324 PALEONTOLOGY OF OHIO. 



teen segments, each one of which bears five little nodes arranged so as 

 to form five rows, those of the middle row being larger and more promi- 

 nent than the others, and thus giving the lobe a carinated appearance; 

 lateral lobes somewhat flattened above for about half their breadth, at 

 which point they bend suddenly downward for a short distance, and then 

 obliquely outward to form a rather broad, sloping border, each provided 

 with seven to nine segments, the posterior of which arj very obscure 

 and directed nearly backward, the segments each bearing two or three 

 little nodes arranged so as to form as many longitudinal rows, and all 

 continued down upon and across the sloping border, at the edge of which 

 they terminate in little pointed projections so as to present a fimbriated 

 apj)earance around the posterior and lateral edges. (This latter charac- 

 ter is not represented in the figure.) 



Length, 0.49 inch; breadth, 0.28 inch; length of cephalic shield, 0.20 

 inch ; do. of a pygidium of another specimen from Loudonville, in a fer- 

 ruginous matrix, 0.23 inch in length by 0.30 in breadth, with a height 

 (of mesial lobe) of 0.10 inch. 



As the only specimen of this species showing the entire fossil has the 

 head somewhat crushed, it is possible that it may be necessary to modify 

 the description of that part in some of the details when perfect specimens 

 can be examined. This condition of the cephalic shield also renders the 

 generic characters somewhat obscure. The apparently smooth eyes and 

 glabella, without visible lateral furrows, would seem to indicate relations 

 to Griffithides, though the form of the glabella is more like that of Fhil- 

 lipsia. The fimbriated character of the posterior and lateral margins of 

 the pygidium, however, is very peculiar and hitherto unknown, I believe, 

 in either of the above mentioned genera, though it occurs in one section 

 {Phseton) of the allied genus Froetus ; hence it is possible our sj)ecies 

 should be called Proetus (^Phseton) Lodiensis^ as it would not be very sur- 

 prising that this genus should be here found in this oldest member of 

 the Carboniferous, though hitherto, I believe, only known in the Silurian 

 and Devonian. 



Specifically the head of this trilobite resembles Phillipsia McOoyi of 

 Portlock, more nearly than any other known to me, particularly in its 

 coarsely tuberculated surface, with a row of tubercles arranged around 

 the anterior and lateral margins, as well as in the oval form of its gla- 

 bella. Its eyes, however, are proportionally smaller, its occipital ridge 

 much more strongly developed and wider, while the tubercles of its mar- 

 ginal row are not nearly so crowded as in Portlock's species. 



So far as can be determined from a description alone, the form under 



