1 18 PALEONTOLOGY OF NEW YORK. 



two species, of which only the cephala are known, may belong to the same 

 nis. but in the absence of conclusive evidence they are allowed to remain 

 under the genus Cyphaspis, with which they agree in the characters of the 

 head-shield. 



Cyphaspis craspedota, n. sp. 



PLATE XXIV, FIGS. 15-20. 



pare PhUlipsia coronataf Walcott. Monogr. U. S. Geol. Surv., vol. viii; Pal. Eureka Dist., p. 211. 



1SS4. 



General Form and Proportions. Outline regularly oval, interrupted only by 

 the projection of the genal spines. 



Surface convex, conspicuously and sub-equally trilobate. Axis prominent, 

 elevated; pleurae abruptly deflected on the lateral slopes. Length to width 

 as 3 to 2. 



Cephalon. Outline nearly semicircular; length to width as 1 to 1.6. Border 

 thickened, slightly reflexed, produced at the genal angles into spines which 

 reach to the sixth thoracic segment. Doublure narrow, epistoma indistin- 

 guishable. Marginal sulcus broad; frontal area convex near the glabella, 

 lateral areas depressed-convex, and abruptly sloping. Occipital furrow and 

 ring distinct, the latter thickened at the cenfer. 



Facial Sutures normal. 



Glabella ovate or sub-pyriform, evenly convex, slightly flattened above ; 

 bounded on all sides by a strong sulcus, which is shallowest near the palpe- 

 bral lobes. Basal nodes conspicuous, pyriform or sub-triangular. Baso- 

 lateral furrows strong; anterolateral impressions faint, and discernible only 

 in casts of the lower surface. 



Cheeks depressed and sloping abruptly from the eye-lobe to the thickened 

 border. 



Eyes conspicuously elevated, attaining the height of the glabella; base 

 sub-pedicellate, slightly constricted. Visual surface sub-lunate, smooth, when 

 strongly magnified, showing numerous homo-corneal lenses. Palpebral lobe 

 strong, not projecting, sloping abruptly to the palpebral sulcus. 



