382 The Ohio Journal of Science [Vol. XIX, No. 7, 



growth, some of which tend to become conspicuous, although on some 

 of the specimens the lines of growth are inconspicuous over the middle 

 and posterior parts of the shell. About 6 plications occupy a width of 

 5 millimeters. 



Spirif er niagarensis (Conrad) . 

 Plate XVI, Figs. 7 A, B. 



Spirifer niagarensis Hall, Pal. New York, 1852, pi. 54, figs. 5 a-t. 

 Spirifer repertus Foerste, Cincinnati Soc. Nat. Hist. Jour., vol. 21, 1909, p. 10, 

 pi. 1, figs. 14 A, B:pl. 2, fig. 5. 



Spirifer repertus was described from the lower part of the 

 West Union formation, at Harin Hill, about eight miles south- 

 west of Vanceburg, in Lewis county, Kentucky. Larger 

 specimens of apparently the same species, obtained from the 

 Whitfieldella horizon, in the Lower or Bisher member of the 

 West Union formation, about nine feet above the base of the 

 latter, do not appear to diflFer from typical specimens of Spirifer 

 niagarensis, as found in the Rochester shale of New York. In 

 Indiana, this species occurs in the Osgood formation. 



Whitfieldella cylindrica (Hall). 



Plate XVI, Figs. 6 A-C. 



1852. Atrypa cylindrica Hall, Pal. New York, vol. 2, p. 76. pi. 24, figs. 2 a-h. 

 1873. Meristella {?Merisiina) cylindrica Meek, Pal. Ohio, vol. 1, p. 180, pi. 15, 



figs. 2 a-d. 

 1893. Whitfieldella cylindrica Hall and Clarke, vol. 8, pt. 2, p. 60. pi. 40, figs. 16-22, 



Whitfieldella cylindrica was described from the Irondequoit 

 limestone which forms an upper member of the Clinton forma- 

 tion of New York. About nine feet above the base of the 

 Lower or Bisher member of the West Union formation, in the 

 vicinity of Hillsboro and Danville, Ohio, a form occurs which 

 evidently is closely related, but which attains a larger size, 

 frequently equalling 35 millimeters. 



Specimens from the West Union formation which are no larger 

 than those from the Irondequoit limestone agree with the latter in 

 general appearance, but specimens which are larger than the latter tend 

 to be more distinctly flattened along the anterior half of the pedicel 

 valve. In specimens from both horizons there is a tendency toward 

 a narrow median line of depression along the anterior half or two- 

 thirds of this valve. Corresponding to the broad flattening of the 

 pedicel valve there is a broad, but slight increase in convexity of the 

 median parts of the brachial valve anteriorly in many of the specimens 

 from the West Union formation. Some of the specimens from the 

 Hillsboro and Danville areas are strongly flattened laterally, especially 

 posteriorly, this flattening attracts most attention when the shell is 



