NATURAL SCIENCES OF PHILADELPHIA. 159 



DESCRIPTIONS OF NEW SPECIES OF FOSSILS FEOM OHIO AND OTHER 

 WESTERN STATES AND TERRITORIES. 



BY F. B. MEEK. 



The Ohio fossils described in this paper are a part of the col- 

 lections of the Geological Survey of that State, now being prose- 

 cuted under the direction of Dr. J. S. Newberry. Full descrip- 

 tions and illustrations of these will appear in the reports of this 

 Survey. Those from Illinois will likewise be illustrated and 

 described in the reports of the Survey of that State. For the 

 latter I am under obligations to Mr. William Gurley and Dr. 

 Winslow, of Danville, Illinois. 



The Melantho and Vivijjarus, described at the end of the paper, 

 belong to collections brought by Dr. Hayden from Wyoming 

 Territory, and were accidentally omitted in my preliminarj^ paper 

 recently published in Dr. Hayden's report. They will be figured 

 along with the others in his final report. 



OHIO COLLECTIOXS. 



FENESTELLA DELICATA, Meek. 



Growing in flat flabelliform, very finely reticulated expansions; 

 branches ver}^ slender, rigid, bifurcating, and often nearly parallel, 

 or gradually diverging to give room for new ones formed by divi- 

 sion ; dissepiments about half as thick as the branches, alternat- 

 ing or opposite, and but little expanded at their ends as seen on 

 the non-poriferous side ; fenestrules very uniform, oblong, with 

 length usuallj' about one-third to one-half greater than their 

 breadth ; non-poriferous side roughened by little granules ; pori- 

 ferous side with a row of little pointed elevations along a more 

 or less defined mesial ridge of each branch, pores comparatively 

 large, alternating and numbering two, or occasionally three, in 

 each row opposite each fenestrule, and one generally exactly at 

 each end of each dissepiment. 



Size of entire polyzoum unknown, but it apparently attains a 

 length of three inches or more ; number of fenestrules in 0.20 

 inch, measuring longitudinally, three; ditto, measuring trans- 

 versely'-, four. 

 1811.] 



