212 NEW YORK STATE MUSEUM 



PLATE 4 



(All originals in state museum unless otherwise stated) 



Isotelus of. maximus Locke 

 p. 59 



Fig. 



1 Pygidiurm of a very youngi example partly decorticated and 



showing muscular impressions, x 5 

 Pebble of group 7 



Remopleurides tumidus sp. nov. 

 p. 54 



2 Dorsal view of cranidium. x 2 



3 Frontal view of game, x 2 



4 Lateral view of same, x 2 

 Pebble of group 6 



Cyphaspis matutina sp. nov. 

 p. 62 



5 Dorsal view of the cranidium of a very young specimen, x 10 



6 Lateral view of same, x 10 



7 Cranidium of an older (mature?) gpeciuien, x 5 

 Pebbles of group 5 



Cyphaspis hudsoniea sp. nov. 

 p. 64 



8 The only cranidium found, which is slightly flattened or 



crushed, and the occipital ring missing, x 4 



9 Lateral view of same, x 4 



From the upper Utica shale of Green Island 



Bronteus lunatus Billings 

 p. 65 



10 Small cephalon. x 3 

 From pebble of group 5 



11 Copy of Billings's original drawing of this form 

 Trenton limestone, Ottawa, Canada. 



Cybele sp. 

 p. 66 



12 Anterior part of a pygidium from a gutta-percha impression. 



x 5 

 Pebble of group 7 



