212 NEW YORK STATE MUSEUM 



PLATE 4 



(All origiunls iu state uiuseum unless otherwise stated) 



Isotelus cf. maximus Ijocke 

 p. 59 



Fig. 



1 Pygidium of a very youngs example partly decorticated and 

 showing muscular impressions, x 5 

 Pebble of gi-oup 7 



Remopleurides tumidus sp. nov. 

 p. 54 

 3 Dorsal view of cranidium. x 2 



3 Frontal vie^^ of same, x 2 



4 Lateral view" of same, x 2 

 Pebble of group 6 



Cyphaspis matutina sp. nov. 

 p. 62 



5 Dorsal ^-iew of the cranidium of a very young specimen, x 10 



6 Lateral view of same, x 10 



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

 Pebbles of group 5 



Cyphaspis hudsonica sp. nov. 

 p. 64 



8 The only cranidium found, which is slightly flattened or 



crushed, and the occipital ring missing, x 4 



9 Latei-al yiew 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 pyfridinin from a gutta-7>ercha impression. 



X 5 

 Pebble of group 7 



