192 
Kirtley F. Mather 
the bases of tiny, close-set spines whose scars appear in some 
individuals as radiating striae interrupted at the margin of 
each concentric band ; toward the margins the concentric mark- 
ings may occasionally become more strongly elevated; in some 
individuals, especially toward the margins, apparently continu- 
ous, radiating striae, spaced 7 or 8 in 5 mm., are present though 
ordinarily quite inconspicuous. 
Internally there is no median septum in either valve. 
Re^narks. In comparison with S. perplexa, this species is 
characterized by its large size and strongly transverse outline. 
Certain European shells identified as S. lineata are nearly or 
quite as large as this form but are about as long as wide. 
Horizon and locality. Hale formation: East Mountain, Fay- 
etteville, Arkansas (Station 149). 
SUESSIID^ 
Genus SPIRIFERINA D'Orbigny 
Spiriferina trans versa (McChesney) 
Plate XIII, figures 7, 8. 
1860. Spirifer transversa. McChesney, Desc. New Pal. Foss., p. 42. 
Kaskaskia limestone: Buzzard’s Roost, Alabama. 
1865. Spirifer transversa. McChesney, 111. New Spec. Foss., pi. 6, figs. 
3a-c. 
1868. Spinfer transversa. McChesney, Trans. Chicago Acad. Sci., vol. 1, 
p. 34, pi. 6, figs. 3a-c. 
Chester limestone: Buzzard’s Roost, Alabama. 
1874. Spiriferina transversa. Derby, Bull. Cornell Univ., (Sci.), vol. 1, 
No. 2, p. 21, pi. 2, figs. 4-6, 13; pi. 3, figs. 12-14, 17; pi. 5, fig. 4. 
Coal Measures: Bomjardim and Itaituba, Brazil. 
1883. Spirifera transversa. Hall, Rep. N. Y. State Geol., for 1882, pi. 
(35) 60, figs. 18-25. 
Chester group: Buzzard’s Roost, Alabama. 
Carboniferous: Brazil, South America. 
1894. Spiriferina transversa. Hall and Clarke, Int. to Study of Brach., 
pt. 2, pi. 31, figs. 1-3. 
Chester limestone: Buzzard’s Roost, Alabama. 
Carboniferous limestone : Itaituba, Brazil. 
1895. Spirifef'ina transversa. Hall and Clarke, Pal. N. Y., vol. 8, pt. 2, 
pi. 35, figs. 19, 20, 23-25. 
Chester limestone: Buzzard’s Roost, Alabama. 
Carboniferous limestone: Itaituba, Brazil. 
