CRUSTACEA. 
145 
Glabella pyriform, convex; basal lobes conspicuous, sub-triangular; baso- 
lateral sutures strong; antero-lateral impressions inconspicuous. 
Surface ornamented by punctrn, which are strongest on the frontal area 
near the margin. They are also noticeable over the entire surface of the 
glabella, basal nodes, occipital ring and frontal margin; moderately strong, 
scattered tubercles are visible on the glabella and over the fixed cheeks. 
The frontal border also shows faint indications of a single row of low 
tubercles. 
The differences in this species and Cyphaspis ornata and Pha 'ethonides varicella 
are enumerated under the description of C. ornata. 
Distribution. Upper Helderberg group. Corniferous limestone; In boulders 
of decomposed chert, Canandaigua, Ontario county. 
Cyphaspis oknata. 
PLATE XXI, FIG. 1 ; and PLATE XXIV, PIG. 21. 
PMllipsiaf {B7'achymetopn.‘i ?) ornata. Hall. Illustrations of Devonian Fossils, pi. xxi, fig. 1. 1876. 
PMllipaia coronata, Hall. Miller’s Cat. Am. Palteoz. Fossils, p. 221. 1877. 
[.?] PMllipsia coronata ?, Walcott. Mon. U. S. Geol. Surv., vol. viii; Pal. Eureka Dist., p. 211. 1884. 
The original of this species consists of a fragment of the intra-sutural portion 
of the CEPHALON, and though additional specimens have come under observa¬ 
tion the other parts of the animal are still unkown. This portion of the 
head-shield is small, greatest length and width equal. Anterior outline the 
arc of a circle, whose center is at the middle of the occipital ring. Frontal 
area broad, explanate, closely appressed and slightly elevated about the 
margins of the glabella, thence depressed for about one-half its width and 
reflexed at the frontal margin. 
The facial sutures take their origin on the posterior margin near the genal 
angles, pass obliquely forward and inward over the ocular lobe, thence 
forward and outward to the anterior margin in the manner normal to the 
genus. 
Glabella about one-half the length of the cephalon, sub-ovoid, a little ele¬ 
vated along the axial line, separated from the frontal area and the ocular 
