abrupt curvature of the frontal area of the cephalon, the longer 
genal spines, and the greater number of thoracic segments, none of which 
appear to bear any spines. It may be compared with Cyphaspis Haiti, Barrande, 
from the Bohemian etage E, which it closely approximates in the characters of 
the cephalon. In that species, however, the glabella is more elongate, the basal 
lobes less conspicuous, the pygidium relatively larger and with more annula- 
tions than in Cyphaspis minuscula. 
Distribution. Upper Helderberg group. Schoharie grit: Clarksville, Albany 
county. Corniferous limestone: Schoharie, Schoharie county; Phelps, Ontario 
county; LeRoy, Genesee county; Clarence, Erie county. In the decomposed 
chert boulders, Canandaigua and East Bloomfield, Ontario county; North 
Cayuga, Province of Ontario. 
Cyphaspis stephanophoka, n. sp. 
PLATE XXIV, FIGS. 2-6. 
Cephalon. Outline transversely semi-elliptical; length to width as I to 1.7. 
Genal angles produced into recurved spines which are longer than the 
axial length of the cephalon. Border spinose and thickened by doublure 
Frontal area narrow, convex and appressed about the glabella, anteriorly 
depressed by abrupt curvature to the thickened, slightly refiexed anterior 
margin. 
Facial Sutures, normal for the genus, originating on the occipital annula- 
tion just within the genal angles, passing obliquely forward and inward to 
the eye-lobe, thence forward and outward to the anterior margin. 
Glabella extending three-fourths the length of the cephalon, sub-pyriform, 
convex, bounded by a strong sulcus which becomes shallow over the ocular 
lobes. Basal lobes pyriform; baso-lateral furrows deep; antero-lateral im¬ 
pressions faintly discernible. 
