142 PALEONTOLOGY OF NEW YORK. 



Observations. Cyphaspis minuscula has usually been observed as casts of the 

 lower surface. Fragments of the cephalon 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 Halli, 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 stephanophora, n. sp. 



PLATE XXIV, FIGS. 2-6. 



Cephalon. Outline transversely semi-elliptical; length to width as 1 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 reflexed 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 

 i lie 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. 



