FOSSILS OF THE COAL M EAST RES. (J15 



flattened sides. Lateral lobes convex, but distinctly !<-- 

 so than the mesial lobe, hori/ontally flattened near the 

 latter, Avith an angle along the outer margin of the flat- 

 tened space, from which the sides slope abruptly to the 

 flattened, smooth border; segments six, simple, geniculated 

 or bent down in the middle very distinctly, but terminat- 

 ing abruptly at the rather wide border; each with a minute 

 pustule on the knee. Surface of glabella and all the seg- 

 ments more or less granular, the granules being larger on 

 the posterior part of the glabella and neck segment than 

 elsewhere. 



Entire length, 0.60 inch; length of pygidium, 0.19 inch; 

 breadth of do., 0.27 inch; length of thorax, 0.18 inch; 

 breadth of do., 0.28 inch; length of cephalic shield, 0.23 

 inch; breadth of do., 0.32 inch. 



Locality and position I'pper part of Coal Measures, at Springfield, 

 Illinois. 



rmLLIl'SLA (CilUFFITHIDES?) SANGAMONENSIS, M. aild W 



PL 32, Fig. 4. 



1'ltHHjixii (tii-ijfitl - MEF.K and WOKTHEX, 1*63. Proceed. Acad. Xat. Sci.. Phila., 



p.*n. 



KSTIIM-: outline elongate sub-ovate. Cephalic shield very 

 convex, forming more than a semicircle, and about one- 

 third wider than long; regularly rounded in front and 

 straight behind, with posterior lateral angles produced into 

 rather broad, carinated, pointed or sub-spinous appendages, 

 equaling in length the distance from the posterior side 

 of the cheeks to the anterior end of the eyes. Glabella 

 ventricose, very prominent, separated from the cheeks on 

 each side by a moderately distinct furrow, which also passes 

 around the front; most convex behind the middle, thence 

 rounded and declining to the rounded front, about one- 

 fourth longer than wide, and slightly wider between the 

 eyes than anteriorly; sides nearly parallel, but a little sinu- 

 ous at the middle; posterior lateral lobes comparatively 



