186 POTTSVILLE FAUNA OF OHIO 



Genus Spiriferina D'Orbigny 

 Spiriferina kentuckyensis (Shumard) 



1852 Spirifer octoplicata ? Hall, Stansb. Exped. to Gt. Salt Lake, p. 409, PI. 4, 



Figs. 4 a, b. 



Carboniferous: Missouri River, near Weston. 

 1855 Spirifer Kentuckyensis. Shumard, Geol. Rep. Mo., p. 203. 



Coal Measures: On the Missouri River near Weston, and Grayson County, 



Kentucky. 



Description. This species is common in the Lower Mercer lime- 

 stone and also in the higher members of the Pottsville formation but 

 is rare in the lower horizons. It shows considerable variation in size 

 and shape as well as in the length of the hinge line and the number of 

 plications present. A number of small individuals from the Harrison 

 and Sharon ores, all of which are in an imperfect state of preservation, 

 have been referred rather doubtfully to this species. The surface is 

 finely punctate and is covered with concentric lamellae, while five 

 plications are present on either side of the fold and sinus. The forms 

 from the marine limestones can easily be recognized by the long, ex- 

 tended hinge line, by the prominent fold and sinus, marked centrally 

 by a small furrow and plication respectively, and by the numerous 

 regular concentric lines covering the surface. Eight to ten plications 

 mark the area on either side of the fold and sinus. 



Dimensions. A specimen of average size from the Harrison ore 

 measures: length 7 mm., width 11 mm., convexity of the ventral valve 

 4 mm.; one of average size from the Lower Mercer limestone: length 

 9 mm., width 18.5 mm., convexity of the ventral valve 6 mm. 



Horizon and locality. Harrison ore: Jackson County, Locality 

 1, c. Sharon ore: Scioto County, Locality 2, c. Lowellville member: 

 widely distributed, c. Generally distributed in the Lower Mercer, 

 Upper Mercer, and McArthur members, c. Lower Mercer ore: Jack- 

 son County, Locality 56, r. 



Genus Spirifer Sowerby 



Spirifer boonensis Swallow? 

 PL IX, figs. 21-25 



1860 Spirifer boonensis. Swallow, Trans. St. Louis Acad. Sci., Vol. 1, p. 646. 



Lower Coal Measures: Boone, Randolph, and Monroe Counties, Missouri. 

 1903 Spirifer boonensis ? Girty, Prof. Paper, U. S. Geol. Surv., No. 16, p. 381, PI. 6, 



Figs. 1-3. 



Carboniferous: Colorado. 



