104 NEW YORK STATE MUSEUM 



PLATE 1 



Phacops logani Hall 



Page 21 

 Fia. . 



1, 2 Superior and profile views of a cephalon, showing the 



minute genal spinule and faint glabellar furrows 

 3, 4 Portions of other cephala in which the eye is retained 



5 A pygidium, showing the duplication of the lateral ribs. 



x3 



Dalmanites (Synphoria) stemmatus sp. nov. 



(See Plate 2) 

 Page 15 



6 An incomplete internal cast of the cepbalon, showing the 



frontal ornament and the fused glabellar lobes 

 7, 8 More complete specimens of the cephalon, showing 

 general form and structure 

 9 A front view of the latter, showing the elevation of the 



shield and eyes 

 10 A part of the head taken from a mold of the exterior 

 and showing the marginal ornament in detail 

 11, 12 Hypostomas of two individuals 



13 A small and unsymmetrical pygidium 



14 The internal cast of a large pygidium, its apparent width 



greatly increased by the loss of the posterior border 

 15, 16 Two pygidia of normal outline and structure 



