274 PALAEONTOLOGY OF OHIO. 



little nodes or projecting points along the mesial ridge of this side of the 

 branches in our species do not exist in F. plebeja, nor does the latter 

 usually have a pore opposite each end of each dissepiment, as in the 

 species under consideration. 



Locality and jMsiiion : Lodi, Ohio. Waverlj' group of Lower Carboniferous. 



Fenestella multipoeata? var. Lodiensis. 



Plate 10, figs, la, b, c. 

 Fenestella multiporata, McCoy (1844) ; Synop. Carb. Foss. Ireland, p. 203, pi. 28, fig. 9. 



Polyzoum flabelliform ; stems slender, bifurcating, sometimes straight, 

 and running nearly parallel to each other, but in other examples curv- 

 ing laterally to make room for new divisions, or somewhat flexuous ; dis- 

 sepiments very slender or scarcely half as thick as the stems, and very 

 little or not at all expanded at the ends ; fenestrules two or three times 

 . as long as wide, and not rounded at the ends ; pores situated on little 

 prominences, and alternately arranged so that from five to seven of them 

 may be counted on each side of a stem opposite each fenestrule; mesial 

 ridge between the rows of .pores very small or apparently sometimes ob- 

 solete, occasionally with little prominences about twice as distant from 

 each other as those bearing the pores; non- poriferous side of the stems 

 rounded, or sometimes sub-angular, and minutely striated longitudin- 

 ally. 



Entire size of polyzoum unknown, but apparently sometimes not less 



than four or five inches in diameter. Fenestrules 7 to 9 in 0.20 inch, 



measuring transversely, and about 2 to 3 in the same space, measuring 



longitudinally ; number of pores in same space on each side of a stem, 



16 to 17. 



This fossil agrees so exactly in the size of its branches, dissepiments 

 and fenestrules, and so nearly in the nature and arrangement of its pores, 

 with F. multiporata of McCoy, that I am inclined to believe it may possi- 

 bly be a variety of the same species. The only differences I can see are, 

 that it seems to be nearly destitute of the mesial carina so well developed 

 along the poriferous side of the branches in Prof. McCoy's species, and 

 the somewhat greater obliquity and prominence of its pores, which also 

 usually number one or two less on each side, opposite each fenestrule, 

 than in F. multiporata. It likewise shows some appearances of little 

 nodes along the middle of the poriferous side of the branches not repre- 

 sented in the latter. It is probably a distinct species, but I j)refer to 



