210 NEW YORK STATE MUSEUM 



PLATE 3 



(All originals in stale museum) 



Ampyx (Lonchodomas) hastatus sp. nov, 



p. 48 



Fig. 



1 lVl»blt* with cianidium of this species and stipe of C 1 i m a - 



c o jj; r a p t u s s c h a r e n b e r g i . x 2 



2 Cranidiuiii of mature. si>ecimen viewed obliquely to show tlie 



glabella, x 2 



3 Doi*sal view of same, x 2 



4 Lateral view of same, x 2 



5 Cranidium of a younger specimen, x 3 



6 Oranidium of the youngest specimen observed, x 2 



7 Cast of the j>osterior ixirt of the glabella showing two trans- 



verse, elliptic projections 

 8, 9 Two specimens i-etaining part of the rostrum, which in both 

 is bent upward and in the latter also backw^ard. x 2 



10 Pygidium of a small specimen showing a pronounced median 



protuberance of the axis, x 5 

 30 Fragments of a x>artly de«eorticated pygidium showing the 

 muscular impressions, x 5 

 Pebbles of groups 5 and fi 



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 I^ateral view of «iTne. 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-linos, 



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



