BATHI Unit, (sp.i, 1 s 



With tin- aid nf ;i MM'ie- of -pecinien-. from High Itiidge. Kent uck\ . and hunleith. 

 Illinois, it has I complete in a measure OUT knowledge nftlii- -| 



Tin' original was an imperfect craiiidmm .-howinu' i.v tubercled. ovoid glabella 



lii.'htly broade-f anteriorly, ainl ;i \\ide occipital rin^r produced axially int<i a spine. 



: II. 



<[)t>ciiiieiis in lian-l liavt- tin- -arne characters, and the following alilitional 



In spite of the coarse and closely set tubercles, covering 



tin- upper Mirfare of the gl, '\vn pairs of lateral grooves are -li-ccrnible. Hotli 



are short, the tir>t ln-in^ tran- M.- -ccoii'l ilin-cti-1 liackwanl. The glahellar 



all iiiilistinrt, tlit> frontal lobe ci>Vfring fully one-half of the ghibella. The 

 al bonier i- nam>w. but broader than in /'. fXfolU, eon. ,ut the glabella, 



and turned up at the edge. The palpebral lobes are moderately large, approximate 

 and posterior. The cwripital ring is tulien-led and it< central spino aliout one-third 

 the length of the glabella. 



Associated with these cranidia, in both the localities mentioned, are pygidia. 

 entire on tho margin, and having the general form of B. rxtans, but more highly 

 on nig unite abrupt. The axis extends to the narrow, 



uiiMve margin where it ends abruptly. It bears three di-tinct annulat 

 with traces of a fourth and tifth. The tirst of these has a small median, spinou- 

 tuln'irle: on tlie second the tubercle is not so large; on the third it is again more 



I'iciiuu-. ( 'lo-e behind this lies the base of a strong, erect or slightly recurved 

 -pine, and with it. in -ome of tin- specimi'ii-. the spinule on the third annulation is 

 merg'-i. Then ill tubercles on each side of the axis. Thepleur.i- 



bear four t! which il 



Pigs. 39, 40. r\k'l<liuin "f Hathgvru* . nuUirn- jin.:: liable site 



of axial i 



lofion an'/ I'-' ' 



part 



111.. i e*- 'i thi>M- '. 



