210 NEW YORK STATE MUSEUM 



PLATE 3 



(All originals in state museum) 

 Ampyx (Lonchodomas) hastatus sp. nov. 



p. 48 



Fig. 



1 Pebble with cranidium of this species and stipe of Olima- 



c o g r a p t u s scharenbergi. x 2 



2 Oranidium of mature, specimen viewed obliquely to show the 



glabella, x 2 • 



3 Dorsal view of same, x 2 



4 Lateral view of same, x 2 



5 Oranidium of a younger specimen, x 3 



6 Oranidium of the youngest specimen observed, x 2 



7 Oast of the posterior part of the glabella showing two trans- 



verse, elliptic projections 

 8, 9 Two specimens retaining part of the rostrum, which in both 

 ist bent upward and in the latter also backward, x 2 



10 Pygidium of a small specimen showing a pronounced median 



protuberance of the axis, x 5 

 30 Fragments of a partly decorticated pygidlium showing the 

 muscular impressions, x 5 

 Pebbles of groups 5 and 6 



Tretaspis diademata sp. nov. 

 p. 46 



12 Frontal view of cranidium. x 2 



13 Dorsal view of same; posterior parts of glabella and cheeks 



not as well preserved as indicated by the drawing, x 2 



14 Lateral view of same, x 2 

 Pebble of group 5 



Tretaspis reticulata sp. nov. 



p. 41 



11 Pygidum. x 3 



15 Cranidium of an adolescent specimen, showing the eye-lines, 



eye-tubercle and tubercle and crest on glabella, x 3 



