118 PALEOZOIC PALEONTOLOGY. 
PTYCHOPARIA? sp. undet. 
Plate III., Fig. 13. 
A single specimen from Newton, which is different from any of the 
others in the collection, but is too imperfect for identification, may be 
provisionally referred to the genus Ptychoparia. 
The glabella is subelliptical in outline; glabellar furrows obsolete ; 
occipital furrow well defined; axial portion of occipital segment 
narrower than the width of the glabella in front. Fixed cheeks imper- 
fectly preserved, rather broad behind, becoming narrower anteriorly, 
and passing into the frontal limb; palpebral lobes small, apparently 
placed nearly opposite the anterior end of the glabella. Fixed cheeks, 
thorax and pygidium unknown. 
The approximate dimensions of the specimen are: length, 3.5 
mm.; width, 5 mm. 
PTYCHOPARIA sp. undet. 
Plate IIL. Fig. 9. 
This specimen from Newton cannot be identified with any of the 
described species of the genus Ptychoparia, to which it apparently 
belongs, but it is altogether too imperfectly preserved to be used as 
the type of a new species. 
The approximate dimensions of the specimen are: length, 8.5 
mm.; width, 13 mm. 
AGRAULOS SARATOGENSIS Walcott. 
Plate I., Figs. 7-9. 
1890. Agraulos saratogensis Walcott, Proc. U. 8. Nat. Mus., vol. 
XE. p. 276, pli, tie. 14. 
Description.—Head convex, nearly semi-circular in outline. ‘The 
cranidium irregularly, subpentagonal in outline, narrowest in front. 
Glabella moderately convex, longer than wide, the sides converging 
slightly towards the broadly-rounded anterior; surface smooth, not 
marked by lateral furrows; occipital furrow moderately well defined, 
