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PLATE XXIV. 
Cyphaspis^ ccelebs. 
Page 151. 
]. An imperfect specimen, the drawing having been made from a gutta-pefcha impression of the in¬ 
ternal surface, showing thegi-eat length of the genal spine, and the broad and rapidly tai)ering 
axis. Enlarged to three diameters. 
Lower Helderberg group. Scliohane, Schoharie county. 
Cyphaspis stephanophoka. 
Page 14-2. 
2. A cephalon, having the cheeks slightly depressed along the sutures; showing the upper row of 
marginal spines. Drawn from a natural cast of the inteinal surface. Enlarged to three 
diameters. 
3. The same, drawn in profile ; showing the elevation of the glabella, the convexity of the fi-ontal 
area. The figure is slightly i-estored to show the double row of marginal sjiines. 
Corniferous limestone. Canamlaigita, Ontario county. 
4. An imperfect cephalon, showing the bases of the tipper row of marginal spines, and of the thi-ee 
short spines on the occipital i-ing. Enlarged to thi-ee diameters. 
Cornifei-ous limestone. Canandaigua, Ontario county. 
5. The internal surface of an imperfect cei)halon, showing the length of the upper i-ow of mai-ginal 
spines. Enlarged to three diameters. 
Cornifei-ous limestone. Canandaigua, Ontano county. 
6. An imperfect cephalon, showing the bases of the upper i-ow of marginal spines and two spines of 
the lower row. Enlarged to three diameters. 
6a. Outline pi-ofile of the same, with the marginal spines restoi-ed. 
Corniferous limestone. Canandaigua, Ontario county. 
Cyphaspis minuscula. 
Page 110. 
See Plate 20. 
7. The intra-sutural portion of the cephalon. Enlarged to three diameters. 
Schoharie gi-it. Near Clarksville, Albany county. 
8. A similar fi-agment, showing the tubei-cles on the occipital i-ing. Enlai-ged to three diainetei-s. 
8a. Outline profile of the same, showing the elevation of the glabella and the slope of the frontal area. 
Corniferous limestone. Canandaigua, Ontario county. 
9. An entire individual, x'reserved as an internal cast in deconpiosed chei-t; showing the general 
form and pi-ox)ortions of the j^arts. Enlarged to three diametei-s. 
10. The same, drawn in jn-ofile. 
Coi-niferous limestone. Canandaigua, Ontario comity. 
11. A larger and less pei-fect individual. Enlarged to three diameters. 
Corniferous limestone. Canandaigua, Ontario county. 
12. An internal imiiression, showing the hyx)Ostoma slightly disj^laced from its normal xiosition. En- 
lai-ged to thi-ee diameters. 
Corniferous limestone. Canandaigua, Ontario county. 
Cyphaspis hiadema. 
Page 141. 
13. A portion of the cep>halon, .showing the strongly tubercled surface, and the single row of xnistules 
across the frontal area. Enlai-ged to six diameters. 
13a. Outline profile of the same, showing the dexn-essed frontal area, and the elevated mai-gin. 
Corniferous limestone. Canandaigua, Ontario cou7ity. 
