150 
PALEONTOLOGY OF NEW YORK. 
Observations. Cyphaspis craspedota is not an uncommon species in the basal 
limestones of the Hamilton group in the township of Canandaigua, where a 
few entire individuals and parts of several hundred others have been found. 
Its occurrence in other localities of this formation has not been noticed. . The 
species is closely allied to Cyphaspis Burmeisteri, Barrande (Sys. Sih, vol. i, 
p. 484, pi. xviii, figs. 61-71), from the etages D and E. This similarity is 
apparent in the general form and proportions, the position of the eyes, length 
of the genal spines and character of the surface ornamentation. Moreover the 
sixth thoracic segment in C. Burmeisteri bears a strong spine, as in our species, 
but the occipital ring and fourth segment in the former species, are without 
spines. Barrande has also shown that the number of thoracic segments for 
mature individuals of his species is fourteen; in immature examples varying 
from seven to thirteen. All the entire individuals of C. craspedota show but 
twelve segments. The pygidium of the Bohemian species is also larger and 
more strongly segmented. C. craspedota probably finds a congener in the 
C. hydrocephala, Maurer, of the German middle Devonian (Fauna der Kalke 
von Waldgirmes bei Giessen, pi. xi, figs. 20-22, not C. hydrocephala, A. Roemer, 
1845; Barrande, 1852; Kayser, 1878). 
Distribution. Hamilton group. In the shales and limestones directly over- 
lying the Marcellus shales: Near Genterfield, township of Canandaigua, Ontario 
county. 
• Cyphaspis l^vis. 
PLATE XXI, PIG. 29. 
Philli'psia ItBvis, Hall. Illustrations of Devonian Fossils, pi. xxi, fig. 29. 1876. 
Cephalon minute, outline semi-elliptical; surface convex; border conspicuous, 
elevated and rounded, produced at the genal angles into moderately long, 
slightly incurving spines ; marginal sulcus deep ; frontal area evenly convex. 
Facial sutures normal, crossing the frontal area somewhat abruptly. 
Glabella sub-ovoid, convex; basal lobes sub-pyriform, conspicuous; antero¬ 
lateral depression faint. Occipital ring not retained. 
